From commits-return-4624-archive-asf-public=cust-asf.ponee.io@celix.apache.org Wed Jan 31 21:05:29 2018 Return-Path: X-Original-To: archive-asf-public@eu.ponee.io Delivered-To: archive-asf-public@eu.ponee.io Received: from cust-asf.ponee.io (cust-asf.ponee.io [163.172.22.183]) by mx-eu-01.ponee.io (Postfix) with ESMTP id 8A64518067A for ; Wed, 31 Jan 2018 21:05:29 +0100 (CET) Received: by cust-asf.ponee.io (Postfix) id 74A34160C42; Wed, 31 Jan 2018 20:05:29 +0000 (UTC) Delivered-To: archive-asf-public@cust-asf.ponee.io Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by cust-asf.ponee.io (Postfix) with SMTP id 50531160C57 for ; Wed, 31 Jan 2018 21:05:27 +0100 (CET) Received: (qmail 36257 invoked by uid 500); 31 Jan 2018 20:05:26 -0000 Mailing-List: contact commits-help@celix.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: dev@celix.apache.org Delivered-To: mailing list commits@celix.apache.org Received: (qmail 36223 invoked by uid 99); 31 Jan 2018 20:05:26 -0000 Received: from git1-us-west.apache.org (HELO git1-us-west.apache.org) (140.211.11.23) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 31 Jan 2018 20:05:26 +0000 Received: by git1-us-west.apache.org (ASF Mail Server at git1-us-west.apache.org, from userid 33) id 750DAF1727; Wed, 31 Jan 2018 20:05:25 +0000 (UTC) Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit From: pnoltes@apache.org To: commits@celix.apache.org Date: Wed, 31 Jan 2018 20:05:30 -0000 Message-Id: In-Reply-To: <258321dfc0644cc38fece51b238b9c43@git.apache.org> References: <258321dfc0644cc38fece51b238b9c43@git.apache.org> X-Mailer: ASF-Git Admin Mailer Subject: [6/8] celix git commit: CELIX-413: Moves the example to an additional dir, so that examples can also be build outside the celix project http://git-wip-us.apache.org/repos/asf/celix/blob/a8b8410f/examples/celix-examples/mongoose/private/src/mongoose.c ---------------------------------------------------------------------- diff --git a/examples/celix-examples/mongoose/private/src/mongoose.c b/examples/celix-examples/mongoose/private/src/mongoose.c new file mode 100644 index 0000000..1a1f87c --- /dev/null +++ b/examples/celix-examples/mongoose/private/src/mongoose.c @@ -0,0 +1,4076 @@ +// Copyright (c) 2004-2010 Sergey Lyubka +// +// Permission is hereby granted, free of charge, to any person obtaining a copy +// of this software and associated documentation files (the "Software"), to deal +// in the Software without restriction, including without limitation the rights +// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +// copies of the Software, and to permit persons to whom the Software is +// furnished to do so, subject to the following conditions: +// +// The above copyright notice and this permission notice shall be included in +// all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +// THE SOFTWARE. + +#if defined(_WIN32) +#define _CRT_SECURE_NO_WARNINGS // Disable deprecation warning in VS2005 +#else +#define _XOPEN_SOURCE 600 // For flockfile() on Linux +#define _LARGEFILE_SOURCE // Enable 64-bit file offsets +#endif + +#ifndef _WIN32_WCE // Some ANSI #includes are not available on Windows CE +#include +#include +#include +#include +#include +#endif // !_WIN32_WCE + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#if defined(_WIN32) // Windows specific #includes and #defines +#define _WIN32_WINNT 0x0400 // To make it link in VS2005 +#include + +#ifndef PATH_MAX +#define PATH_MAX MAX_PATH +#endif + +#ifndef _WIN32_WCE +#include +#include +#include +#else // _WIN32_WCE +#include +#define NO_CGI // WinCE has no pipes + +typedef long off_t; +#define BUFSIZ 4096 + +#define errno GetLastError() +#define strerror(x) _ultoa(x, (char *) _alloca(sizeof(x) *3 ), 10) +#endif // _WIN32_WCE + +#define MAKEUQUAD(lo, hi) ((uint64_t)(((uint32_t)(lo)) | \ + ((uint64_t)((uint32_t)(hi))) << 32)) +#define RATE_DIFF 10000000 // 100 nsecs +#define EPOCH_DIFF MAKEUQUAD(0xd53e8000, 0x019db1de) +#define SYS2UNIX_TIME(lo, hi) \ + (time_t) ((MAKEUQUAD((lo), (hi)) - EPOCH_DIFF) / RATE_DIFF) + +// Visual Studio 6 does not know __func__ or __FUNCTION__ +// The rest of MS compilers use __FUNCTION__, not C99 __func__ +// Also use _strtoui64 on modern M$ compilers +#if defined(_MSC_VER) && _MSC_VER < 1300 +#define STRX(x) #x +#define STR(x) STRX(x) +#define __func__ "line " STR(__LINE__) +#define strtoull(x, y, z) strtoul(x, y, z) +#define strtoll(x, y, z) strtol(x, y, z) +#else +#define __func__ __FUNCTION__ +#define strtoull(x, y, z) _strtoui64(x, y, z) +#define strtoll(x, y, z) _strtoi64(x, y, z) +#endif // _MSC_VER + +#define ERRNO GetLastError() +#define NO_SOCKLEN_T +#define SSL_LIB "ssleay32.dll" +#define CRYPTO_LIB "libeay32.dll" +#define DIRSEP '\\' +#define IS_DIRSEP_CHAR(c) ((c) == '/' || (c) == '\\') +#define O_NONBLOCK 0 +#if !defined(EWOULDBLOCK) +#define EWOULDBLOCK WSAEWOULDBLOCK +#endif // !EWOULDBLOCK +#define _POSIX_ +#define INT64_FMT "I64d" + +#define WINCDECL __cdecl +#define SHUT_WR 1 +#define snprintf _snprintf +#define vsnprintf _vsnprintf +#define sleep(x) Sleep((x) * 1000) + +#define pipe(x) _pipe(x, BUFSIZ, _O_BINARY) +#define popen(x, y) _popen(x, y) +#define pclose(x) _pclose(x) +#define close(x) _close(x) +#define dlsym(x,y) GetProcAddress((HINSTANCE) (x), (y)) +#define RTLD_LAZY 0 +#define fseeko(x, y, z) fseek((x), (y), (z)) +#define fdopen(x, y) _fdopen((x), (y)) +#define write(x, y, z) _write((x), (y), (unsigned) z) +#define read(x, y, z) _read((x), (y), (unsigned) z) +#define flockfile(x) (void) 0 +#define funlockfile(x) (void) 0 + +#if !defined(fileno) +#define fileno(x) _fileno(x) +#endif // !fileno MINGW #defines fileno + +typedef HANDLE pthread_mutex_t; +typedef struct {HANDLE signal, broadcast;} pthread_cond_t; +typedef DWORD pthread_t; +#define pid_t HANDLE // MINGW typedefs pid_t to int. Using #define here. + +struct timespec { + long tv_nsec; + long tv_sec; +}; + +static int pthread_mutex_lock(pthread_mutex_t *); +static int pthread_mutex_unlock(pthread_mutex_t *); +static FILE *mg_fopen(const char *path, const char *mode); + +#if defined(HAVE_STDINT) +#include +#else +typedef unsigned int uint32_t; +typedef unsigned short uint16_t; +typedef unsigned __int64 uint64_t; +typedef __int64 int64_t; +#define INT64_MAX 9223372036854775807 +#endif // HAVE_STDINT + +// POSIX dirent interface +struct dirent { + char d_name[PATH_MAX]; +}; + +typedef struct DIR { + HANDLE handle; + WIN32_FIND_DATAW info; + struct dirent result; +} DIR; + +#else // UNIX specific + +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#if defined(__MACH__) +#define SSL_LIB "libssl.dylib" +#define CRYPTO_LIB "libcrypto.dylib" +#else +#define SSL_LIB "libssl.so" +#define CRYPTO_LIB "libcrypto.so" +#endif +#define DIRSEP '/' +#define IS_DIRSEP_CHAR(c) ((c) == '/') +#define O_BINARY 0 +#define closesocket(a) close(a) +#define mg_fopen(x, y) fopen(x, y) +#define mg_mkdir(x, y) mkdir(x, y) +#define mg_remove(x) remove(x) +#define mg_rename(x, y) rename(x, y) +#define ERRNO errno +#define INVALID_SOCKET (-1) +#define INT64_FMT PRId64 +typedef int SOCKET; +#define WINCDECL + +#endif // End of Windows and UNIX specific includes + +#include "mongoose.h" + +#define MONGOOSE_VERSION "2.11" +#define PASSWORDS_FILE_NAME ".htpasswd" +#define CGI_ENVIRONMENT_SIZE 4096 +#define MAX_CGI_ENVIR_VARS 64 +#define ARRAY_SIZE(array) (sizeof(array) / sizeof(array[0])) + +#if defined(DEBUG) +#define DEBUG_TRACE(x) do { \ + flockfile(stdout); \ + printf("*** %lu.%p.%s.%d: ", \ + (unsigned long) time(NULL), (void *) pthread_self(), \ + __func__, __LINE__); \ + printf x; \ + putchar('\n'); \ + fflush(stdout); \ + funlockfile(stdout); \ +} while (0) +#else +#define DEBUG_TRACE(x) +#endif // DEBUG + +// Darwin prior to 7.0 and Win32 do not have socklen_t +#ifdef NO_SOCKLEN_T +typedef int socklen_t; +#endif // NO_SOCKLEN_T + +typedef void * (*mg_thread_func_pt)(void *); + +static const char *http_500_error = "Internal Server Error"; + +// Snatched from OpenSSL includes. I put the prototypes here to be independent +// from the OpenSSL source installation. Having this, mongoose + SSL can be +// built on any system with binary SSL libraries installed. +typedef struct ssl_st SSL; +typedef struct ssl_method_st SSL_METHOD; +typedef struct ssl_ctx_st SSL_CTX; + +#define SSL_ERROR_WANT_READ 2 +#define SSL_ERROR_WANT_WRITE 3 +#define SSL_FILETYPE_PEM 1 +#define CRYPTO_LOCK 1 + +#if defined(NO_SSL_DL) +extern void SSL_free(SSL *); +extern int SSL_accept(SSL *); +extern int SSL_connect(SSL *); +extern int SSL_read(SSL *, void *, int); +extern int SSL_write(SSL *, const void *, int); +extern int SSL_get_error(const SSL *, int); +extern int SSL_set_fd(SSL *, int); +extern SSL *SSL_new(SSL_CTX *); +extern SSL_CTX *SSL_CTX_new(SSL_METHOD *); +extern SSL_METHOD *SSLv23_server_method(void); +extern int SSL_library_init(void); +extern void SSL_load_error_strings(void); +extern int SSL_CTX_use_PrivateKey_file(SSL_CTX *, const char *, int); +extern int SSL_CTX_use_certificate_file(SSL_CTX *, const char *, int); +extern int SSL_CTX_use_certificate_chain_file(SSL_CTX *, const char *); +extern void SSL_CTX_set_default_passwd_cb(SSL_CTX *, mg_callback_pt); +extern void SSL_CTX_free(SSL_CTX *); +extern unsigned long ERR_get_error(void); +extern char *ERR_error_string(unsigned long, char *); +extern int CRYPTO_num_locks(void); +extern void CRYPTO_set_locking_callback(void (*)(int, int, const char *, int)); +extern void CRYPTO_set_id_callback(unsigned long (*)(void)); +#else +// Dynamically loaded SSL functionality +struct ssl_func { + const char *name; // SSL function name + void (*ptr)(void); // Function pointer +}; + +#define SSL_free (* (void (*)(SSL *)) ssl_sw[0].ptr) +#define SSL_accept (* (int (*)(SSL *)) ssl_sw[1].ptr) +#define SSL_connect (* (int (*)(SSL *)) ssl_sw[2].ptr) +#define SSL_read (* (int (*)(SSL *, void *, int)) ssl_sw[3].ptr) +#define SSL_write (* (int (*)(SSL *, const void *,int)) ssl_sw[4].ptr) +#define SSL_get_error (* (int (*)(SSL *, int)) ssl_sw[5]) +#define SSL_set_fd (* (int (*)(SSL *, SOCKET)) ssl_sw[6].ptr) +#define SSL_new (* (SSL * (*)(SSL_CTX *)) ssl_sw[7].ptr) +#define SSL_CTX_new (* (SSL_CTX * (*)(SSL_METHOD *)) ssl_sw[8].ptr) +#define SSLv23_server_method (* (SSL_METHOD * (*)(void)) ssl_sw[9].ptr) +#define SSL_library_init (* (int (*)(void)) ssl_sw[10].ptr) +#define SSL_CTX_use_PrivateKey_file (* (int (*)(SSL_CTX *, \ + const char *, int)) ssl_sw[11].ptr) +#define SSL_CTX_use_certificate_file (* (int (*)(SSL_CTX *, \ + const char *, int)) ssl_sw[12].ptr) +#define SSL_CTX_set_default_passwd_cb \ + (* (void (*)(SSL_CTX *, mg_callback_pt)) ssl_sw[13].ptr) +#define SSL_CTX_free (* (void (*)(SSL_CTX *)) ssl_sw[14].ptr) +#define SSL_load_error_strings (* (void (*)(void)) ssl_sw[15].ptr) +#define