/* vi: set sw=4 ts=4: */ /* * httpd implementation for busybox * * Copyright (C) 2002,2003 Glenn Engel * Copyright (C) 2003-2006 Vladimir Oleynik * * simplify patch stolen from libbb without using strdup * * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. * ***************************************************************************** * * Typical usage: * for non root user * httpd -p 8080 -h $HOME/public_html * or for daemon start from rc script with uid=0: * httpd -u www * This is equivalent if www user have uid=80 to * httpd -p 80 -u 80 -h /www -c /etc/httpd.conf -r "Web Server Authentication" * * * When a url contains "cgi-bin" it is assumed to be a cgi script. The * server changes directory to the location of the script and executes it * after setting QUERY_STRING and other environment variables. * * The server can also be invoked as a url arg decoder and html text encoder * as follows: * foo=`httpd -d $foo` # decode "Hello%20World" as "Hello World" * bar=`httpd -e ""` # encode as "<Hello World>" * Note that url encoding for arguments is not the same as html encoding for * presentation. -d decodes a url-encoded argument while -e encodes in html * for page display. * * httpd.conf has the following format: * * A:172.20. # Allow address from 172.20.0.0/16 * A:10.0.0.0/25 # Allow any address from 10.0.0.0-10.0.0.127 * A:10.0.0.0/255.255.255.128 # Allow any address that previous set * A:127.0.0.1 # Allow local loopback connections * D:* # Deny from other IP connections * /cgi-bin:foo:bar # Require user foo, pwd bar on urls starting with /cgi-bin/ * /adm:admin:setup # Require user admin, pwd setup on urls starting with /adm/ * /adm:toor:PaSsWd # or user toor, pwd PaSsWd on urls starting with /adm/ * .au:audio/basic # additional mime type for audio.au files * *.php:/path/php # running cgi.php scripts through an interpreter * * A/D may be as a/d or allow/deny - first char case insensitive * Deny IP rules take precedence over allow rules. * * * The Deny/Allow IP logic: * * - Default is to allow all. No addresses are denied unless * denied with a D: rule. * - Order of Deny/Allow rules is significant * - Deny rules take precedence over allow rules. * - If a deny all rule (D:*) is used it acts as a catch-all for unmatched * addresses. * - Specification of Allow all (A:*) is a no-op * * Example: * 1. Allow only specified addresses * A:172.20 # Allow any address that begins with 172.20. * A:10.10. # Allow any address that begins with 10.10. * A:127.0.0.1 # Allow local loopback connections * D:* # Deny from other IP connections * * 2. Only deny specified addresses * D:1.2.3. # deny from 1.2.3.0 - 1.2.3.255 * D:2.3.4. # deny from 2.3.4.0 - 2.3.4.255 * A:* # (optional line added for clarity) * * If a sub directory contains a config file it is parsed and merged with * any existing settings as if it was appended to the original configuration. * * subdir paths are relative to the containing subdir and thus cannot * affect the parent rules. * * Note that since the sub dir is parsed in the forked thread servicing the * subdir http request, any merge is discarded when the process exits. As a * result, the subdir settings only have a lifetime of a single request. * * * If -c is not set, an attempt will be made to open the default * root configuration file. If -c is set and the file is not found, the * server exits with an error. * */ #include #include /* for isspace */ #include #include /* for malloc */ #include #include /* for close */ #include #include #include /* for connect and socket*/ #include /* for sockaddr_in */ #include #include #include #include /* for open modes */ #include "busybox.h" static const char httpdVersion[] = "busybox httpd/1.35 6-Oct-2004"; static const char default_path_httpd_conf[] = "/etc"; static const char httpd_conf[] = "httpd.conf"; static const char home[] = "./"; #ifdef CONFIG_LFS # define cont_l_fmt "%lld" # define cont_l_type (long long) #else # define cont_l_fmt "%ld" # define cont_l_type (long) #endif #define TIMEOUT 60 // Note: busybox xfuncs are not used because we want the server to keep running // if something bad happens due to a malformed user request. // As a result, all memory allocation after daemonize // is checked rigorously //#define DEBUG 1 /* Configure options, disabled by default as custom httpd feature */ /* disabled as optional features */ //#define CONFIG_FEATURE_HTTPD_ENCODE_URL_STR //#define CONFIG_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV //#define CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES //#define CONFIG_FEATURE_HTTPD_SETUID //#define CONFIG_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP /* If set, use