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mongoose.c
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mongoose.c
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// Copyright (c) 2004-2012 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 // For flockfile() on Linux
#define _LARGEFILE_SOURCE // Enable 64-bit file offsets
#define __STDC_FORMAT_MACROS // <inttypes.h> wants this for C++
#define __STDC_LIMIT_MACROS // C++ wants that for INT64_MAX
#endif
#if defined(__SYMBIAN32__)
#define NO_SSL // SSL is not supported
#define NO_CGI // CGI is not supported
#define PATH_MAX FILENAME_MAX
#endif // __SYMBIAN32__
#ifndef _WIN32_WCE // Some ANSI #includes are not available on Windows CE
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <signal.h>
#include <fcntl.h>
#endif // !_WIN32_WCE
#include <time.h>
#include <stdlib.h>
#include <stdarg.h>
#include <assert.h>
#include <string.h>
#include <ctype.h>
#include <limits.h>
#include <stddef.h>
#include <stdio.h>
#if defined(_WIN32) && !defined(__SYMBIAN32__) // Windows specific
#define _WIN32_WINNT 0x0400 // To make it link in VS2005
#include <windows.h>
#ifndef PATH_MAX
#define PATH_MAX MAX_PATH
#endif
#ifndef _WIN32_WCE
#include <process.h>
#include <direct.h>
#include <io.h>
#else // _WIN32_WCE
#include <winsock2.h>
#include <ws2tcpip.h>
#define NO_CGI // WinCE has no pipes
typedef long off_t;
#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 mg_sleep(x) Sleep(x)
#define pipe(x) _pipe(x, MG_BUF_LEN, _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) _lseeki64(_fileno(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) EnterCriticalSection(&global_log_file_lock)
#define funlockfile(x) LeaveCriticalSection(&global_log_file_lock)
#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 <stdint.h>
#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 <sys/wait.h>
#include <sys/socket.h>
#include <sys/select.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/time.h>
#include <stdint.h>
#include <inttypes.h>
#include <netdb.h>
#include <pwd.h>
#include <unistd.h>
#include <dirent.h>
#if !defined(NO_SSL_DL) && !defined(NO_SSL)
#include <dlfcn.h>
#endif
#include <pthread.h>
#if defined(__MACH__)
#define SSL_LIB "libssl.dylib"
#define CRYPTO_LIB "libcrypto.dylib"
#else
#if !defined(SSL_LIB)
#define SSL_LIB "libssl.so"
#endif
#if !defined(CRYPTO_LIB)
#define CRYPTO_LIB "libcrypto.so"
#endif
#endif
#define DIRSEP '/'
#define IS_DIRSEP_CHAR(c) ((c) == '/')
#ifndef O_BINARY
#define O_BINARY 0
#endif // O_BINARY
#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 mg_sleep(x) usleep((x) * 1000)
#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 "3.3"
#define PASSWORDS_FILE_NAME ".htpasswd"
#define CGI_ENVIRONMENT_SIZE 4096
#define MAX_CGI_ENVIR_VARS 64
#define MG_BUF_LEN 8192
#define ARRAY_SIZE(array) (sizeof(array) / sizeof(array[0]))
#ifdef _WIN32
static CRITICAL_SECTION global_log_file_lock;
static pthread_t pthread_self(void) {
return GetCurrentThreadId();
}
#endif // _WIN32
#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
#define _DARWIN_UNLIMITED_SELECT
#if !defined(MSG_NOSIGNAL)
#define MSG_NOSIGNAL 0
#endif
#if !defined(SOMAXCONN)
#define SOMAXCONN 100
#endif
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 SSL_METHOD *SSLv23_client_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_t);
extern void SSL_CTX_free(SSL_CTX *);
extern int SSL_CTX_set_cipher_list(SSL_CTX *ctx, const char *str);
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].ptr)
#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_t)) 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 SSLv23_client_method (* (SSL_METHOD * (*)(void)) ssl_sw[17].ptr)
#define SSL_CTX_set_cipher_list \
(* (int (*)(SSL_CTX *, const char *)) ssl_sw[18].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)) crypto_sw[3].ptr)
#define ERR_error_string (* (char * (*)(unsigned long,char *)) crypto_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},
{"SSLv23_client_method", NULL},
{"SSL_CTX_set_cipher_list", NULL},
{NULL, NULL}
};
// Similar array as ssl_sw. These functions could be located in different lib.