SSL_CTX_use_certificate_chain_file \ + (* (int (*)(SSL_CTX *, const char *)) ssl_sw[16].ptr) + +#define CRYPTO_num_locks (* (int (*)(void)) crypto_sw[0].ptr) +#define CRYPTO_set_locking_callback \ + (* (void (*)(void (*)(int, int, const char *, int))) crypto_sw[1].ptr) +#define CRYPTO_set_id_callback \ + (* (void (*)(unsigned long (*)(void))) crypto_sw[2].ptr) +#define ERR_get_error (* (unsigned long (*)(void)) ssl_sw[3].ptr) +#define ERR_error_string (* (char * (*)(unsigned long, char *)) ssl_sw[4].ptr) + +// set_ssl_option() function updates this array. +// It loads SSL library dynamically and changes NULLs to the actual addresses +// of respective functions. The macros above (like SSL_connect()) are really +// just calling these functions indirectly via the pointer. +static struct ssl_func ssl_sw[] = { + {"SSL_free", NULL}, + {"SSL_accept", NULL}, + {"SSL_connect", NULL}, + {"SSL_read", NULL}, + {"SSL_write", NULL}, + {"SSL_get_error", NULL}, + {"SSL_set_fd", NULL}, + {"SSL_new", NULL}, + {"SSL_CTX_new", NULL}, + {"SSLv23_server_method", NULL}, + {"SSL_library_init", NULL}, + {"SSL_CTX_use_PrivateKey_file", NULL}, + {"SSL_CTX_use_certificate_file",NULL}, + {"SSL_CTX_set_default_passwd_cb",NULL}, + {"SSL_CTX_free", NULL}, + {"SSL_load_error_strings", NULL}, + {"SSL_CTX_use_certificate_chain_file", NULL}, + {NULL, NULL} +}; + +// Similar array as ssl_sw. These functions could be located in different lib. +static struct ssl_func crypto_sw[] = { + {"CRYPTO_num_locks", NULL}, + {"CRYPTO_set_locking_callback", NULL}, + {"CRYPTO_set_id_callback", NULL}, + {"ERR_get_error", NULL}, + {"ERR_error_string", NULL}, + {NULL, NULL} +}; +#endif // NO_SSL_DL + +static const char *month_names[] = { + "Jan", "Feb", "Mar", "Apr", "May", "Jun", + "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" +}; + +// Unified socket address. For IPv6 support, add IPv6 address structure +// in the union u. +struct usa { + socklen_t len; + union { + struct sockaddr sa; + struct sockaddr_in sin; + } u; +}; + +// Describes a string (chunk of memory). +struct vec { + const char *ptr; + size_t len; +}; + +// Structure used by mg_stat() function. Uses 64 bit file length. +struct mgstat { + int is_directory; // Directory marker + int64_t size; // File size + time_t mtime; // Modification time +}; + +// Describes listening socket, or socket which was accept()-ed by the master +// thread and queued for future handling by the worker thread. +struct socket { + struct socket *next; // Linkage + SOCKET sock; // Listening socket + struct usa lsa; // Local socket address + struct usa rsa; // Remote socket address + int is_ssl; // Is socket SSL-ed + int is_proxy; +}; + +enum { + CGI_EXTENSIONS, CGI_ENVIRONMENT, PUT_DELETE_PASSWORDS_FILE, CGI_INTERPRETER, + PROTECT_URI, AUTHENTICATION_DOMAIN, SSI_EXTENSIONS, ACCESS_LOG_FILE, + SSL_CHAIN_FILE, ENABLE_DIRECTORY_LISTING, ERROR_LOG_FILE, + GLOBAL_PASSWORDS_FILE, INDEX_FILES, + ENABLE_KEEP_ALIVE, ACCESS_CONTROL_LIST, MAX_REQUEST_SIZE, + EXTRA_MIME_TYPES, LISTENING_PORTS, + DOCUMENT_ROOT, SSL_CERTIFICATE, NUM_THREADS, RUN_AS_USER, + NUM_OPTIONS +}; + +static const char *config_options[] = { + "C", "cgi_extensions", ".cgi,.pl,.php", + "E", "cgi_environment", NULL, + "G", "put_delete_passwords_file", NULL, + "I", "cgi_interpreter", NULL, + "P", "protect_uri", NULL, + "R", "authentication_domain", "mydomain.com", + "S", "ssi_extensions", ".shtml,.shtm", + "a", "access_log_file", NULL, + "c", "ssl_chain_file", NULL, + "d", "enable_directory_listing", "yes", + "e", "error_log_file", NULL, + "g", "global_passwords_file", NULL, + "i", "index_files", "index.html,index.htm,index.cgi", + "k", "enable_keep_alive", "no", + "l", "access_control_list", NULL, + "M", "max_request_size", "16384", + "m", "extra_mime_types", NULL, + "p", "listening_ports", "8080", + "r", "document_root", ".", + "s", "ssl_certificate", NULL, + "t", "num_threads", "10", + "u", "run_as_user", NULL, + NULL +}; +#define ENTRIES_PER_CONFIG_OPTION 3 + +struct mg_context { + int stop_flag; // Should we stop event loop + SSL_CTX *ssl_ctx; // SSL context + char *config[NUM_OPTIONS]; // Mongoose configuration parameters + mg_callback_pt user_callback; // User-defined callback function + + struct socket *listening_sockets; + + int num_threads; // Number of threads + pthread_mutex_t mutex; // Protects (max|num)_threads + pthread_cond_t cond; // Condvar for tracking workers terminations + + struct socket queue[20]; // Accepted sockets + int sq_head; // Head of the socket queue + int sq_tail; // Tail of the socket queue + pthread_cond_t sq_full; // Singaled when socket is produced + pthread_cond_t sq_empty; // Signaled when socket is consumed +}; + +struct mg_connection { + struct mg_connection *peer; // Remote target in proxy mode + struct mg_request_info request_info; + struct mg_context *ctx; + SSL *ssl; // SSL descriptor + struct socket client; // Connected client + time_t birth_time; // Time connection was accepted + int64_t num_bytes_sent; // Total bytes sent to client + int64_t content_len; // Content-Length header value + int64_t consumed_content; // How many bytes of content is already read + char *buf; // Buffer for received data + int buf_size; // Buffer size + int request_len; // Size of the request + headers in a buffer + int data_len; // Total size of data in a buffer +}; + +const char **mg_get_valid_option_names(void) { + return config_options; +} + +static void *call_user(struct mg_connection *conn, enum mg_event event) { + return conn->ctx->user_callback == NULL ? NULL : + conn->ctx->user_callback(event, conn, &conn->request_info); +} + +static int get_option_index(const char *name) { + int i; + + for (i = 0; config_options[i] != NULL; i += ENTRIES_PER_CONFIG_OPTION) { + if (strcmp(config_options[i], name) == 0 || + strcmp(config_options[i + 1], name) == 0) { + return i / ENTRIES_PER_CONFIG_OPTION; + } + } + return -1; +} + +const char *mg_get_option(const struct mg_context *ctx, const char *name) { + int i; + if ((i = get_option_index(name)) == -1) { + return NULL; + } else if (ctx->config[i] == NULL) { + return ""; + } else { + return ctx->config[i]; + } +} + +// Print error message to the opened error log stream. +static void cry(struct mg_connection *conn, const char *fmt, ...) { + char buf[BUFSIZ]; + va_list ap; + FILE *fp; + time_t timestamp; + + va_start(ap, fmt); + (void) vsnprintf(buf, sizeof(buf), fmt, ap); + va_end(ap); + + // Do not lock when getting the callback value, here and below. + // I suppose this is fine, since function cannot disappear in the + // same way string option can. + conn->request_info.log_message = buf; + if (call_user(conn, MG_EVENT_LOG) == NULL) { + fp = conn->ctx->config[ERROR_LOG_FILE] == NULL ? NULL : + mg_fopen(conn->ctx->config[ERROR_LOG_FILE], "a+"); + + if (fp != NULL) { + flockfile(fp); + timestamp = time(NULL); + + (void) fprintf(fp, + "[%010lu] [error] [client %s] ", + (unsigned long) timestamp, + inet_ntoa(conn->client.rsa.u.sin.sin_addr)); + + if (conn->request_info.request_method != NULL) { + (void) fprintf(fp, "%s %s: ", + conn->request_info.request_method, + conn->request_info.uri); + } + + (void) fprintf(fp, "%s", buf); + fputc('\n', fp); + funlockfile(fp); + if (fp != stderr) { + fclose(fp); + } + } + } + conn->request_info.log_message = NULL; +} + +// Return OpenSSL error message +static const char *ssl_error(void) { + unsigned long err; + err = ERR_get_error(); + return err == 0 ? "" : ERR_error_string(err, NULL); +} + +// Return fake connection structure. Used for logging, if connection +// is not applicable at the moment of logging. +static struct mg_connection *fc(struct mg_context *ctx) { + static struct mg_connection fake_connection; + fake_connection.ctx = ctx; + return &fake_connection; +} + +const char *mg_version(void) { + return MONGOOSE_VERSION; +} + +static void mg_strlcpy(register char *dst, register const char *src, size_t n) { + for (; *src != '\0' && n > 1; n--) { + *dst++ = *src++; + } + *dst = '\0'; +} + +static int lowercase(const char *s) { + return tolower(* (unsigned char *) s); +} + +static int mg_strncasecmp(const char *s1, const char *s2, size_t len) { + int diff = 0; + + if (len > 0) + do { + diff = lowercase(s1++) - lowercase(s2++); + } while (diff == 0 && s1[-1] != '\0' && --len > 0); + + return diff; +} + +static int mg_strcasecmp(const char *s1, const char *s2) { + int diff; + + do { + diff = lowercase(s1++) - lowercase(s2++); + } while (diff == 0 && s1[-1] != '\0'); + + return diff; +} + +static char * mg_strndup(const char *ptr, size_t len) { + char *p; + + if ((p = (char *) malloc(len + 1)) != NULL) { + mg_strlcpy(p, ptr, len + 1); + } + + return p; +} + +static char * mg_strdup(const char *str) { + return mg_strndup(str, strlen(str)); +} + +// Like snprintf(), but never returns negative value, or the value +// that is larger than a supplied buffer. +// Thanks to Adam Zeldis to pointing snprintf()-caused vulnerability +// in his audit report. +static int mg_vsnprintf(struct mg_connection *conn, char *buf, size_t buflen, + const char *fmt, va_list ap) { + int n; + + if (buflen == 0) + return 0; + + n = vsnprintf(buf, buflen, fmt, ap); + + if (n < 0) { + cry(conn, "vsnprintf error"); + n = 0; + } else if (n >= (int) buflen) { + cry(conn, "truncating vsnprintf buffer: [%.*s]", + n > 200 ? 