this server from internet superserver only */ //#define CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY /* You can use this server as standalone, require libbb.a for linking */ //#define HTTPD_STANDALONE /* Config options, disable this for do very small module */ //#define CONFIG_FEATURE_HTTPD_CGI //#define CONFIG_FEATURE_HTTPD_BASIC_AUTH //#define CONFIG_FEATURE_HTTPD_AUTH_MD5 #ifdef HTTPD_STANDALONE /* standalone, enable all features */ #undef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY /* unset config option for remove warning as redefined */ #undef CONFIG_FEATURE_HTTPD_BASIC_AUTH #undef CONFIG_FEATURE_HTTPD_AUTH_MD5 #undef CONFIG_FEATURE_HTTPD_ENCODE_URL_STR #undef CONFIG_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV #undef CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES #undef CONFIG_FEATURE_HTTPD_CGI #undef CONFIG_FEATURE_HTTPD_SETUID #undef CONFIG_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP #undef ENABLE_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY #undef ENABLE_FEATURE_HTTPD_BASIC_AUTH #undef ENABLE_FEATURE_HTTPD_AUTH_MD5 #undef ENABLE_FEATURE_HTTPD_ENCODE_URL_STR #undef ENABLE_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV #undef ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES #undef ENABLE_FEATURE_HTTPD_CGI #undef ENABLE_FEATURE_HTTPD_SETUID #undef ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP /* enable all features now */ #define CONFIG_FEATURE_HTTPD_BASIC_AUTH #define CONFIG_FEATURE_HTTPD_AUTH_MD5 #define CONFIG_FEATURE_HTTPD_ENCODE_URL_STR #define CONFIG_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV #define CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES #define CONFIG_FEATURE_HTTPD_CGI #define CONFIG_FEATURE_HTTPD_SETUID #define CONFIG_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP #define ENABLE_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY 0 #define ENABLE_FEATURE_HTTPD_BASIC_AUTH 1 #define ENABLE_FEATURE_HTTPD_AUTH_MD5 1 #define ENABLE_FEATURE_HTTPD_ENCODE_URL_STR 1 #define ENABLE_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV 1 #define ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES 1 #define ENABLE_FEATURE_HTTPD_CGI 1 #define ENABLE_FEATURE_HTTPD_SETUID 1 #define ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP 1 /* require from libbb.a for linking */ const char *bb_applet_name = "httpd"; void bb_show_usage(void) { fprintf(stderr, "Usage: %s [-p ] [-c configFile] [-d/-e ] " "[-r realm] [-u user] [-h homedir]\n", bb_applet_name); exit(1); } #endif #ifdef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY #undef CONFIG_FEATURE_HTTPD_SETUID /* use inetd user.group config settings */ #undef CONFIG_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP /* so is not daemon */ /* inetd set stderr to accepted socket and we can`t true see debug messages */ #undef DEBUG #endif #ifndef DEBUG # define DEBUG 0 #endif #define MAX_MEMORY_BUFF 8192 /* IO buffer */ typedef struct HT_ACCESS { char *after_colon; struct HT_ACCESS *next; char before_colon[1]; /* really bigger, must last */ } Htaccess; typedef struct HT_ACCESS_IP { unsigned int ip; unsigned int mask; int allow_deny; struct HT_ACCESS_IP *next; } Htaccess_IP; typedef struct { char buf[MAX_MEMORY_BUFF]; USE_FEATURE_HTTPD_BASIC_AUTH(const char *realm;) USE_FEATURE_HTTPD_BASIC_AUTH(char *remoteuser;) const char *query; USE_FEATURE_HTTPD_CGI(char *referer;) const char *configFile; unsigned int rmt_ip; #if ENABLE_FEATURE_HTTPD_CGI || DEBUG char rmt_ip_str[16]; /* for set env REMOTE_ADDR */ #endif unsigned port; /* server initial port and for set env REMOTE_PORT */ union HTTPD_FOUND { const char *found_mime_type; const char *found_moved_temporarily; } httpd_found; off_t ContentLength; /* -1 - unknown */ time_t last_mod; Htaccess_IP *ip_a_d; /* config allow/deny lines */ int flg_deny_all; #ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH Htaccess *auth; /* config user:password lines */ #endif #ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES Htaccess *mime_a; /* config mime types */ #endif #ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY int accepted_socket; # define a_c_r config->accepted_socket # define a_c_w config->accepted_socket #else # define a_c_r 0 # define a_c_w 1 #endif volatile int alarm_signaled; #ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR Htaccess *script_i; /* config script interpreters */ #endif } HttpdConfig; static HttpdConfig *config; static const char request_GET[] = "GET"; /* size algorithic optimize */ static const char* const suffixTable [] = { /* Warning: shorted equivalent suffix in one line must be first */ ".htm.html", "text/html", ".jpg.jpeg", "image/jpeg", ".gif", "image/gif", ".png", "image/png", ".txt.h.c.cc.cpp", "text/plain", ".css", "text/css", ".wav", "audio/wav", ".avi", "video/x-msvideo", ".qt.mov", "video/quicktime", ".mpe.mpeg", "video/mpeg", ".mid.midi", "audio/midi", ".mp3", "audio/mpeg", #if 0 /* unpopular */ ".au", "audio/basic", ".pac", "application/x-ns-proxy-autoconfig", ".vrml.wrl", "model/vrml", #endif 0, "application/octet-stream" /* default */ }; typedef enum { HTTP_OK = 200, HTTP_MOVED_TEMPORARILY = 302, HTTP_BAD_REQUEST = 400, /* malformed syntax */ HTTP_UNAUTHORIZED = 401, /* authentication needed, respond with auth hdr */ HTTP_NOT_FOUND = 404, HTTP_FORBIDDEN = 403, HTTP_REQUEST_TIMEOUT = 408, HTTP_NOT_IMPLEMENTED = 501, /* used for unrecognized requests */ HTTP_INTERNAL_SERVER_ERROR = 500, #if 0 /* future use */ HTTP_CONTINUE = 100, HTTP_SWITCHING_PROTOCOLS = 101, HTTP_CREATED = 201, HTTP_ACCEPTED = 202, HTTP_NON_AUTHORITATIVE_INFO = 203, HTTP_NO_CONTENT = 204, HTTP_MULTIPLE_CHOICES = 300, HTTP_MOVED_PERMANENTLY = 301, HTTP_NOT_MODIFIED = 304, HTTP_PAYMENT_REQUIRED = 402, HTTP_BAD_GATEWAY = 502, HTTP_SERVICE_UNAVAILABLE = 503, /* overload, maintenance */ HTTP_RESPONSE_SETSIZE=0xffffffff #endif } HttpResponseNum; typedef struct { HttpResponseNum type; const char *name; const char *info; } HttpEnumString; static const HttpEnumString httpResponseNames[] = { { HTTP_OK, "OK", NULL }, { HTTP_MOVED_TEMPORARILY, "Found", "Directories must end with a slash." }, { HTTP_REQUEST_TIMEOUT, "Request Timeout", "No request appeared within a reasonable time period." }, { HTTP_NOT_IMPLEMENTED, "Not Implemented", "The requested method is not recognized by this server." }, #ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH { HTTP_UNAUTHORIZED, "Unauthorized", "" }, #endif { HTTP_NOT_FOUND, "Not Found", "The requested URL was not found on this server." }, { HTTP_BAD_REQUEST, "Bad Request", "Unsupported method." }, { HTTP_FORBIDDEN, "Forbidden", "" }, { HTTP_INTERNAL_SERVER_ERROR, "Internal Server Error", "Internal Server Error" }, #if 0 /* not implemented */ { HTTP_CREATED, "Created" }, { HTTP_ACCEPTED, "Accepted" }, { HTTP_NO_CONTENT, "No Content" }, { HTTP_MULTIPLE_CHOICES, "Multiple Choices" }, { HTTP_MOVED_PERMANENTLY, "Moved Permanently" }, { HTTP_NOT_MODIFIED, "Not Modified" }, { HTTP_BAD_GATEWAY, "Bad Gateway", "" }, { HTTP_SERVICE_UNAVAILABLE, "Service Unavailable", "" }, #endif }; static const char RFC1123FMT[] = "%a, %d %b %Y %H:%M:%S GMT"; static const char Content_length[] = "Content-length:"; static int scan_ip (const char **ep, unsigned int *ip, unsigned char endc) { const char *p = *ep; int auto_mask = 8; int j; *ip = 0; for (j = 0; j < 4; j++) { unsigned int octet; if ((*p < '0' || *p > '9') && (*p != '/' || j == 0) && *p != 0) return -auto_mask; octet = 0; while (*p >= '0' && *p <= '9') { octet *= 10; octet += *p - '0'; if (octet > 255) return -auto_mask; p++; } if (*p == '.') p++; if (*p != '/' && *p != 0) auto_mask += 8; *ip = ((*ip) << 8) | octet; } if (*p != 0) { if (*p != endc) return -auto_mask; p++; if(*p == 0) return -auto_mask; } *ep = p; return auto_mask; } static int scan_ip_mask (const char *ipm, unsigned int *ip, unsigned int *mask) { int i; unsigned int msk; i = scan_ip(&ipm, ip, '/'); if(i < 0) return i; if(*ipm) { const char *p = ipm; i = 0; while (*p) { if (*p < '0' || *p > '9') { if (*p == '.') { i = scan_ip (&ipm, mask, 0); return i != 32; } return -1; } i *= 10; i += *p - '0'; p++; } } if (i > 32 || i < 0) return -1; msk = 0x80000000; *mask = 0; while (i > 0) { *mask |= msk; msk >>= 1; i--; } return 0; } #if defined(CONFIG_FEATURE_HTTPD_BASIC_AUTH) || defined(CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES) static void free_config_lines(Htaccess **pprev) { Htaccess *prev = *pprev; while( prev ) { Htaccess *cur = prev; prev = cur->next; free(cur); } *pprev = NULL; } #endif /* flag */ #define FIRST_PARSE 0 #define SUBDIR_PARSE 1 #define SIGNALED_PARSE 2 #define FIND_FROM_HTTPD_ROOT 3 /**************************************************************************** * > $Function: parse_conf() * * $Description: parse configuration file into in-memory linked list. * * The first non-white character is examined to determine if the config line * is one of the following: * .ext:mime/type # new mime type not compiled into httpd * [adAD]:from # ip address allow/deny, * for wildcard * /path:user:pass # username/password * * Any previous IP rules are discarded. * If the flag argument is not SUBDIR_PARSE then all /path and mime rules * are also discarded. That is, previous settings are retained if flag is * SUBDIR_PARSE. * * $Parameters: * (const char *) path . . null