#if !defined(NO_SSL)
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
#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.
union usa {
struct sockaddr sa;
struct sockaddr_in sin;
#if defined(USE_IPV6)
struct sockaddr_in6 sin6;
#endif
};
// 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
union usa lsa; // Local socket address
union usa rsa; // Remote socket address
int is_ssl; // Is socket SSL-ed
};
// NOTE(lsm): this enum shoulds be in sync with the config_options below.
enum {
CGI_EXTENSIONS, CGI_ENVIRONMENT, PUT_DELETE_PASSWORDS_FILE, CGI_INTERPRETER,
MAX_REQUEST_SIZE, 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,
EXTRA_MIME_TYPES, LISTENING_PORTS, DOCUMENT_ROOT, SSL_CERTIFICATE,
NUM_THREADS, RUN_AS_USER, REWRITE, HIDE_FILES, SSL_CIPHERS,
NUM_OPTIONS
};
static const char *config_options[] = {
"C", "cgi_pattern", "**.cgi$|**.pl$|**.php$",
"E", "cgi_environment", NULL,
"G", "put_delete_passwords_file", NULL,
"I", "cgi_interpreter", NULL,
"M", "max_request_size", "16384",
"P", "protect_uri", NULL,
"R", "authentication_domain", "mydomain.com",
"S", "ssi_pattern", "**.shtml$|**.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,index.shtml,index.php",
"k", "enable_keep_alive", "no",
"l", "access_control_list", NULL,
"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,
"w", "url_rewrite_patterns", NULL,
"x", "hide_files_patterns", NULL,
"H", "ssl_ciphers", NULL,
NULL
};
#define ENTRIES_PER_CONFIG_OPTION 3
struct mg_context {
volatile int stop_flag; // Should we stop event loop
SSL_CTX *ssl_ctx; // SSL context
SSL_CTX *client_ssl_ctx; // Client SSL context
char *config[NUM_OPTIONS]; // Mongoose configuration parameters
mg_callback_t user_callback; // User-defined callback function
void *user_data; // User-defined data
struct socket *listening_sockets;
volatile 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
volatile int sq_head; // Head of the socket queue
volatile int sq_tail; // Tail of the socket queue
pthread_cond_t sq_full; // Signaled when socket is produced
pthread_cond_t sq_empty; // Signaled when socket is consumed
};
struct mg_connection {
struct mg_request_info request_info;
struct mg_context *ctx;
SSL *ssl; // SSL descriptor
struct socket client; // Connected client
time_t birth_time; // Time when request was received
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 have been read
char *buf; // Buffer for received data
char *path_info; // PATH_INFO part of the URL
char *body; // Pointer to not-read yet buffered body data
char *next_request; // Pointer to the buffered next request
int must_close; // 1 if connection must be closed
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) {
conn->request_info.user_data = conn->ctx->user_data;
return conn->ctx->user_callback == NULL ? NULL :
conn->ctx->user_callback(event, conn);
}
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];
}
}
static void sockaddr_to_string(char *buf, size_t len,
const union usa *usa) {
buf[0] = '\0';
#if defined(USE_IPV6)
inet_ntop(usa->sa.sa_family, usa->sa.sa_family == AF_INET ?
(void *) &usa->sin.sin_addr :
(void *) &usa->sin6.sin6_addr, buf, len);
#elif defined(_WIN32)
// Only Windoze Vista (and newer) have inet_ntop()
strncpy(buf, inet_ntoa(usa->sin.sin_addr), len);
#else
inet_ntop(usa->sa.sa_family, (void *) &usa->sin.sin_addr, buf, len);
#endif
}
// Print error message to the opened error log stream.
static void cry(struct mg_connection *conn, const char *fmt, ...) {
char buf[MG_BUF_LEN], src_addr[20];
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);
sockaddr_to_string(src_addr, sizeof(src_addr), &conn->client.rsa);
fprintf(fp, "[%010lu] [error] [client %s] ", (unsigned long) timestamp,
src_addr);
if (conn->request_info.request_method != NULL) {
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 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;
}
const struct mg_request_info *
mg_get_request_info(const struct mg_connection *conn) {
return &conn->request_info;
}
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(* (const 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 a 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 delimiter and following whitespaces if any.