200 : n, buf); + n = (int) buflen - 1; + } + buf[n] = '\0'; + + return n; +} + +static int mg_snprintf(struct mg_connection *conn, char *buf, size_t buflen, + const char *fmt, ...) { + va_list ap; + int n; + + va_start(ap, fmt); + n = mg_vsnprintf(conn, buf, buflen, fmt, ap); + va_end(ap); + + return n; +} + +// Skip the characters until one of the delimiters characters found. +// 0-terminate resulting word. Skip the rest of the delimiters if any. +// Advance pointer to buffer to the next word. Return found 0-terminated word. +static char *skip(char **buf, const char *delimiters) { + char *p, *begin_word, *end_word, *end_delimiters; + + begin_word = *buf; + end_word = begin_word + strcspn(begin_word, delimiters); + end_delimiters = end_word + strspn(end_word, delimiters); + + for (p = end_word; p < end_delimiters; p++) { + *p = '\0'; + } + + *buf = end_delimiters; + + return begin_word; +} + +// Return HTTP header value, or NULL if not found. +static const char *get_header(const struct mg_request_info *ri, + const char *name) { + int i; + + for (i = 0; i < ri->num_headers; i++) + if (!mg_strcasecmp(name, ri->http_headers[i].name)) + return ri->http_headers[i].value; + + return NULL; +} + +const char *mg_get_header(const struct mg_connection *conn, const char *name) { + return get_header(&conn->request_info, name); +} + +// A helper function for traversing comma separated list of values. +// It returns a list pointer shifted to the next value, of NULL if the end +// of the list found. +// Value is stored in val vector. If value has form "x=y", then eq_val +// vector is initialized to point to the "y" part, and val vector length +// is adjusted to point only to "x". +static const char *next_option(const char *list, struct vec *val, + struct vec *eq_val) { + if (list == NULL || *list == '\0') { + /* End of the list */ + list = NULL; + } else { + val->ptr = list; + if ((list = strchr(val->ptr, ',')) != NULL) { + /* Comma found. Store length and shift the list ptr */ + val->len = list - val->ptr; + list++; + } else { + /* This value is the last one */ + list = val->ptr + strlen(val->ptr); + val->len = list - val->ptr; + } + + if (eq_val != NULL) { + /* + * Value has form "x=y", adjust pointers and lengths + * so that val points to "x", and eq_val points to "y". + */ + eq_val->len = 0; + eq_val->ptr = memchr(val->ptr, '=', val->len); + if (eq_val->ptr != NULL) { + eq_val->ptr++; /* Skip over '=' character */ + eq_val->len = val->ptr + val->len - eq_val->ptr; + val->len = (eq_val->ptr - val->ptr) - 1; + } + } + } + + return list; +} + +#if !defined(NO_CGI) +static int match_extension(const char *path, const char *ext_list) { + struct vec ext_vec; + size_t path_len; + + path_len = strlen(path); + + while ((ext_list = next_option(ext_list, &ext_vec, NULL)) != NULL) + if (ext_vec.len < path_len && + mg_strncasecmp(path + path_len - ext_vec.len, + ext_vec.ptr, ext_vec.len) == 0) + return 1; + + return 0; +} +#endif // !NO_CGI + +// HTTP 1.1 assumes keep alive if "Connection:" header is not set +// This function must tolerate situations when connection info is not +// set up, for example if request parsing failed. +static int should_keep_alive(const struct mg_connection *conn) { + const char *http_version = conn->request_info.http_version; + const char *header = mg_get_header(conn, "Connection"); + return (header == NULL && http_version && !strcmp(http_version, "1.1")) || + (header != NULL && !strcmp(header, "keep-alive")); +} + +static const char *suggest_connection_header(const struct mg_connection *conn) { + return should_keep_alive(conn) ? "keep-alive" : "close"; +} + +static void send_http_error(struct mg_connection *conn, int status, + const char *reason, const char *fmt, ...) { + char buf[BUFSIZ]; + va_list ap; + int len; + + conn->request_info.status_code = status; + + if (call_user(conn, MG_HTTP_ERROR) == NULL) { + buf[0] = '\0'; + len = 0; + + /* Errors 1xx, 204 and 304 MUST NOT send a body */ + if (status > 199 && status != 204 && status != 304) { + len = mg_snprintf(conn, buf, sizeof(buf), "Error %d: %s", status, reason); + cry(conn, "%s", buf); + buf[len++] = '\n'; + + va_start(ap, fmt); + len += mg_vsnprintf(conn, buf + len, sizeof(buf) - len, fmt, ap); + va_end(ap); + } + DEBUG_TRACE(("[%s]", buf)); + + mg_printf(conn, "HTTP/1.1 %d %s\r\n" + "Content-Type: text/plain\r\n" + "Content-Length: %d\r\n" + "Connection: %s\r\n\r\n", status, reason, len, + suggest_connection_header(conn)); + conn->num_bytes_sent += mg_printf(conn, "%s", buf); + } +} + +#ifdef _WIN32 +static int pthread_mutex_init(pthread_mutex_t *mutex, void *unused) { + unused = NULL; + *mutex = CreateMutex(NULL, FALSE, NULL); + return *mutex == NULL ? -1 : 0; +} + +static int pthread_mutex_destroy(pthread_mutex_t *mutex) { + return CloseHandle(*mutex) == 0 ? -1 : 0; +} + +static int pthread_mutex_lock(pthread_mutex_t *mutex) { + return WaitForSingleObject(*mutex, INFINITE) == WAIT_OBJECT_0? 0 : -1; +} + +static int pthread_mutex_unlock(pthread_mutex_t *mutex) { + return ReleaseMutex(*mutex) == 0 ? -1 : 0; +} + +static int pthread_cond_init(pthread_cond_t *cv, const void *unused) { + unused = NULL; + cv->signal = CreateEvent(NULL, FALSE, FALSE, NULL); + cv->broadcast = CreateEvent(NULL, TRUE, FALSE, NULL); + return cv->signal != NULL && cv->broadcast != NULL ? 0 : -1; +} + +static int pthread_cond_wait(pthread_cond_t *cv, pthread_mutex_t *mutex) { + HANDLE handles[] = {cv->signal, cv->broadcast}; + ReleaseMutex(*mutex); + WaitForMultipleObjects(2, handles, FALSE, INFINITE); + return ReleaseMutex(*mutex) == 0 ? -1 : 0; +} + +static int pthread_cond_signal(pthread_cond_t *cv) { + return SetEvent(cv->signal) == 0 ? -1 : 0; +} + +static int pthread_cond_broadcast(pthread_cond_t *cv) { + // Implementation with PulseEvent() has race condition, see + // http://www.cs.wustl.edu/~schmidt/win32-cv-1.html + return PulseEvent(cv->broadcast) == 0 ? -1 : 0; +} + +static int pthread_cond_destroy(pthread_cond_t *cv) { + return CloseHandle(cv->signal) && CloseHandle(cv->broadcast) ? 0 : -1; +} + +static pthread_t pthread_self(void) { + return GetCurrentThreadId(); +} + +// For Windows, change all slashes to backslashes in path names. +static void change_slashes_to_backslashes(char *path) { + int i; + + for (i = 0; path[i] != '\0'; i++) { + if (path[i] == '/') + path[i] = '\\'; + // i > 0 check is to preserve UNC paths, like \\server\file.txt + if (path[i] == '\\' && i > 0) + while (path[i + 1] == '\\' || path[i + 1] == '/') + (void) memmove(path + i + 1, + path + i + 2, strlen(path + i + 1)); + } +} + +// Encode 'path' which is assumed UTF-8 string, into UNICODE string. +// wbuf and wbuf_len is a target buffer and its length. +static void to_unicode(const char *path, wchar_t *wbuf, size_t wbuf_len) { + char buf[PATH_MAX], *p; + + mg_strlcpy(buf, path, sizeof(buf)); + change_slashes_to_backslashes(buf); + + // Point p to the end of the file name + p = buf + strlen(buf) - 1; + + // Trim trailing backslash character + while (p > buf && *p == '\\' && p[-1] != ':') { + *p-- = '\0'; + } + + // Protect from CGI code disclosure. + // This is very nasty hole. Windows happily opens files with + // some garbage in the end of file name. So fopen("a.cgi ", "r") + // actually opens "a.cgi", and does not return an error! + if (*p == 0x20 || // No space at the end + (*p == 0x2e && p > buf) || // No '.' but allow '.' as full path + *p == 0x2b || // No '+' + (*p & ~0x7f)) { // And generally no non-ascii chars + (void) fprintf(stderr, "Rejecting suspicious path: [%s]", buf); + buf[0] = '\0'; + } + + (void) MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, (int) wbuf_len); +} + +#if defined(_WIN32_WCE) +static time_t time(time_t *ptime) { + time_t t; + SYSTEMTIME st; + FILETIME ft; + + GetSystemTime(&st); + SystemTimeToFileTime(&st, &ft); + t = SYS2UNIX_TIME(ft.dwLowDateTime, ft.dwHighDateTime); + + if (ptime != NULL) { + *ptime = t; + } + + return t; +} + +static time_t mktime(struct tm *ptm) { + SYSTEMTIME st; + FILETIME ft, lft; + + st.wYear = ptm->tm_year + 1900; + st.wMonth = ptm->tm_mon + 1; + st.wDay = ptm->tm_mday; + st.wHour = ptm->tm_hour; + st.wMinute = ptm->tm_min; + st.wSecond = ptm->tm_sec; + st.wMilliseconds = 0; + + SystemTimeToFileTime(&st, &ft); + LocalFileTimeToFileTime(&ft, &lft); + return (time_t) ((MAKEUQUAD(lft.dwLowDateTime, lft.dwHighDateTime) - + EPOCH_DIFF) / RATE_DIFF); +} + +static struct tm *localtime(const time_t *ptime, struct tm *ptm) { + int64_t t = ((int64_t) *ptime) * RATE_DIFF + EPOCH_DIFF; + FILETIME ft, lft; + SYSTEMTIME st; + TIME_ZONE_INFORMATION tzinfo; + + if (ptm == NULL) { + return NULL; + } + + * (int64_t *) &ft = t; + FileTimeToLocalFileTime(&ft, &lft); + FileTimeToSystemTime(&lft, &st); + ptm->tm_year = st.wYear - 1900; + ptm->tm_mon = st.wMonth - 1; + ptm->tm_wday = st.wDayOfWeek; + ptm->tm_mday = st.wDay; + ptm->tm_hour = st.wHour; + ptm->tm_min = st.wMinute; + ptm->tm_sec = st.wSecond; + ptm->tm_yday = 0; // hope nobody uses this + ptm->tm_isdst = + GetTimeZoneInformation(&tzinfo) == TIME_ZONE_ID_DAYLIGHT ? 1 : 0; + + return ptm; +} + +static size_t strftime(char *dst, size_t dst_size, const char *fmt, + const struct tm *tm) { + (void) snprintf(dst, dst_size, "implement strftime() for WinCE"); + return 0; +} +#endif + +static int mg_rename(const char* oldname, const char* newname) { + wchar_t woldbuf[PATH_MAX]; + wchar_t wnewbuf[PATH_MAX]; + + to_unicode(oldname, woldbuf, ARRAY_SIZE(woldbuf)); + to_unicode(newname, wnewbuf, ARRAY_SIZE(wnewbuf)); + + return MoveFileW(woldbuf, wnewbuf) ? 0 : -1; +} + + +static FILE *mg_fopen(const char *path, const char *mode) { + wchar_t wbuf[PATH_MAX], wmode[20]; + + to_unicode(path, wbuf, ARRAY_SIZE(wbuf)); + MultiByteToWideChar(CP_UTF8, 0, mode, -1, wmode, ARRAY_SIZE(wmode)); + + return _wfopen(wbuf, wmode); +} + +static int mg_stat(const char *path, struct mgstat *stp) { + int ok = -1; // Error + wchar_t wbuf[PATH_MAX]; + WIN32_FILE_ATTRIBUTE_DATA info; + + to_unicode(path, wbuf, ARRAY_SIZE(wbuf)); + + if (GetFileAttributesExW(wbuf, GetFileExInfoStandard, &info) != 0) { + stp->size = MAKEUQUAD(info.nFileSizeLow, info.nFileSizeHigh); + stp->mtime = SYS2UNIX_TIME(info.ftLastWriteTime.dwLowDateTime, + info.ftLastWriteTime.dwHighDateTime); + stp->is_directory = + info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY; + ok = 0; // Success + } + + return ok; +} + +static int mg_remove(const char *path) { + wchar_t wbuf[PATH_MAX]; + to_unicode(path, wbuf, ARRAY_SIZE(wbuf)); + return DeleteFileW(wbuf) ? 0 : -1; +} + +static int mg_mkdir(const char *path, int mode) { + char buf[PATH_MAX]; + wchar_t wbuf[PATH_MAX]; + + mode = 0; // Unused + mg_strlcpy(buf, path, sizeof(buf)); + change_slashes_to_backslashes(buf); + + (void) MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, sizeof(wbuf)); + + return CreateDirectoryW(wbuf, NULL) ? 0 : -1; +} + +// Implementation of POSIX opendir/closedir/readdir for Windows. +static DIR * opendir(const char *name) { + DIR *dir = NULL; + wchar_t wpath[PATH_MAX]; + DWORD attrs; + + if (name == NULL) { + SetLastError(ERROR_BAD_ARGUMENTS); + } else if ((dir = (DIR *) malloc(sizeof(*dir))) == NULL) { + SetLastError(ERROR_NOT_ENOUGH_MEMORY); + } else { + to_unicode(name, wpath, ARRAY_SIZE(wpath)); + attrs = GetFileAttributesW(wpath); + if (attrs != 0xFFFFFFFF && + ((attrs & FILE_ATTRIBUTE_DIRECTORY) == FILE_ATTRIBUTE_DIRECTORY)) { + (void) wcscat(wpath, L"\\*"); + dir->handle = FindFirstFileW(wpath, &dir->info); + dir->result.d_name[0] = '\0'; + } else { + free(dir); + dir = NULL; + } + } + + return dir; +} + +static int closedir(DIR *dir) { + int result = 0; + + if (dir != NULL) { + if (dir->handle != INVALID_HANDLE_VALUE) + result = FindClose(dir->handle) ? 