for ip address checks, path for password * checks. * (int) flag . . . . . . the source of the parse request. * * $Return: (None) * ****************************************************************************/ static void parse_conf(const char *path, int flag) { FILE *f; #ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH Htaccess *prev, *cur; #elif CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES Htaccess *cur; #endif const char *cf = config->configFile; char buf[160]; char *p0 = NULL; char *c, *p; /* free previous ip setup if present */ Htaccess_IP *pip = config->ip_a_d; while( pip ) { Htaccess_IP *cur_ipl = pip; pip = cur_ipl->next; free(cur_ipl); } config->ip_a_d = NULL; config->flg_deny_all = 0; #if defined(CONFIG_FEATURE_HTTPD_BASIC_AUTH) || defined(CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES) || defined(CONFIG_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR) /* retain previous auth and mime config only for subdir parse */ if(flag != SUBDIR_PARSE) { #ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH free_config_lines(&config->auth); #endif #ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES free_config_lines(&config->mime_a); #endif #ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR free_config_lines(&config->script_i); #endif } #endif if(flag == SUBDIR_PARSE || cf == NULL) { cf = alloca(strlen(path) + sizeof(httpd_conf) + 2); if(cf == NULL) { if(flag == FIRST_PARSE) bb_error_msg_and_die(bb_msg_memory_exhausted); return; } sprintf((char *)cf, "%s/%s", path, httpd_conf); } while((f = fopen(cf, "r")) == NULL) { if(flag == SUBDIR_PARSE || flag == FIND_FROM_HTTPD_ROOT) { /* config file not found, no changes to config */ return; } if(config->configFile && flag == FIRST_PARSE) /* if -c option given */ bb_perror_msg_and_die("%s", cf); flag = FIND_FROM_HTTPD_ROOT; cf = httpd_conf; } #ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH prev = config->auth; #endif /* This could stand some work */ while ( (p0 = fgets(buf, sizeof(buf), f)) != NULL) { c = NULL; for(p = p0; *p0 != 0 && *p0 != '#'; p0++) { if(!isspace(*p0)) { *p++ = *p0; if(*p0 == ':' && c == NULL) c = p; } } *p = 0; /* test for empty or strange line */ if (c == NULL || *c == 0) continue; p0 = buf; if(*p0 == 'd') *p0 = 'D'; if(*c == '*') { if(*p0 == 'D') { /* memorize deny all */ config->flg_deny_all++; } /* skip default other "word:*" config lines */ continue; } if(*p0 == 'a') *p0 = 'A'; else if(*p0 != 'D' && *p0 != 'A' #ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH && *p0 != '/' #endif #ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES && *p0 != '.' #endif #ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR && *p0 != '*' #endif ) continue; if(*p0 == 'A' || *p0 == 'D') { /* storing current config IP line */ pip = calloc(1, sizeof(Htaccess_IP)); if(pip) { if(scan_ip_mask (c, &(pip->ip), &(pip->mask))) { /* syntax IP{/mask} error detected, protect all */ *p0 = 'D'; pip->mask = 0; } pip->allow_deny = *p0; if(*p0 == 'D') { /* Deny:form_IP move top */ pip->next = config->ip_a_d; config->ip_a_d = pip; } else { /* add to bottom A:form_IP config line */ Htaccess_IP *prev_IP = config->ip_a_d; if(prev_IP == NULL) { config->ip_a_d = pip; } else { while(prev_IP->next) prev_IP = prev_IP->next; prev_IP->next = pip; } } } continue; } #ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH if(*p0 == '/') { /* make full path from httpd root / curent_path / config_line_path */ cf = flag == SUBDIR_PARSE ? path : ""; p0 = malloc(strlen(cf) + (c - buf) + 2 + strlen(c)); if(p0 == NULL) continue; c[-1] = 0; sprintf(p0, "/%s%s", cf, buf); /* another call bb_simplify_path */ cf = p = p0; do { if (*p == '/') { if (*cf == '/') { /* skip duplicate (or initial) slash */ continue; } else if (*cf == '.') { if (cf[1] == '/' || cf[1] == 0) { /* remove extra '.' */ continue; } else if ((cf[1] == '.') && (cf[2] == '/' || cf[2] == 0)) { ++cf; if (p > p0) { while (*--p != '/'); /* omit previous dir */ } continue; } } } *++p = *cf; } while (*++cf); if ((p == p0) || (*p != '/')) { /* not a trailing slash */ ++p; /* so keep last character */ } *p = 0; sprintf(p0, "%s:%s", p0, c); } #endif #if defined(CONFIG_FEATURE_HTTPD_BASIC_AUTH) || defined(CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES) || defined(CONFIG_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR) /* storing current config line */ cur = calloc(1, sizeof(Htaccess) + strlen(p0)); if(cur) { cf = strcpy(cur->before_colon, p0); c = strchr(cf, ':'); *c++ = 0; cur->after_colon = c; #ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES if(*cf == '.') { /* config .mime line move top for overwrite previous */ cur->next = config->mime_a; config->mime_a = cur; continue; } #endif #ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR if(*cf == '*' && cf[1] == '.') { /* config script interpreter line move top for overwrite previous */ cur->next = config->script_i; config->script_i = cur; continue; } #endif #ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH free(p0); if(prev == NULL) { /* first line */ config->auth = prev = cur; } else { /* sort path, if current lenght eq or bigger then move up */ Htaccess *prev_hti = config->auth; size_t l = strlen(cf); Htaccess *hti; for(hti = prev_hti; hti; hti = hti->next) { if(l >= strlen(hti->before_colon)) { /* insert before hti */ cur->next = hti; if(prev_hti != hti) { prev_hti->next = cur; } else { /* insert as top */ config->auth = cur; } break; } if(prev_hti != hti) prev_hti = prev_hti->next; } if(!hti) { /* not inserted, add to bottom */ prev->next = cur; prev = cur; } } #endif } #endif } fclose(f); } #ifdef CONFIG_FEATURE_HTTPD_ENCODE_URL_STR /**************************************************************************** * > $Function: encodeString() * * $Description: Given a string, html encode special characters. * This is used for the -e command line option to provide an easy way * for scripts to encode result data without confusing browsers. The * returned string pointer is memory allocated by malloc(). * * $Parameters: * (const char *) string . . The first string to encode. * * $Return: (char *) . . . .. . . A pointer to the encoded string. * * $Errors: Returns a null string ("") if memory is not available. * ****************************************************************************/ static char *encodeString(const char *string) { /* take the simple route and encode everything */ /* could possibly scan once to get length. */ int len = strlen(string); char *out = malloc(len * 6 + 1); char *p=out; char ch; if (!out) return ""; while ((ch = *string++)) { // very simple check for what to encode if (isalnum(ch)) *p++ = ch; else p += sprintf(p, "&#%d;", (unsigned char) ch); } *p=0; return out; } #endif /* CONFIG_FEATURE_HTTPD_ENCODE_URL_STR */ /**************************************************************************** * > $Function: decodeString() * * $Description: Given a URL encoded string, convert it to plain ascii. * Since decoding always makes strings smaller, the decode is done in-place. * Thus, callers should strdup() the argument if they do not want the * argument modified. The return is the original pointer, allowing this * function to be easily used as arguments to other functions. * * $Parameters: * (char *) string . . . The first string to decode. * (int) flag . . . 1 if require decode '+' as ' ' for CGI * * $Return: (char *) . . . . A pointer to the decoded string (same as input). * * $Errors: None * ****************************************************************************/ static char *decodeString(char *orig, int flag_plus_to_space) { /* note that decoded string is always shorter than original */ char *string = orig; char *ptr = string; while (*ptr) { if (*ptr == '+' && flag_plus_to_space) { *string++ = ' '; ptr++; } else if (*ptr != '%') *string++ = *ptr++; else { unsigned int value1, value2; ptr++; if(sscanf(ptr, "%1X", &value1) != 1 || sscanf(ptr+1, "%1X", &value2) != 1) { if(!flag_plus_to_space) return NULL; *string++ = '%'; } else { value1 = value1 * 16 + value2; if(value1 == '/' || value1 == 0) return orig+1; *string++ = value1; ptr += 2; } } } *string = '\0'; return orig; } #ifdef CONFIG_FEATURE_HTTPD_CGI /**************************************************************************** * > $Function: addEnv() * * $Description: Add an environment variable setting to the global list. * A NAME=VALUE string is allocated, filled, and added to the list of * environment settings passed to the cgi execution script. * * $Parameters: * (char *) name_before_underline - The first part environment variable name. * (char *) name_after_underline - The second part environment variable name. * (char *) value . . The value to which the env variable is set. * * $Return: (void) * * $Errors: Silently returns if the env runs out of space to hold the new item * ****************************************************************************/ static void addEnv(const char *name_before_underline, const char *name_after_underline, const char *value) { char *s = NULL; const char *underline; if (!value) value = ""; underline = *name_after_underline ? "_" : ""; asprintf(&s, "%s%s%s=%s", name_before_underline, underline, name_after_underline, value); if(s) { putenv(s); } } #if defined(CONFIG_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV) || !defined(CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY) /* set