// Advance pointer to buffer to the next word. Return found 0-terminated word.
// Delimiters can be quoted with quotechar.
static char *skip_quoted(char **buf, const char *delimiters,
const char *whitespace, char quotechar) {
char *p, *begin_word, *end_word, *end_whitespace;
begin_word = *buf;
end_word = begin_word + strcspn(begin_word, delimiters);
// Check for quotechar
if (end_word > begin_word) {
p = end_word - 1;
while (*p == quotechar) {
// If there is anything beyond end_word, copy it
if (*end_word == '\0') {
*p = '\0';
break;
} else {
size_t end_off = strcspn(end_word + 1, delimiters);
memmove (p, end_word, end_off + 1);
p += end_off; // p must correspond to end_word - 1
end_word += end_off + 1;
}
}
for (p++; p < end_word; p++) {
*p = '\0';
}
}
if (*end_word == '\0') {
*buf = end_word;
} else {
end_whitespace = end_word + 1 + strspn(end_word + 1, whitespace);
for (p = end_word; p < end_whitespace; p++) {
*p = '\0';
}
*buf = end_whitespace;
}
return begin_word;
}
// Simplified version of skip_quoted without quote char
// and whitespace == delimiters
static char *skip(char **buf, const char *delimiters) {
return skip_quoted(buf, delimiters, delimiters, 0);
}
// 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 a comma separated list of values.
// It returns a list pointer shifted to the next value, or 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 = (const char *) 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;
}
static int match_prefix(const char *pattern, int pattern_len, const char *str) {
const char *or_str;
int i, j, len, res;
if ((or_str = (const char *) memchr(pattern, '|', pattern_len)) != NULL) {
res = match_prefix(pattern, or_str - pattern, str);
return res > 0 ? res :
match_prefix(or_str + 1, (pattern + pattern_len) - (or_str + 1), str);
}
i = j = 0;
res = -1;
for (; i < pattern_len; i++, j++) {
if (pattern[i] == '?' && str[j] != '\0') {
continue;
} else if (pattern[i] == '$') {
return str[j] == '\0' ? j : -1;
} else if (pattern[i] == '*') {
i++;
if (pattern[i] == '*') {
i++;
len = (int) strlen(str + j);
} else {
len = (int) strcspn(str + j, "/");
}
if (i == pattern_len) {
return j + len;
}
do {
res = match_prefix(pattern + i, pattern_len - i, str + j + len);
} while (res == -1 && len-- > 0);
return res == -1 ? -1 : j + res + len;
} else if (pattern[i] != str[j]) {
return -1;
}
}
return j;
}
// 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");
if (conn->must_close ||
conn->request_info.status_code == 401 ||
mg_strcasecmp(conn->ctx->config[ENABLE_KEEP_ALIVE], "yes") != 0 ||
(header != NULL && mg_strcasecmp(header, "keep-alive") != 0) ||
(header == NULL && http_version && strcmp(http_version, "1.1"))) {
return 0;
}
return 1;
}
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 *, int, const char *,
PRINTF_FORMAT_STRING(const char *fmt), ...)
PRINTF_ARGS(4, 5);
static void send_http_error(struct mg_connection *conn, int status,
const char *reason, const char *fmt, ...) {
char buf[MG_BUF_LEN];
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);
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);
}
}
#if defined(_WIN32) && !defined(__SYMBIAN32__)
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 WaitForSingleObject(*mutex, INFINITE) == WAIT_OBJECT_0? 0 : -1;
}
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;
}
// 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], buf2[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);
wbuf[0] = L'\0';
} else {
// Convert to Unicode and back. If doubly-converted string does not
// match the original, something is fishy, reject.
memset(wbuf, 0, wbuf_len * sizeof(wchar_t));
MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, (int) wbuf_len);
WideCharToMultiByte(CP_UTF8, 0, wbuf, (int) wbuf_len, buf2, sizeof(buf2),
NULL, NULL);
if (strcmp(buf, buf2) != 0) {
wbuf[0] = L'\0';
}
}
}
#if defined(_WIN32_WCE)
static time_t time(time_t *ptime) {
time_t t;