0 : -1; + + free(dir); + } else { + result = -1; + SetLastError(ERROR_BAD_ARGUMENTS); + } + + return result; +} + +struct dirent * readdir(DIR *dir) { + struct dirent *result = 0; + + if (dir) { + if (dir->handle != INVALID_HANDLE_VALUE) { + result = &dir->result; + (void) WideCharToMultiByte(CP_UTF8, 0, + dir->info.cFileName, -1, result->d_name, + sizeof(result->d_name), NULL, NULL); + + if (!FindNextFileW(dir->handle, &dir->info)) { + (void) FindClose(dir->handle); + dir->handle = INVALID_HANDLE_VALUE; + } + + } else { + SetLastError(ERROR_FILE_NOT_FOUND); + } + } else { + SetLastError(ERROR_BAD_ARGUMENTS); + } + + return result; +} + +#define set_close_on_exec(fd) // No FD_CLOEXEC on Windows + +static int start_thread(struct mg_context *ctx, mg_thread_func_pt func, + void *param) { + HANDLE hThread; + ctx = NULL; // Unused + + hThread = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE) func, param, 0, + NULL); + if (hThread != NULL) { + (void) CloseHandle(hThread); + } + + return hThread == NULL ? -1 : 0; +} + +static HANDLE dlopen(const char *dll_name, int flags) { + wchar_t wbuf[PATH_MAX]; + flags = 0; // Unused + to_unicode(dll_name, wbuf, ARRAY_SIZE(wbuf)); + return LoadLibraryW(wbuf); +} + +#if !defined(NO_CGI) +#define SIGKILL 0 +static int kill(pid_t pid, int sig_num) { + (void) TerminateProcess(pid, sig_num); + (void) CloseHandle(pid); + return 0; +} + +static pid_t spawn_process(struct mg_connection *conn, const char *prog, + char *envblk, char *envp[], int fd_stdin, + int fd_stdout, const char *dir) { + HANDLE me; + char *p, *interp, cmdline[PATH_MAX], buf[PATH_MAX]; + FILE *fp; + STARTUPINFOA si; + PROCESS_INFORMATION pi; + + envp = NULL; // Unused + + (void) memset(&si, 0, sizeof(si)); + (void) memset(&pi, 0, sizeof(pi)); + + // TODO(lsm): redirect CGI errors to the error log file + si.cb = sizeof(si); + si.dwFlags = STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW; + si.wShowWindow = SW_HIDE; + + me = GetCurrentProcess(); + (void) DuplicateHandle(me, (HANDLE) _get_osfhandle(fd_stdin), me, + &si.hStdInput, 0, TRUE, DUPLICATE_SAME_ACCESS); + (void) DuplicateHandle(me, (HANDLE) _get_osfhandle(fd_stdout), me, + &si.hStdOutput, 0, TRUE, DUPLICATE_SAME_ACCESS); + + // If CGI file is a script, try to read the interpreter line + interp = conn->ctx->config[CGI_INTERPRETER]; + if (interp == NULL) { + buf[2] = '\0'; + if ((fp = fopen(cmdline, "r")) != NULL) { + (void) fgets(buf, sizeof(buf), fp); + if (buf[0] != '#' || buf[1] != '!') { + // First line does not start with "#!". Do not set interpreter. + buf[2] = '\0'; + } else { + // Trim whitespaces in interpreter name + for (p = &buf[strlen(buf) - 1]; p > buf && isspace(*p); p--) { + *p = '\0'; + } + } + (void) fclose(fp); + } + interp = buf + 2; + } + + (void) mg_snprintf(conn, cmdline, sizeof(cmdline), "%s%s%s%c%s", + interp, interp[0] == '\0' ? "" : " ", dir, DIRSEP, prog); + + DEBUG_TRACE(("Running [%s]", cmdline)); + if (CreateProcessA(NULL, cmdline, NULL, NULL, TRUE, + CREATE_NEW_PROCESS_GROUP, envblk, dir, &si, &pi) == 0) { + cry(conn, "%s: CreateProcess(%s): %d", + __func__, cmdline, ERRNO); + pi.hProcess = (pid_t) -1; + } else { + (void) close(fd_stdin); + (void) close(fd_stdout); + } + + (void) CloseHandle(si.hStdOutput); + (void) CloseHandle(si.hStdInput); + (void) CloseHandle(pi.hThread); + + return (pid_t) pi.hProcess; +} +#endif /* !NO_CGI */ + +static int set_non_blocking_mode(SOCKET sock) { + unsigned long on = 1; + return ioctlsocket(sock, FIONBIO, &on); +} + +#else +static int mg_stat(const char *path, struct mgstat *stp) { + struct stat st; + int ok; + + if (stat(path, &st) == 0) { + ok = 0; + stp->size = st.st_size; + stp->mtime = st.st_mtime; + stp->is_directory = S_ISDIR(st.st_mode); + } else { + ok = -1; + } + + return ok; +} + +static void set_close_on_exec(int fd) { + (void) fcntl(fd, F_SETFD, FD_CLOEXEC); +} + +static int start_thread(struct mg_context *ctx, mg_thread_func_pt func, + void *param) { + pthread_t thread_id; + pthread_attr_t attr; + int retval; + + (void) pthread_attr_init(&attr); + (void) pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); + // TODO(lsm): figure out why mongoose dies on Linux if next line is enabled + // (void) pthread_attr_setstacksize(&attr, sizeof(struct mg_connection) * 5); + + if ((retval = pthread_create(&thread_id, &attr, func, param)) != 0) { + cry(fc(ctx), "%s: %s", __func__, strerror(retval)); + } + + return retval; +} + +#ifndef NO_CGI +static pid_t spawn_process(struct mg_connection *conn, const char *prog, + __attribute__((unused)) char *envblk, char *envp[], int fd_stdin, + int fd_stdout, const char *dir) { + pid_t pid; + const char *interp; + + // envblk = NULL; // Unused + + if ((pid = fork()) == -1) { + // Parent + send_http_error(conn, 500, http_500_error, "fork(): %s", strerror(ERRNO)); + } else if (pid == 0) { + // Child + if (chdir(dir) != 0) { + cry(conn, "%s: chdir(%s): %s", __func__, dir, strerror(ERRNO)); + } else if (dup2(fd_stdin, 0) == -1) { + cry(conn, "%s: dup2(%d, 0): %s", __func__, fd_stdin, strerror(ERRNO)); + } else if (dup2(fd_stdout, 1) == -1) { + cry(conn, "%s: dup2(%d, 1): %s", __func__, fd_stdout, strerror(ERRNO)); + } else { + (void) dup2(fd_stdout, 2); + (void) close(fd_stdin); + (void) close(fd_stdout); + + // Execute CGI program. No need to lock: new process + interp = conn->ctx->config[CGI_INTERPRETER]; + if (interp == NULL) { + (void) execle(prog, prog, NULL, envp); + cry(conn, "%s: execle(%s): %s", __func__, prog, strerror(ERRNO)); + } else { + (void) execle(interp, interp, prog, NULL, envp); + cry(conn, "%s: execle(%s %s): %s", __func__, interp, prog, + strerror(ERRNO)); + } + } + exit(EXIT_FAILURE); + } else { + // Parent. Close stdio descriptors + (void) close(fd_stdin); + (void) close(fd_stdout); + } + + return pid; +} +#endif // !NO_CGI + +static int set_non_blocking_mode(SOCKET sock) { + int flags; + + flags = fcntl(sock, F_GETFL, 0); + (void) fcntl(sock, F_SETFL, flags | O_NONBLOCK); + + return 0; +} +#endif // _WIN32 + +// Write data to the IO channel - opened file descriptor, socket or SSL +// descriptor. Return number of bytes written. +static int64_t push(FILE *fp, SOCKET sock, SSL *ssl, const char *buf, + int64_t len) { + int64_t sent; + int n, k; + + sent = 0; + while (sent < len) { + + /* How many bytes we send in this iteration */ + k = len - sent > INT_MAX ? INT_MAX : (int) (len - sent); + + if (ssl != NULL) { + n = SSL_write(ssl, buf + sent, k); + } else if (fp != NULL) { + n = fwrite(buf + sent, 1, k, fp); + if (ferror(fp)) + n = -1; + } else { + n = send(sock, buf + sent, k, 0); + } + + if (n < 0) + break; + + sent += n; + } + + return sent; +} + +// Read from IO channel - opened file descriptor, socket, or SSL descriptor. +// Return number of bytes read. +static int pull(FILE *fp, SOCKET sock, SSL *ssl, char *buf, int len) { + int nread; + + if (ssl != NULL) { + nread = SSL_read(ssl, buf, len); + } else if (fp != NULL) { + nread = fread(buf, 1, (size_t) len, fp); + if (ferror(fp)) + nread = -1; + } else { + nread = recv(sock, buf, (size_t) len, 0); + } + + return nread; +} + +int mg_read(struct mg_connection *conn, void *buf, size_t len) { + int n, buffered_len, nread; + const char *buffered; + + assert(conn->content_len >= conn->consumed_content); + DEBUG_TRACE(("%p %zu %ld %ld", buf, len, + (long)conn->content_len, (long)conn->consumed_content)); + nread = 0; + if (strcmp(conn->request_info.request_method, "POST") == 0 && + conn->consumed_content < conn->content_len) { + + // Adjust number of bytes to read. + int64_t to_read = conn->content_len - conn->consumed_content; + if (to_read < (int64_t) len) { + len = (int) to_read; + } + + // How many bytes of data we have buffered in the request buffer? + buffered = conn->buf + conn->request_len; + buffered_len = conn->data_len - conn->request_len; + assert(buffered_len >= 0); + + // Return buffered data back if we haven't done that yet. + if (conn->consumed_content < (int64_t) buffered_len) { + buffered_len -= (int) conn->consumed_content; + if (len < (size_t) buffered_len) { + buffered_len = len; + } + memcpy(buf, buffered, buffered_len); + len -= buffered_len; + buf = (char *) buf + buffered_len; + conn->consumed_content += buffered_len; + nread = buffered_len; + } + + // We have returned all buffered data. Read new data from the remote socket. + while (len > 0) { + n = pull(NULL, conn->client.sock, conn->ssl, (char *) buf, (int) len); + if (n <= 0) { + break; + } + buf = (char *) buf + n; + conn->consumed_content += n; + nread += n; + len -= n; + } + } + return nread; +} + +int mg_write(struct mg_connection *conn, const void *buf, size_t len) { + return (int) push(NULL, conn->client.sock, conn->ssl, + (const char *) buf, (int64_t) len); +} + +int mg_printf(struct mg_connection *conn, const char *fmt, ...) { + char buf[BUFSIZ]; + int len; + va_list ap; + + va_start(ap, fmt); + len = mg_vsnprintf(conn, buf, sizeof(buf), fmt, ap); + va_end(ap); + + return mg_write(conn, buf, len); +} + +// URL-decode input buffer into destination buffer. +// 0-terminate the destination buffer. Return the length of decoded data. +// form-url-encoded data differs from URI encoding in a way that it +// uses '+' as character for space, see RFC 1866 section 8.2.1 +// http://ftp.ics.uci.edu/pub/ietf/html/rfc1866.txt +static size_t url_decode(const char *src, size_t src_len, char *dst, + size_t dst_len, int is_form_url_encoded) { + size_t i, j; + int a, b; +#define HEXTOI(x) (isdigit(x) ? x - '0' : x - 'W') + + for (i = j = 0; i < src_len && j < dst_len - 1; i++, j++) { + if (src[i] == '%' && + isxdigit(* (unsigned char *) (src + i + 1)) && + isxdigit(* (unsigned char *) (src + i + 2))) { + a = tolower(* (unsigned char *) (src + i + 1)); + b = tolower(* (unsigned char *) (src + i + 2)); + dst[j] = (char) ((HEXTOI(a) << 4) | HEXTOI(b)); + i += 2; + } else if (is_form_url_encoded && src[i] == '+') { + dst[j] = ' '; + } else { + dst[j] = src[i]; + } + } + + dst[j] = '\0'; /* Null-terminate the destination */ + + return j; +} + +// Scan given buffer and fetch the value of the given variable. +// It can be specified in query string, or in the POST data. +// Return NULL if the variable not found, or allocated 0-terminated value. +// It is caller's responsibility to free the returned value. +int mg_get_var(const char *buf, size_t buf_len, const char *name, + char *dst, size_t dst_len) { + const char *p, *e, *s; + size_t name_len, len; + + name_len = strlen(name); + e = buf + buf_len; + len = -1; + dst[0] = '\0'; + + // buf is "var1=val1&var2=val2...". Find variable first + for (p = buf; p != NULL && p + name_len < e; p++) { + if ((p == buf || p[-1] == '&') && p[name_len] == '=' && + !mg_strncasecmp(name, p, name_len)) { + + // Point p to variable value + p += name_len + 1; + + // Point s to the end of the value + s = (const char *) memchr(p, '&', e - p); + if (s == NULL) { + s = e; + } + assert(s >= p); + + // Decode variable into destination buffer + if ((size_t) (s - p) < dst_len) { + len = url_decode(p, s - p, dst, dst_len, 1); + } + break; + } + } + + return len; +} + +int mg_get_cookie(const struct mg_connection *conn, const char *cookie_name, + char *dst, size_t dst_size) { + const char *s, *p, *end; + int name_len, len = -1; + + dst[0] = '\0'; + if ((s = mg_get_header(conn, "Cookie")) == NULL) { + return 0; + } + + name_len = strlen(cookie_name); + end = s + strlen(s); + + for (; (s = strstr(s, cookie_name)) != NULL; s += name_len) + if (s[name_len] == '=') { + s += name_len + 1; + if ((p = strchr(s, ' ')) == NULL) + p = end; + if (p[-1] == ';') + p--; + if (*s == '"' && p[-1] == '"' && p > s + 1) { + s++; + p--; + } + if ((size_t) (p - s) < dst_size) { + len = (p - s) + 1; + mg_strlcpy(dst, s, len); + } + break; + } + + return len; +} + +// Mongoose allows to specify multiple directories to serve, +// like /var/www,/~bob=/home/bob. That means that root directory depends on URI. +// This function returns root dir for given URI. +static int get_document_root(const struct mg_connection *conn, + struct vec *document_root) { + const char *root, *uri; + int len_of_matched_uri; + struct vec uri_vec, path_vec; + + uri = conn->request_info.uri; + len_of_matched_uri = 0; + root = next_option(conn->ctx->config[DOCUMENT_ROOT], document_root, NULL); + + while ((root = next_option(root, &uri_vec, &path_vec)) != NULL) { + if (memcmp(uri, uri_vec.ptr, uri_vec.len) == 0) { + *document_root = path_vec; + len_of_matched_uri = uri_vec.len; + break; + } + } + + return len_of_matched_uri; +} + +static void convert_uri_to_file_name(struct mg_connection *conn, + const char *uri, char *buf, + size_t buf_len) { + struct vec vec; + int match_len; + + match_len = get_document_root(conn, &vec); + mg_snprintf(conn, buf, buf_len, "%.