environs SERVER_PORT and REMOTE_PORT */ static void addEnvPort(const char *port_name) { char buf[16]; sprintf(buf, "%u", config->port); addEnv(port_name, "PORT", buf); } #endif #endif /* CONFIG_FEATURE_HTTPD_CGI */ #ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH /**************************************************************************** * > $Function: decodeBase64() * > $Description: Decode a base 64 data stream as per rfc1521. * Note that the rfc states that none base64 chars are to be ignored. * Since the decode always results in a shorter size than the input, it is * OK to pass the input arg as an output arg. * * $Parameter: * (char *) Data . . . . A pointer to a base64 encoded string. * Where to place the decoded data. * * $Return: void * * $Errors: None * ****************************************************************************/ static void decodeBase64(char *Data) { const unsigned char *in = (const unsigned char *)Data; // The decoded size will be at most 3/4 the size of the encoded unsigned long ch = 0; int i = 0; while (*in) { int t = *in++; if(t >= '0' && t <= '9') t = t - '0' + 52; else if(t >= 'A' && t <= 'Z') t = t - 'A'; else if(t >= 'a' && t <= 'z') t = t - 'a' + 26; else if(t == '+') t = 62; else if(t == '/') t = 63; else if(t == '=') t = 0; else continue; ch = (ch << 6) | t; i++; if (i == 4) { *Data++ = (char) (ch >> 16); *Data++ = (char) (ch >> 8); *Data++ = (char) ch; i = 0; } } *Data = 0; } #endif #ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY /**************************************************************************** * > $Function: openServer() * * $Description: create a listen server socket on the designated port. * * $Return: (int) . . . A connection socket. -1 for errors. * * $Errors: None * ****************************************************************************/ static int openServer(void) { struct sockaddr_in lsocket; int fd; /* create the socket right now */ /* inet_addr() returns a value that is already in network order */ memset(&lsocket, 0, sizeof(lsocket)); lsocket.sin_family = AF_INET; lsocket.sin_addr.s_addr = INADDR_ANY; lsocket.sin_port = htons(config->port); fd = bb_xsocket(AF_INET, SOCK_STREAM, 0); /* tell the OS it's OK to reuse a previous address even though */ /* it may still be in a close down state. Allows bind to succeed. */ int on = 1; #ifdef SO_REUSEPORT setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, (void *)&on, sizeof(on)) ; #else setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (void *)&on, sizeof(on)) ; #endif bb_xbind(fd, (struct sockaddr *)&lsocket, sizeof(lsocket)); listen(fd, 9); /* bb_xlisten? */ signal(SIGCHLD, SIG_IGN); /* prevent zombie (defunct) processes */ return fd; } #endif /* CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY */ /**************************************************************************** * > $Function: sendHeaders() * * $Description: Create and send HTTP response headers. * The arguments are combined and sent as one write operation. Note that * IE will puke big-time if the headers are not sent in one packet and the * second packet is delayed for any reason. * * $Parameter: * (HttpResponseNum) responseNum . . . The result code to send. * * $Return: (int) . . . . writing errors * ****************************************************************************/ static int sendHeaders(HttpResponseNum responseNum) { char *buf = config->buf; const char *responseString = ""; const char *infoString = 0; const char *mime_type; unsigned int i; time_t timer = time(0); char timeStr[80]; int len; for (i = 0; i < (sizeof(httpResponseNames)/sizeof(httpResponseNames[0])); i++) { if (httpResponseNames[i].type == responseNum) { responseString = httpResponseNames[i].name; infoString = httpResponseNames[i].info; break; } } /* error message is HTML */ mime_type = responseNum == HTTP_OK ? config->httpd_found.found_mime_type : "text/html"; /* emit the current date */ strftime(timeStr, sizeof(timeStr), RFC1123FMT, gmtime(&timer)); len = sprintf(buf, "HTTP/1.0 %d %s\r\nContent-type: %s\r\n" "Date: %s\r\nConnection: close\r\n", responseNum, responseString, mime_type, timeStr); #ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH if (responseNum == HTTP_UNAUTHORIZED) { len += sprintf(buf+len, "WWW-Authenticate: Basic realm=\"%s\"\r\n", config->realm); } #endif if(responseNum == HTTP_MOVED_TEMPORARILY) { len += sprintf(buf+len, "Location: %s/%s%s\r\n", config->httpd_found.found_moved_temporarily, (config->query ? "?" : ""), (config->query ? config->query : "")); } if (config->ContentLength != -1) { /* file */ strftime(timeStr, sizeof(timeStr), RFC1123FMT, gmtime(&config->last_mod)); len += sprintf(buf+len, "Last-Modified: %s\r\n%s " cont_l_fmt "\r\n", timeStr, Content_length, cont_l_type config->ContentLength); } strcat(buf, "\r\n"); len += 2; if (infoString) { len += sprintf(buf+len, "%d %s\n" "