*s%s", vec.len, vec.ptr, uri + match_len); + +#ifdef _WIN32 + change_slashes_to_backslashes(buf); +#endif /* _WIN32 */ + + DEBUG_TRACE(("[%s] -> [%s], [%.*s]", uri, buf, (int) vec.len, vec.ptr)); +} + +static int sslize(struct mg_connection *conn, int (*func)(SSL *)) { + return (conn->ssl = SSL_new(conn->ctx->ssl_ctx)) != NULL && + SSL_set_fd(conn->ssl, conn->client.sock) == 1 && + func(conn->ssl) == 1; +} + +struct mg_connection *mg_connect(struct mg_connection *conn, + const char *host, int port, int use_ssl) { + struct mg_connection *newconn = NULL; + struct sockaddr_in sin; + struct hostent *he; + int sock; + + if (conn->ctx->ssl_ctx == NULL && use_ssl) { + cry(conn, "%s: SSL is not initialized", __func__); + } else if ((he = gethostbyname(host)) == NULL) { + cry(conn, "%s: gethostbyname(%s): %s", __func__, host, strerror(ERRNO)); + } else if ((sock = socket(PF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET) { + cry(conn, "%s: socket: %s", __func__, strerror(ERRNO)); + } else { + sin.sin_family = AF_INET; + sin.sin_port = htons((uint16_t) port); + sin.sin_addr = * (struct in_addr *) he->h_addr_list[0]; + if (connect(sock, (struct sockaddr *) &sin, sizeof(sin)) != 0) { + cry(conn, "%s: connect(%s:%d): %s", __func__, host, port, + strerror(ERRNO)); + closesocket(sock); + } else if ((newconn = calloc(1, sizeof(*newconn))) == NULL) { + cry(conn, "%s: calloc: %s", __func__, strerror(ERRNO)); + closesocket(sock); + } else { + newconn->client.sock = sock; + newconn->client.rsa.u.sin = sin; + if (use_ssl) { + sslize(newconn, SSL_connect); + } + } + } + + return newconn; +} + +// Check whether full request is buffered. Return: +// -1 if request is malformed +// 0 if request is not yet fully buffered +// >0 actual request length, including last \r\n\r\n +static int get_request_len(const char *buf, int buflen) { + const char *s, *e; + int len = 0; + + DEBUG_TRACE(("buf: %p, len: %d", buf, buflen)); + for (s = buf, e = s + buflen - 1; len <= 0 && s < e; s++) + // Control characters are not allowed but >=128 is. + if (!isprint(* (unsigned char *) s) && *s != '\r' && + *s != '\n' && * (unsigned char *) s < 128) { + len = -1; + } else if (s[0] == '\n' && s[1] == '\n') { + len = (int) (s - buf) + 2; + } else if (s[0] == '\n' && &s[1] < e && + s[1] == '\r' && s[2] == '\n') { + len = (int) (s - buf) + 3; + } + + return len; +} + +// Convert month to the month number. Return -1 on error, or month number +static int month_number_to_month_name(const char *s) { + size_t i; + + for (i = 0; i < ARRAY_SIZE(month_names); i++) + if (!strcmp(s, month_names[i])) + return (int) i; + + return -1; +} + +// Parse date-time string, and return the corresponding time_t value +static time_t parse_date_string(const char *s) { + time_t current_time; + struct tm tm, *tmp; + char mon[32]; + int sec, min, hour, mday, month, year; + + (void) memset(&tm, 0, sizeof(tm)); + sec = min = hour = mday = month = year = 0; + + if (((sscanf(s, "%d/%3s/%d %d:%d:%d", + &mday, mon, &year, &hour, &min, &sec) == 6) || + (sscanf(s, "%d %3s %d %d:%d:%d", + &mday, mon, &year, &hour, &min, &sec) == 6) || + (sscanf(s, "%*3s, %d %3s %d %d:%d:%d", + &mday, mon, &year, &hour, &min, &sec) == 6) || + (sscanf(s, "%d-%3s-%d %d:%d:%d", + &mday, mon, &year, &hour, &min, &sec) == 6)) && + (month = month_number_to_month_name(mon)) != -1) { + tm.tm_mday = mday; + tm.tm_mon = month; + tm.tm_year = year; + tm.tm_hour = hour; + tm.tm_min = min; + tm.tm_sec = sec; + } + + if (tm.tm_year > 1900) { + tm.tm_year -= 1900; + } else if (tm.tm_year < 70) { + tm.tm_year += 100; + } + + // Set Daylight Saving Time field + current_time = time(NULL); + tmp = localtime(¤t_time); + tm.tm_isdst = tmp->tm_isdst; + + return mktime(&tm); +} + +// Protect against directory disclosure attack by removing '..', +// excessive '/' and '\' characters +static void remove_double_dots_and_double_slashes(char *s) { + char *p = s; + + while (*s != '\0') { + *p++ = *s++; + if (s[-1] == '/' || s[-1] == '\\') { + // Skip all following slashes and backslashes + while (*s == '/' || *s == '\\') { + s++; + } + + // Skip all double-dots + while (*s == '.' && s[1] == '.') { + s += 2; + } + } + } + *p = '\0'; +} + +static const struct { + const char *extension; + size_t ext_len; + const char *mime_type; + size_t mime_type_len; +} builtin_mime_types[] = { + {".html", 5, "text/html", 9}, + {".htm", 4, "text/html", 9}, + {".shtm", 5, "text/html", 9}, + {".shtml", 6, "text/html", 9}, + {".css", 4, "text/css", 8}, + {".js", 3, "application/x-javascript", 24}, + {".ico", 4, "image/x-icon", 12}, + {".gif", 4, "image/gif", 9}, + {".jpg", 4, "image/jpeg", 10}, + {".jpeg", 5, "image/jpeg", 10}, + {".png", 4, "image/png", 9}, + {".svg", 4, "image/svg+xml", 13}, + {".torrent", 8, "application/x-bittorrent", 24}, + {".wav", 4, "audio/x-wav", 11}, + {".mp3", 4, "audio/x-mp3", 11}, + {".mid", 4, "audio/mid", 9}, + {".m3u", 4, "audio/x-mpegurl", 15}, + {".ram", 4, "audio/x-pn-realaudio", 20}, + {".xml", 4, "text/xml", 8}, + {".xslt", 5, "application/xml", 15}, + {".ra", 3, "audio/x-pn-realaudio", 20}, + {".doc", 4, "application/msword", 19}, + {".exe", 4, "application/octet-stream", 24}, + {".zip", 4, "application/x-zip-compressed", 28}, + {".xls", 4, "application/excel", 17}, + {".tgz", 4, "application/x-tar-gz", 20}, + {".tar", 4, "application/x-tar", 17}, + {".gz", 3, "application/x-gunzip", 20}, + {".arj", 4, "application/x-arj-compressed", 28}, + {".rar", 4, "application/x-arj-compressed", 28}, + {".rtf", 4, "application/rtf", 15}, + {".pdf", 4, "application/pdf", 15}, + {".swf", 4, "application/x-shockwave-flash",29}, + {".mpg", 4, "video/mpeg", 10}, + {".mpeg", 5, "video/mpeg", 10}, + {".asf", 4, "video/x-ms-asf", 14}, + {".avi", 4, "video/x-msvideo", 15}, + {".bmp", 4, "image/bmp", 9}, + {NULL, 0, NULL, 0} +}; + +// Look at the "path" extension and figure what mime type it has. +// Store mime type in the vector. +static void get_mime_type(struct mg_context *ctx, const char *path, + struct vec *vec) { + struct vec ext_vec, mime_vec; + const char *list, *ext; + size_t i, path_len; + + path_len = strlen(path); + + // Scan user-defined mime types first, in case user wants to + // override default mime types. + list = ctx->config[EXTRA_MIME_TYPES]; + while ((list = next_option(list, &ext_vec, &mime_vec)) != NULL) { + // ext now points to the path suffix + ext = path + path_len - ext_vec.len; + if (mg_strncasecmp(ext, ext_vec.ptr, ext_vec.len) == 0) { + *vec = mime_vec; + return; + } + } + + // Now scan built-in mime types + for (i = 0; builtin_mime_types[i].extension != NULL; i++) { + ext = path + (path_len - builtin_mime_types[i].ext_len); + if (path_len > builtin_mime_types[i].ext_len && + mg_strcasecmp(ext, builtin_mime_types[i].extension) == 0) { + vec->ptr = builtin_mime_types[i].mime_type; + vec->len = builtin_mime_types[i].mime_type_len; + return; + } + } + + // Nothing found. Fall back to "text/plain" + vec->ptr = "text/plain"; + vec->len = 10; +} + +#ifndef HAVE_MD5 +typedef struct MD5Context { + uint32_t buf[4]; + uint32_t bits[2]; + unsigned char in[64]; +} MD5_CTX; + +#if __BYTE_ORDER == 1234 +#define byteReverse(buf, len) // Do nothing +#else +static void byteReverse(unsigned char *buf, unsigned longs) { + uint32_t t; + do { + t = (uint32_t) ((unsigned) buf[3] << 8 | buf[2]) << 16 | + ((unsigned) buf[1] << 8 | buf[0]); + *(uint32_t *) buf = t; + buf += 4; + } while (--longs); +} +#endif + +#define F1(x, y, z) (z ^ (x & (y ^ z))) +#define F2(x, y, z) F1(z, x, y) +#define F3(x, y, z) (x ^ y ^ z) +#define F4(x, y, z) (y ^ (x | ~z)) + +#define MD5STEP(f, w, x, y, z, data, s) \ + ( w += f(x, y, z) + data, w = w<>(32-s), w += x ) + +// Start MD5 accumulation. Set bit count to 0 and buffer to mysterious +// initialization constants. +static void MD5Init(MD5_CTX *ctx) { + ctx->buf[0] = 0x67452301; + ctx->buf[1] = 0xefcdab89; + ctx->buf[2] = 0x98badcfe; + ctx->buf[3] = 0x10325476; + + ctx->bits[0] = 0; + ctx->bits[1] = 0; +} + +static void MD5Transform(uint32_t buf[4], uint32_t const in[16]) { + register uint32_t a, b, c, d; + + a = buf[0]; + b = buf[1]; + c = buf[2]; + d = buf[3]; + + MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7); + MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12); + MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17); + MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22); + MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7); + MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12); + MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17); + MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22); + MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7); + MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12); + MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17); + MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22); + MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7); + MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12); + MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17); + MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22); + + MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5); + MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9); + MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14); + MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20); + MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5); + MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9); + MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14); + MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20); + MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5); + MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9); + MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14); + MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20); + MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5); + MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9); + MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14); + MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20); + + MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4); + MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11); + MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16); + MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23); + MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4); + MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11); + MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16); + MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23); + MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4); + MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11); + MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16); + MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23); + MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4); + MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11); + MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16); + MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23); + + MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6); + MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10); + MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15); + MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21); + MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6); + MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10); + MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15); + MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21); + MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6); + MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10); + MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15); + MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21); + MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6); + MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10); + MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15); + MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21); + + buf[0] += a; + buf[1] += b; + buf[2] += c; + buf[3] += d; +} + +static void MD5Update(MD5_CTX *ctx, unsigned char const *buf, unsigned len) { + uint32_t t; + + t = ctx->bits[0]; + if ((ctx->bits[0] = t + ((uint32_t) len << 3)) < t) + ctx->bits[1]++; + ctx->bits[1] += len >> 29; + + t = (t >> 3) & 0x3f; + + if (t) { + unsigned char *p = (unsigned char *) ctx->in + t; + + t = 64 - t; + if (len < t) { + memcpy(p, buf, len); + return; + } + memcpy(p, buf, t); + byteReverse(ctx->in, 16); + MD5Transform(ctx->buf, (uint32_t *) ctx->in); + buf += t; + len -= t; + } + + while (len >= 64) { + memcpy(ctx->in, buf, 64); + byteReverse(ctx->in, 16); + MD5Transform(ctx->buf, (uint32_t *) ctx->in); + buf += 64; + len -= 64; + } + + memcpy(ctx->in, buf, len); +} + +static void MD5Final(unsigned char digest[16], MD5_CTX *ctx) { + unsigned count; + unsigned char *p; + + count = (ctx->bits[0] >> 3) & 0x3F; + + p = ctx->in + count; + *p++ = 0x80; + count = 64 - 1 - count; + if (count < 8) { + memset(p, 0, count); + byteReverse(ctx->in, 16); + MD5Transform(ctx->buf, (uint32_t *) ctx->in); + memset(ctx->in, 0, 56); + } else { + memset(p, 0, count - 8); + } + byteReverse(ctx->in, 14); + + ((uint32_t *) ctx->in)[14] = ctx->bits[0]; + ((uint32_t *) ctx->in)[15] = ctx->bits[1]; + + MD5Transform(ctx->buf, (uint32_t *) ctx->in); + byteReverse((unsigned char *) ctx->buf, 4); + memcpy(digest, ctx->buf, 16); + memset((char *) ctx, 0, sizeof(*ctx)); +} +#endif // !HAVE_MD5 + +// Stringify binary data. Output buffer must be twice as big as input, +// because each byte takes 2 bytes in string representation +static void bin2str(char *to, const unsigned char *p, size_t len) { + static const char *hex = "0123456789abcdef"; + + for (; len--; p++) { + *to++ = hex[p[0] >> 4]; + *to++ = hex[p[0] & 0x0f]; + } + *to = '\0'; +} + +// Return stringified MD5 hash for list of vectors. Buffer must be 33 bytes. +void mg_md5(char *buf, ...) { + unsigned char hash[16]; + const char *p; + va_list ap; + MD5_CTX ctx; + + MD5Init(&ctx); + + va_start(ap, buf); + while ((p = va_arg(ap, const char *)) != NULL) { + MD5Update(&ctx, (unsigned char *) p, (int) strlen(p)); + } + va_end(ap); + + MD5Final(hash, &ctx); + bin2str(buf, hash, sizeof(hash)); +} + +// Check the user's password, return 1 if OK +static int check_password(const char *method, const char *ha1, const char *uri, + const char *nonce, const char *nc, const char *cnonce, + const char *qop, const char *response) { + char ha2[32 + 1], expected_response[32 + 1]; + + // NOTE(lsm): due to a bug in MSIE, we do not compare the URI + // TODO(lsm): check for authentication timeout + if (// strcmp(dig->uri, c->ouri) != 0 || + strlen(response) != 32 + // || now - strtoul(dig->nonce, NULL, 10) > 3600 + ) { + return 0; + } + + mg_md5(ha2, method, ":", uri, NULL); + mg_md5(expected_response, ha1, ":", nonce, ":", nc, + ":", cnonce, ":", qop, ":", ha2, NULL); + + return mg_strcasecmp(response, expected_response) == 0; +} + +// Use the global passwords file, if specified by auth_gpass option, +// or search for .htpasswd in the requested directory. +static FILE *open_auth_file(struct mg_connection *conn, const char *path) { + struct mg_context *ctx = conn->ctx; + char name[PATH_MAX]; + const char *p, *e; + struct mgstat st; + FILE *fp; + + if (ctx->config[GLOBAL_PASSWORDS_FILE] != NULL) { + // Use global passwords file + fp = mg_fopen(ctx->config[GLOBAL_PASSWORDS_FILE], "r"); + if (fp == NULL) + cry(fc(ctx), "fopen(%s): %s", + ctx->config[GLOBAL_PASSWORDS_FILE], strerror(ERRNO)); + } else if (!mg_stat(path, &st) && st.is_directory) { + (void) mg_snprintf(conn, name, sizeof(name), "%s%c%s", + path, DIRSEP, PASSWORDS_FILE_NAME); + fp = mg_fopen(name, "r"); + } else { + // Try to find .htpasswd in requested directory. + for (p = path, e = p + strlen(p) - 1; e > p; e--) + if (IS_DIRSEP_CHAR(*e)) + break; + (void) mg_snprintf(conn, name, sizeof(name), "%.*s%c%s", + (int) (e - p), p, DIRSEP, PASSWORDS_FILE_NAME); + fp = mg_fopen(name, "r"); + } + + return fp; +} + +// Parsed Authorization header +struct ah { + char *user, *uri, *cnonce, *response, *qop, *nc, *nonce; +}; + +static int parse_auth_header(struct mg_connection *conn, char *buf, + size_t buf_size, struct ah *ah) { + char *name, *value, *s; + const char *auth_header; + + if ((auth_header = mg_get_header(conn, "Authorization")) == NULL || + mg_strncasecmp(auth_header, "Digest ", 7) != 0) { + return 0; + } + + // Make modifiable copy of the auth header + (void) mg_strlcpy(buf, auth_header + 7, buf_size); + + s = buf; + (void) memset(ah, 0, sizeof(*ah)); + + // Gobble initial spaces + while (isspace(* (unsigned char *) s)) { + s++; + } + + // Parse authorization header + for (;;) { + name = skip(&s, "="); + value = skip(&s, " "); + + // Handle commas: Digest username="a", realm="b", ... + if (value[strlen(value) - 1] == ',') { + value[strlen(value) - 1] = '\0'; + } + + // Trim double quotes around values + if (*value == '"') { + value++; + value[strlen(value) - 1] = '\0'; + } else if (*value == '\0') { + break; + } + + if (!strcmp(name, "username")) { + ah->user = value; + } else if (!strcmp(name, "cnonce")) { + ah->cnonce = value; + } else if (!strcmp(name, "response")) { + ah->response = value; + } else if (!strcmp(name, "uri")) { + ah->uri = value; + } else if (!strcmp(name, "qop")) { + ah->qop = value; + } else if (!strcmp(name, "nc")) { + ah->nc = value; + } else if (!strcmp(name, "nonce")) { + ah->nonce = value; + } + } + + // CGI needs it as REMOTE_USER + if (ah->user != NULL) { + conn->request_info.remote_user = mg_strdup(ah->user); + } + + return 1; +} + +// Authorize against the opened passwords file. Return 1 if authorized. +static int authorize(struct mg_connection *conn, FILE *fp) { + struct ah ah; + char line[256], f_user[256], ha1[256], f_domain[256], buf[BUFSIZ]; + + if (!parse_auth_header(conn, buf, sizeof(buf), &ah)) { + return 0; + } + + // Loop over passwords file + while (fgets(line, sizeof(line), fp) != NULL) { + if (sscanf(line, "%[^:]:%[^:]:%s", f_user, f_domain, ha1) != 3) { + continue; + } + + if (!strcmp(ah.user, f_user) && + !strcmp(conn->ctx->config[AUTHENTICATION_DOMAIN], f_domain)) + return check_password( + conn->request_info.request_method, + ha1, ah.uri, ah.nonce, ah.nc, ah.cnonce, ah.qop, + ah.response); + } + + return 0; +} + +// Return 1 if request is authorised, 0 otherwise. +static int check_authorization(struct mg_connection *conn, const char *path) { + FILE *fp; + char fname[PATH_MAX]; + struct vec uri_vec, filename_vec; + const char *list; + int authorized; + + fp = NULL; + authorized = 1; + + list = conn->ctx->config[PROTECT_URI]; + while ((list = next_option(list, &uri_vec, &filename_vec)) != NULL) { + if (!memcmp(conn->request_info.uri, uri_vec.ptr, uri_vec.len)) { + (void) mg_snprintf(conn, fname, sizeof(fname), "%.