%d %s

\n%s\n\n", responseNum, responseString, responseNum, responseString, infoString); } #if DEBUG fprintf(stderr, "Headers: '%s'", buf); #endif return bb_full_write(a_c_w, buf, len); } /**************************************************************************** * > $Function: getLine() * * $Description: Read from the socket until an end of line char found. * * Characters are read one at a time until an eol sequence is found. * * $Return: (int) . . . . number of characters read. -1 if error. * ****************************************************************************/ static int getLine(void) { int count = 0; char *buf = config->buf; while (read(a_c_r, buf + count, 1) == 1) { if (buf[count] == '\r') continue; if (buf[count] == '\n') { buf[count] = 0; return count; } if(count < (MAX_MEMORY_BUFF-1)) /* check owerflow */ count++; } if (count) return count; else return -1; } #ifdef CONFIG_FEATURE_HTTPD_CGI /**************************************************************************** * > $Function: sendCgi() * * $Description: Execute a CGI script and send it's stdout back * * Environment variables are set up and the script is invoked with pipes * for stdin/stdout. If a post is being done the script is fed the POST * data in addition to setting the QUERY_STRING variable (for GETs or POSTs). * * $Parameters: * (const char *) url . . . . . . The requested URL (with leading /). * (int bodyLen) . . . . . . . . Length of the post body. * (const char *cookie) . . . . . For set HTTP_COOKIE. * (const char *content_type) . . For set CONTENT_TYPE. * * $Return: (char *) . . . . A pointer to the decoded string (same as input). * * $Errors: None * ****************************************************************************/ static int sendCgi(const char *url, const char *request, int bodyLen, const char *cookie, const char *content_type) { int fromCgi[2]; /* pipe for reading data from CGI */ int toCgi[2]; /* pipe for sending data to CGI */ static char * argp[] = { 0, 0 }; int pid = 0; int inFd; int outFd; int firstLine = 1; do { if (pipe(fromCgi) != 0) { break; } if (pipe(toCgi) != 0) { break; } pid = fork(); if (pid < 0) { pid = 0; break; } if (!pid) { /* child process */ char *script; char *purl = strdup( url ); char realpath_buff[MAXPATHLEN]; if(purl == NULL) _exit(242); inFd = toCgi[0]; outFd = fromCgi[1]; dup2(inFd, 0); // replace stdin with the pipe dup2(outFd, 1); // replace stdout with the pipe if(!DEBUG) dup2(outFd, 2); // replace stderr with the pipe close(toCgi[0]); close(toCgi[1]); close(fromCgi[0]); close(fromCgi[1]); /* * Find PATH_INFO. */ script = purl; while((script = strchr( script + 1, '/' )) != NULL) { /* have script.cgi/PATH_INFO or dirs/script.cgi[/PATH_INFO] */ struct stat sb; *script = '\0'; if(is_directory(purl + 1, 1, &sb) == 0) { /* not directory, found script.cgi/PATH_INFO */ *script = '/'; break; } *script = '/'; /* is directory, find next '/' */ } addEnv("PATH", "INFO", script); /* set /PATH_INFO or NULL */ addEnv("PATH", "", getenv("PATH")); addEnv("REQUEST", "METHOD", request); if(config->query) { char *uri = alloca(strlen(purl) + 2 + strlen(config->query)); if(uri) sprintf(uri, "%s?%s", purl, config->query); addEnv("REQUEST", "URI", uri); } else { addEnv("REQUEST", "URI", purl); } if(script != NULL) *script = '\0'; /* reduce /PATH_INFO */ /* SCRIPT_FILENAME required by PHP in CGI mode */ if(realpath(purl + 1, realpath_buff)) addEnv("SCRIPT", "FILENAME", realpath_buff); else *realpath_buff = 0; /* set SCRIPT_NAME as full path: /cgi-bin/dirs/script.cgi */ addEnv("SCRIPT_NAME", "", purl); addEnv("QUERY_STRING", "", config->query); addEnv("SERVER", "SOFTWARE", httpdVersion); addEnv("SERVER", "PROTOCOL", "HTTP/1.0"); addEnv("GATEWAY_INTERFACE", "", "CGI/1.1"); addEnv("REMOTE", "ADDR", config->rmt_ip_str); #ifdef CONFIG_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV addEnvPort("REMOTE"); #endif if(bodyLen) { char sbl[32]; sprintf(sbl, "%d", bodyLen); addEnv("CONTENT", "LENGTH", sbl); } if(cookie) addEnv("HTTP", "COOKIE", cookie); if(content_type) addEnv("CONTENT", "TYPE", content_type); #ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH if(config->remoteuser) { addEnv("REMOTE", "USER", config->remoteuser); addEnv("AUTH_TYPE", "", "Basic"); } #endif if(config->referer) addEnv("HTTP", "REFERER", config->referer); /* set execve argp[0] without path */ argp[0] = strrchr( purl, '/' ) + 