*s", + filename_vec.len, filename_vec.ptr); + if ((fp = mg_fopen(fname, "r")) == NULL) { + cry(conn, "%s: cannot open %s: %s", __func__, fname, strerror(errno)); + } + break; + } + } + + if (fp == NULL) { + fp = open_auth_file(conn, path); + } + + if (fp != NULL) { + authorized = authorize(conn, fp); + (void) fclose(fp); + } + + return authorized; +} + +static void send_authorization_request(struct mg_connection *conn) { + conn->request_info.status_code = 401; + (void) mg_printf(conn, + "HTTP/1.1 401 Unauthorized\r\n" + "WWW-Authenticate: Digest qop=\"auth\", " + "realm=\"%s\", nonce=\"%lu\"\r\n\r\n", + conn->ctx->config[AUTHENTICATION_DOMAIN], + (unsigned long) time(NULL)); +} + +static int is_authorized_for_put(struct mg_connection *conn) { + FILE *fp; + int ret = 0; + + fp = conn->ctx->config[PUT_DELETE_PASSWORDS_FILE] == NULL ? NULL : + mg_fopen(conn->ctx->config[PUT_DELETE_PASSWORDS_FILE], "r"); + + if (fp != NULL) { + ret = authorize(conn, fp); + (void) fclose(fp); + } + + return ret; +} + +int mg_modify_passwords_file(struct mg_context *ctx, const char *fname, + const char *user, const char *pass) { + int found; + char line[512], u[512], d[512], ha1[33], tmp[PATH_MAX]; + const char *domain; + FILE *fp, *fp2; + + found = 0; + fp = fp2 = NULL; + domain = ctx->config[AUTHENTICATION_DOMAIN]; + + // Regard empty password as no password - remove user record. + if (pass[0] == '\0') { + pass = NULL; + } + + (void) snprintf(tmp, sizeof(tmp), "%s.tmp", fname); + + // Create the file if does not exist + if ((fp = mg_fopen(fname, "a+")) != NULL) { + (void) fclose(fp); + } + + // Open the given file and temporary file + if ((fp = mg_fopen(fname, "r")) == NULL) { + cry(fc(ctx), "Cannot open %s: %s", fname, strerror(errno)); + return 0; + } else if ((fp2 = mg_fopen(tmp, "w+")) == NULL) { + cry(fc(ctx), "Cannot open %s: %s", tmp, strerror(errno)); + fclose(fp); + return 0; + } + + // Copy the stuff to temporary file + while (fgets(line, sizeof(line), fp) != NULL) { + if (sscanf(line, "%[^:]:%[^:]:%*s", u, d) != 2) { + continue; + } + + if (!strcmp(u, user) && !strcmp(d, domain)) { + found++; + if (pass != NULL) { + mg_md5(ha1, user, ":", domain, ":", pass, NULL); + fprintf(fp2, "%s:%s:%s\n", user, domain, ha1); + } + } else { + (void) fprintf(fp2, "%s", line); + } + } + + // If new user, just add it + if (!found && pass != NULL) { + mg_md5(ha1, user, ":", domain, ":", pass, NULL); + (void) fprintf(fp2, "%s:%s:%s\n", user, domain, ha1); + } + + // Close files + (void) fclose(fp); + (void) fclose(fp2); + + // Put the temp file in place of real file + (void) mg_remove(fname); + (void) mg_rename(tmp, fname); + + return 1; +} + +struct de { + struct mg_connection *conn; + char *file_name; + struct mgstat st; +}; + +static void url_encode(const char *src, char *dst, size_t dst_len) { + static const char *dont_escape = "._-$,;~()"; + static const char *hex = "0123456789abcdef"; + const char *end = dst + dst_len - 1; + + for (; *src != '\0' && dst < end; src++, dst++) { + if (isalnum(*(unsigned char *) src) || + strchr(dont_escape, * (unsigned char *) src) != NULL) { + *dst = *src; + } else if (dst + 2 < end) { + dst[0] = '%'; + dst[1] = hex[(* (unsigned char *) src) >> 4]; + dst[2] = hex[(* (unsigned char *) src) & 0xf]; + dst += 2; + } + } + + *dst = '\0'; +} + +static void print_dir_entry(struct de *de) { + char size[64], mod[64], href[PATH_MAX]; + + if (de->st.is_directory) { + (void) mg_snprintf(de->conn, size, sizeof(size), "%s", "[DIRECTORY]"); + } else { + // We use (signed) cast below because MSVC 6 compiler cannot + // convert unsigned __int64 to double. Sigh. + if (de->st.size < 1024) { + (void) mg_snprintf(de->conn, size, sizeof(size), + "%lu", (unsigned long) de->st.size); + } else if (de->st.size < 1024 * 1024) { + (void) mg_snprintf(de->conn, size, sizeof(size), + "%.1fk", (double) de->st.size / 1024.0); + } else if (de->st.size < 1024 * 1024 * 1024) { + (void) mg_snprintf(de->conn, size, sizeof(size), + "%.1fM", (double) de->st.size / 1048576); + } else { + (void) mg_snprintf(de->conn, size, sizeof(size), + "%.1fG", (double) de->st.size / 1073741824); + } + } + (void) strftime(mod, sizeof(mod), "%d-%b-%Y %H:%M", localtime(&de->st.mtime)); + url_encode(de->file_name, href, sizeof(href)); + de->conn->num_bytes_sent += mg_printf(de->conn, + "%s%s" + " %s  %s\n", + de->conn->request_info.uri, href, de->st.is_directory ? "/" : "", + de->file_name, de->st.is_directory ? "/" : "", mod, size); +} + +// This function is called from send_directory() and used for +// sorting directory entries by size, or name, or modification time. +// On windows, __cdecl specification is needed in case if project is built +// with __stdcall convention. qsort always requires __cdels callback. +static int WINCDECL compare_dir_entries(const void *p1, const void *p2) { + const struct de *a = (struct de *) p1, *b = (struct de *) p2; + const char *query_string = a->conn->request_info.query_string; + int cmp_result = 0; + + if (query_string == NULL) { + query_string = "na"; + } + + if (a->st.is_directory && !b->st.is_directory) { + return -1; // Always put directories on top + } else if (!a->st.is_directory && b->st.is_directory) { + return 1; // Always put directories on top + } else if (*query_string == 'n') { + cmp_result = strcmp(a->file_name, b->file_name); + } else if (*query_string == 's') { + cmp_result = a->st.size == b->st.size ? 0 : + a->st.size > b->st.size ? 1 : -1; + } else if (*query_string == 'd') { + cmp_result = a->st.mtime == b->st.mtime ? 0 : + a->st.mtime > b->st.mtime ? 1 : -1; + } + + return query_string[1] == 'd' ? -cmp_result : cmp_result; +} + +static void handle_directory_request(struct mg_connection *conn, + const char *dir) { + struct dirent *dp; + DIR *dirp; + struct de *entries = NULL; + char path[PATH_MAX]; + int i, sort_direction, num_entries = 0, arr_size = 128; + + if ((dirp = opendir(dir)) == NULL) { + send_http_error(conn, 500, "Cannot open directory", + "Error: opendir(%s): %s", path, strerror(ERRNO)); + return; + } + + (void) mg_printf(conn, "%s", + "HTTP/1.1 200 OK\r\n" + "Connection: close\r\n" + "Content-Type: text/html; charset=utf-8\r\n\r\n"); + + sort_direction = conn->request_info.query_string != NULL && + conn->request_info.query_string[1] == 'd' ? 'a' : 'd'; + + while ((dp = readdir(dirp)) != NULL) { + + // Do not show current dir and passwords file + if (!strcmp(dp->d_name, ".") || + !strcmp(dp->d_name, "..") || + !strcmp(dp->d_name, PASSWORDS_FILE_NAME)) + continue; + + if (entries == NULL || num_entries >= arr_size) { + arr_size *= 2; + entries = (struct de *) realloc(entries, + arr_size * sizeof(entries[0])); + } + + if (entries == NULL) { + send_http_error(conn, 500, "Cannot open directory", + "%s", "Error: cannot allocate memory"); + closedir(dirp); + return; + } + + mg_snprintf(conn, path, sizeof(path), "%s%c%s", dir, DIRSEP, dp->d_name); + + // If we don't memset stat structure to zero, mtime will have + // garbage and strftime() will segfault later on in + // print_dir_entry(). memset is required only if mg_stat() + // fails. For more details, see + // http://code.google.com/p/mongoose/issues/detail?id=79 + if (mg_stat(path, &entries[num_entries].st) != 0) { + memset(&entries[num_entries].st, 0, sizeof(entries[num_entries].st)); + } + + entries[num_entries].conn = conn; + entries[num_entries].file_name = mg_strdup(dp->d_name); + num_entries++; + } + (void) closedir(dirp); + + conn->num_bytes_sent += mg_printf(conn, + "Index of %s" + "" + "

Index of %s

"
+      ""
+      ""
+      ""
+      "",
+      conn->request_info.uri, conn->request_info.uri,
+      sort_direction, sort_direction, sort_direction);
+
+  // Print first entry - link to a parent directory
+  conn->num_bytes_sent += mg_printf(conn,
+      ""
+      "\n",
+      conn->request_info.uri, "..", "Parent directory", "-", "-");
+
+  // Sort and print directory entries
+  if(entries!=NULL){
+	  qsort(entries, num_entries, sizeof(entries[0]), compare_dir_entries);
+	  for (i = 0; i < num_entries; i++) {
+		  print_dir_entry(&entries[i]);
+		  free(entries[i].file_name);
+	  }
+	  free(entries);
+  }
+
+  conn->num_bytes_sent += mg_printf(conn, "%s", "
NameModifiedSize
%s %s  %s
");
+  conn->request_info.status_code = 200;
+}
+
+// Send len bytes from the opened file to the client.
+static void send_file_data(struct mg_connection *conn, FILE *fp, int64_t len) {
+  char buf[BUFSIZ];
+  int to_read, num_read, num_written;
+
+  while (len > 0) {
+    // Calculate how much to read from the file in the buffer
+    to_read = sizeof(buf);
+    if ((int64_t) to_read > len)
+      to_read = (int) len;
+
+    // Read from file, exit the loop on error
+    if ((num_read = fread(buf, 1, to_read, fp)) == 0)
+      break;
+
+    // Send read bytes to the client, exit the loop on error
+    if ((num_written = mg_write(conn, buf, num_read)) != num_read)
+      break;
+
+    // Both read and were successful, adjust counters
+    conn->num_bytes_sent += num_written;
+    len -= num_written;
+  }
+}
+
+static int parse_range_header(const char *header, int64_t *a, int64_t *b) {
+  return sscanf(header, "bytes=%" INT64_FMT "-%" INT64_FMT, a, b);
+}
+
+static void handle_file_request(struct mg_connection *conn, const char *path,
+                                struct mgstat *stp) {
+  char date[64], lm[64], etag[64], range[64];
+  const char *fmt = "%a, %d %b %Y %H:%M:%S %Z", *msg = "OK", *hdr;
+  time_t curtime = time(NULL);
+  int64_t cl, r1, r2;
+  struct vec mime_vec;
+  FILE *fp;
+  int n;
+
+  get_mime_type(conn->ctx, path, &mime_vec);
+  cl = stp->size;
+  conn->request_info.status_code = 200;
+  range[0] = '\0';
+
+  if ((fp = mg_fopen(path, "rb")) == NULL) {
+    send_http_error(conn, 500, http_500_error,
+        "fopen(%s): %s", path, strerror(ERRNO));
+    return;
+  }
+  set_close_on_exec(fileno(fp));
+
+  // If Range: header specified, act accordingly
+  r1 = r2 = 0;
+  hdr = mg_get_header(conn, "Range");
+  if (hdr != NULL && (n = parse_range_header(hdr, &r1, &r2)) > 0) {
+    conn->request_info.status_code = 206;
+    (void) fseeko(fp, (off_t) r1, SEEK_SET);
+    cl = n == 2 ? r2 - r1 + 1: cl - r1;
+    (void) mg_snprintf(conn, range, sizeof(range),
+        "Content-Range: bytes "
+        "%" INT64_FMT "-%"
+        INT64_FMT "/%" INT64_FMT "\r\n",
+        r1, r1 + cl - 1, stp->size);
+    msg = "Partial Content";
+  }
+
+  // Prepare Etag, Date, Last-Modified headers
+  (void) strftime(date, sizeof(date), fmt, localtime(&curtime));
+  (void) strftime(lm, sizeof(lm), fmt, localtime(&stp->mtime));
+  (void) mg_snprintf(conn, etag, sizeof(etag), "%lx.%lx",
+      (unsigned long) stp->mtime, (unsigned long) stp->size);
+
+  (void) mg_printf(conn,
+      "HTTP/1.1 %d %s\r\n"
+      "Date: %s\r\n"
+      "Last-Modified: %s\r\n"
+      "Etag: \"%s\"\r\n"
+      "Content-Type: %.*s\r\n"
+      "Content-Length: %" INT64_FMT "\r\n"
+      "Connection: %s\r\n"
+      "Accept-Ranges: bytes\r\n"
+      "%s\r\n",
+      conn->request_info.status_code, msg, date, lm, etag,
+      mime_vec.len, mime_vec.ptr, cl, suggest_connection_header(conn), range);
+
+  if (strcmp(conn->request_info.request_method, "HEAD") != 0) {
+    send_file_data(conn, fp, cl);
+  }
+  (void) fclose(fp);
+}
+
+// Parse HTTP headers from the given buffer, advance buffer to the point
+// where parsing stopped.
+static void parse_http_headers(char **buf, struct mg_request_info *ri) {
+  int i;
+
+  for (i = 0; i < (int) ARRAY_SIZE(ri->http_headers); i++) {
+    ri->http_headers[i].name = skip(buf, ": ");
+    ri->http_headers[i].value = skip(buf, "\r\n");
+    if (ri->http_headers[i].name[0] == '\0')
+      break;
+    ri->num_headers = i + 1;
+  }
+}
+
+static int is_valid_http_method(const char *method) {
+  return !strcmp(method, "GET") || !strcmp(method, "POST") ||
+    !strcmp(method, "HEAD") || !strcmp(method, "CONNECT") ||
+    !strcmp(method, "PUT") || !strcmp(method, "DELETE");
+}
+
+// Parse HTTP request, fill in mg_request_info structure.
+static int parse_http_request(char *buf, struct mg_request_info *ri) {
+  int status = 0;
+
+  // RFC says that all initial whitespaces should be ingored
+  while (*buf != '\0' && isspace(* (unsigned char *) buf)) {
+    buf++;
+  }
+
+  ri->request_method = skip(&buf, " ");
+  ri->uri = skip(&buf, " ");
+  ri->http_version = skip(&buf, "\r\n");
+
+  if (is_valid_http_method(ri->request_method) &&
+      strncmp(ri->http_version, "HTTP/", 5) == 0) {
+    ri->http_version += 5;   /* Skip "HTTP/" */
+    parse_http_headers(&buf, ri);
+    status = 1;
+  }
+
+  return status;
+}
+
+// Keep reading the input (either opened file descriptor fd, or socket sock,
+// or SSL descriptor ssl) into buffer buf, until \r\n\r\n appears in the
+// buffer (which marks the end of HTTP request). Buffer buf may already
+// have some data. The length of the data is stored in nread.
+// Upon every read operation, increase nread by the number of bytes read.
+static int read_request(FILE *fp, SOCKET sock, SSL *ssl, char *buf, int bufsiz,
+                        int *nread) {
+  int n, request_len;
+
+  request_len = 0;
+  while (*nread < bufsiz && request_len == 0) {
+    n = pull(fp, sock, ssl, buf + *nread, bufsiz - *nread);
+    if (n <= 0) {
+      break;
+    } else {
+      *nread += n;
+      request_len = get_request_len(buf, *nread);
+    }
+  }
+
+  return request_len;
+}
+
+// For given directory path, substitute it to valid index file.
+// Return 0 if index file has been found, -1 if not found.
+// If the file is found, it's stats is returned in stp.
+static int substitute_index_file(struct mg_connection *conn, char *path,
+                                 size_t path_len, struct mgstat *stp) {
+  const char *list = conn->ctx->config[INDEX_FILES];
+  struct mgstat st;
+  struct vec filename_vec;
+  size_t n = strlen(path);
+  int found = 0;
+
+  // The 'path' given to us points to the directory. Remove all trailing
+  // directory separator characters from the end of the path, and
+  // then append single directory separator character.
+  while (n > 0 && IS_DIRSEP_CHAR(path[n - 1])) {
+    n--;
+  }
+  path[n] = DIRSEP;
+
+  // Traverse index files list. For each entry, append it to the given
+  // path and see if the file exists. If it exists, break the loop
+  while ((list = next_option(list, &filename_vec, NULL)) != NULL) {
+
+    // Ignore too long entries that may overflow path buffer
+    if (filename_vec.len > path_len - n)
+      continue;
+
+    // Prepare full path to the index file
+    (void) mg_strlcpy(path + n + 1, filename_vec.ptr, filename_vec.len + 1);
+
+    // Does it exist?
+    if (mg_stat(path, &st) == 0) {
+      // Yes it does, break the loop
+      *stp = st;
+      found = 1;
+      break;
+    }
+  }
+
+  // If no index file exists, restore directory path
+  if (!found) {
+    path[n] = '\0';
+  }
+
+  return found;
+}
+
+// Return True if we should reply 304 Not Modified.
+static int is_not_modified(const struct mg_connection *conn,
+                           const struct mgstat *stp) {
+  const char *ims = mg_get_header(conn, "If-Modified-Since");
+  return ims != NULL && stp->mtime <= parse_date_string(ims);
+}
+
+static int forward_body_data(struct mg_connection *conn, FILE *fp,
+                             SOCKET sock, SSL *ssl) {
+  const char *expect, *buffered;
+  char buf[BUFSIZ];
+  int to_read, nread, buffered_len, success = 0;
+
+  expect = mg_get_header(conn, "Expect");
+  assert(fp != NULL);
+
+  if (conn->content_len == -1) {
+    send_http_error(conn, 411, "Length Required", "");
+  } else if (expect != NULL && mg_strcasecmp(expect, "100-continue")) {
+    send_http_error(conn, 417, "Expectation Failed", "");
+  } else {
+    if (expect != NULL) {
+      (void) mg_printf(conn, "%s", "HTTP/1.1 100 Continue\r\n\r\n");
+    }
+
+    buffered = conn->buf + conn->request_len;
+    buffered_len = conn->data_len - conn->request_len;
+    assert(buffered_len >= 0);
+    assert(conn->consumed_content == 0);
+
+    if (buffered_len > 0) {
+      if ((int64_t) buffered_len > conn->content_len) {
+        buffered_len = (int) conn->content_len;
+      }
+      push(fp, sock, ssl, buffered, (int64_t) buffered_len);
+      conn->consumed_content += buffered_len;
+    }
+
+    while (conn->consumed_content < conn->content_len) {
+      to_read = sizeof(buf);
+      if ((int64_t) to_read > conn->content_len - conn->consumed_content) {
+        to_read = (int) (conn->content_len - conn->consumed_content);
+      }
+      nread = pull(NULL, conn->client.sock, conn->ssl, buf, to_read);
+      if (nread <= 0 || push(fp, sock, ssl, buf, nread) != nread) {
+        break;
+      }
+      conn->consumed_content += nread;
+    }
+
+    if (conn->consumed_content == conn->content_len) {
+      success = 1;
+    }
+
+    // Each error code path in this function must send an error
+    if (!success) {
+      send_http_error(conn, 577, http_500_error, "");
+    }
+  }
+
+  return success;
+}
+
+#if !defined(NO_CGI)
+// This structure helps to create an environment for the spawned CGI program.
+// Environment is an array of "VARIABLE=VALUE\0" ASCIIZ strings,
+// last element must be NULL.
+// However, on Windows there is a requirement that all these VARIABLE=VALUE\0
+// strings must reside in a contiguous buffer. The end of the buffer is
+// marked by two '\0' characters.
+// We satisfy both worlds: we create an envp array (which is vars), all
+// entries are actually pointers inside buf.
+struct cgi_env_block {
+  struct mg_connection *conn;
+  char buf[CGI_ENVIRONMENT_SIZE]; // Environment buffer
+  int len; // Space taken
+  char *vars[MAX_CGI_ENVIR_VARS]; // char **envp
+  int nvars; // Number of variables
+};
+
+// Append VARIABLE=VALUE\0 string to the buffer, and add a respective
+// pointer into the vars array.
+static char *addenv(struct cgi_env_block *block, const char *fmt, ...) {
+  int n, space;
+  char *added;
+  va_list ap;
+
+  // Calculate how much space is left in the buffer
+  space = sizeof(block->buf) - block->len - 2;
+  assert(space >= 0);
+
+  // Make a pointer to the free space int the buffer
+  added = block->buf + block->len;
+
+  // Copy VARIABLE=VALUE\0 string into the free space
+  va_start(ap, fmt);
+  n = mg_vsnprintf(block->conn, added, (size_t) space, fmt, ap);
+  va_end(ap);
+
+  // Make sure we do not overflow buffer and the envp array
+  if (n > 0 && n < space &&
+      block->nvars < (int) ARRAY_SIZE(block->vars) - 2) {
+    // Append a pointer to the added string into the envp array
+    block->vars[block->nvars++] = block->buf + block->len;
+    // Bump up used length counter. Include \0 terminator
+    block->len += n + 1;
+  }
+
+  return added;
+}
+
+static void prepare_cgi_environment(struct mg_connection *conn,
+                                    const char *prog,
+                                    struct cgi_env_block *blk) {
+  const char *s, *slash;
+  struct vec var_vec, root;
+  char *p;
+  int  i;
+
+  blk->len = blk->nvars = 0;
+  blk->conn = conn;
+
+  get_document_root(conn, &root);
+
+  addenv(blk, "SERVER_NAME=%s", conn->ctx->config[AUTHENTICATION_DOMAIN]);
+  addenv(blk, "SERVER_ROOT=%.*s", root.len, root.ptr);
+  addenv(blk, "DOCUMENT_ROOT=%.*s", root.len, root.ptr);
+
+  // Prepare the environment block
+  addenv(blk, "%s", "GATEWAY_INTERFACE=CGI/1.1");
+  addenv(blk, "%s", "SERVER_PROTOCOL=HTTP/1.1");
+  addenv(blk, "%s", "REDIRECT_STATUS=200"); // For PHP
+  addenv(blk, "SERVER_PORT=%d", ntohs(conn->client.lsa.u.sin.sin_port));
+  addenv(blk, "REQUEST_METHOD=%s", conn->request_info.request_method);
+  addenv(blk, "REMOTE_ADDR=%s",
+      inet_ntoa(conn->client.rsa.u.sin.sin_addr));
+  addenv(blk, "REMOTE_PORT=%d", conn->request_info.remote_port);
+  addenv(blk, "REQUEST_URI=%s", conn->request_info.uri);
+
+  // SCRIPT_NAME
+  assert(conn->request_info.uri[0] == '/');
+  slash = strrchr(conn->request_info.uri, '/');
+  if ((s = strrchr(prog, '/')) == NULL)
+    s = prog;
+  addenv(blk, "SCRIPT_NAME=%.*s%s", slash - conn->request_info.uri,
+         conn->request_info.uri, s);
+
+  addenv(blk, "SCRIPT_FILENAME=%s", prog);
+  addenv(blk, "PATH_TRANSLATED=%s", prog);
+  addenv(blk, "HTTPS=%s", conn->ssl == NULL ? "off" : "on");
+
+  if ((s = mg_get_header(conn, "Content-Type")) != NULL)
+    addenv(blk, "CONTENT_TYPE=%s", s);
+
+  if (conn->request_info.query_string != NULL)
+    addenv(blk, "QUERY_STRING=%s", conn->request_info.query_string);
+
+  if ((s = mg_get_header(conn, "Content-Length")) != NULL)
+    addenv(blk, "CONTENT_LENGTH=%s", s);
+
+  if ((s = getenv("PATH")) != NULL)
+    addenv(blk, "PATH=%s", s);
+
+#if defined(_WIN32)
+  if ((s = getenv("COMSPEC")) != NULL)
+    addenv(blk, "COMSPEC=%s", s);
+  if ((s = getenv("SYSTEMROOT")) != NULL)
+    addenv(blk, "SYSTEMROOT=%s", s);
+#else
+  if ((s = getenv("LD_LIBRARY_PATH")) != NULL)
+    addenv(blk, "LD_LIBRARY_PATH=%s", s);
+#endif /* _WIN32 */
+
+  if ((s = getenv("PERLLIB")) != NULL)
+    addenv(blk, "PERLLIB=%s", s);
+
+  if (conn->request_info.remote_user != NULL) {
+    addenv(blk, "REMOTE_USER=%s", conn->request_info.remote_user);
+    addenv(blk, "%s", "AUTH_TYPE=Digest");
+  }
+
+  // Add all headers as HTTP_* variables
+  for (i = 0; i < conn->request_info.num_headers; i++) {
+    p = addenv(blk, "HTTP_%s=%s",
+        conn->request_info.http_headers[i].name,
+        conn->request_info.http_headers[i].value);
+
+    // Convert variable name into uppercase, and change - to _
+    for (; *p != '=' && *p != '\0'; p++) {
+      if (*p == '-')
+        *p = '_';
+      *p = (char) toupper(* (unsigned char *) p);
+    }
+  }
+
+  // Add user-specified variables
+  s = conn->ctx->config[CGI_ENVIRONMENT];
+  while ((s = next_option(s, &var_vec, NULL)) != NULL) {
+    addenv(blk, "%.*s", var_vec.len, var_vec.ptr);
+  }
+
+  blk->vars[blk->nvars++] = NULL;
+  blk->buf[blk->len++] = '\0';
+
+  assert(blk->nvars < (int) ARRAY_SIZE(blk->vars));
+  assert(blk->len > 0);
+  assert(blk->len < (int) sizeof(blk->buf));
+}
+
+static void handle_cgi_request(struct mg_connection *conn, const char *prog) {
+  int headers_len, data_len, i, fd_stdin[2], fd_stdout[2];
+  const char *status;
+  char buf[BUFSIZ], *pbuf, dir[PATH_MAX], *p;
+  struct mg_request_info ri;
+  struct cgi_env_block blk;
+  FILE *in, *out;
+  pid_t pid;
+
+  prepare_cgi_environment(conn, prog, &blk);
+
+  // CGI must be executed in i