1; /* but script argp[0] must have absolute path and chdiring to this */ if(*realpath_buff) { script = strrchr(realpath_buff, '/'); if(script) { *script = '\0'; if(chdir(realpath_buff) == 0) { // now run the program. If it fails, // use _exit() so no destructors // get called and make a mess. #ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR char *interpr = NULL; char *suffix = strrchr(purl, '.'); if(suffix) { Htaccess * cur; for (cur = config->script_i; cur; cur = cur->next) if(strcmp(cur->before_colon + 1, suffix) == 0) { interpr = cur->after_colon; break; } } #endif *script = '/'; #ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR if (interpr) execv(interpr, argp); else #endif execv(realpath_buff, argp); } } } #ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY config->accepted_socket = 1; /* send to stdout */ #endif sendHeaders(HTTP_NOT_FOUND); _exit(242); } /* end child */ } while (0); if (pid) { /* parent process */ int status; size_t post_readed_size = 0, post_readed_idx = 0; inFd = fromCgi[0]; outFd = toCgi[1]; close(fromCgi[1]); close(toCgi[0]); signal(SIGPIPE, SIG_IGN); while (1) { fd_set readSet; fd_set writeSet; char wbuf[128]; int nfound; int count; FD_ZERO(&readSet); FD_ZERO(&writeSet); FD_SET(inFd, &readSet); if(bodyLen > 0 || post_readed_size > 0) { FD_SET(outFd, &writeSet); nfound = outFd > inFd ? outFd : inFd; if(post_readed_size == 0) { FD_SET(a_c_r, &readSet); if(nfound < a_c_r) nfound = a_c_r; } /* Now wait on the set of sockets! */ nfound = select(nfound + 1, &readSet, &writeSet, 0, NULL); } else { if(!bodyLen) { close(outFd); bodyLen = -1; } nfound = select(inFd + 1, &readSet, 0, 0, NULL); } if (nfound <= 0) { if (waitpid(pid, &status, WNOHANG) > 0) { close(inFd); #if DEBUG if (WIFEXITED(status)) bb_error_msg("piped has exited with status=%d", WEXITSTATUS(status)); if (WIFSIGNALED(status)) bb_error_msg("piped has exited with signal=%d", WTERMSIG(status)); #endif break; } } else if(post_readed_size > 0 && FD_ISSET(outFd, &writeSet)) { count = bb_full_write(outFd, wbuf + post_readed_idx, post_readed_size); if(count > 0) { post_readed_size -= count; post_readed_idx += count; if(post_readed_size == 0) post_readed_idx = 0; } else { post_readed_size = post_readed_idx = bodyLen = 0; /* broken pipe to CGI */ } } else if(bodyLen > 0 && post_readed_size == 0 && FD_ISSET(a_c_r, &readSet)) { count = bodyLen > (int)sizeof(wbuf) ? (int)sizeof(wbuf) : bodyLen; count = safe_read(a_c_r, wbuf, count); if(count > 0) { post_readed_size += count; bodyLen -= count; } else { bodyLen = 0; /* closed */ } } if(FD_ISSET(inFd, &readSet)) { int s = a_c_w; char *rbuf = config->buf; #ifndef PIPE_BUF # define PIPESIZE 4096 /* amount of buffering in a pipe */ #else # define PIPESIZE PIPE_BUF #endif #if PIPESIZE >= MAX_MEMORY_BUFF # error "PIPESIZE >= MAX_MEMORY_BUFF" #endif // There is something to read count = safe_read(inFd, rbuf, PIPESIZE); if (count == 0) break; /* closed */ if (count > 0) { if (firstLine) { rbuf[count] = 0; /* check to see if the user script added headers */ if(strncmp(rbuf, "HTTP/1.0 200 OK\r\n", 4) != 0) { bb_full_write(s, "HTTP/1.0 200 OK\r\n", 17); } if (strstr(rbuf, "ontent-") == 0) { bb_full_write(s, "Content-type: text/plain\r\n\r\n", 28); } firstLine = 0; } if (bb_full_write(s, rbuf, count) != count) break; #if DEBUG fprintf(stderr, "cgi read %d bytes\n", count); #endif } } } } return 0; } #endif /* CONFIG_FEATURE_HTTPD_CGI */ /**************************************************************************** * > $Function: sendFile() * * $Description: Send a file response to an HTTP request * * $Parameter: * (const char *) url . . The URL requested. * * $Return: (int) . . . . . . Always 0. * ****************************************************************************/ static int sendFile(const char *url) { char * suffix; int f; const char * const * table; const char * try_suffix; suffix = strrchr(url, '.'); for (table = suffixTable; *table; table += 2) if(suffix != NULL && (try_suffix = strstr(*table, suffix)) != 0) { try_suffix += strlen(suffix); if(*try_suffix == 0 || *try_suffix == '.') break; } /* also, if not found, set default as "application/octet-stream"; */ config->httpd_found.found_mime_type = *(table+1); #ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES if (suffix) { Htaccess * cur; for (cur = config->mime_a; cur; cur = cur->next) { if(strcmp(cur->before_colon, suffix) == 0) { config->httpd_found.found_mime_type = cur->after_colon; break; } } } #endif /* CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES */ #if DEBUG fprintf(stderr, "Sending file '%s' Content-type: %s\n", url, config->httpd_found.found_mime_type); #endif f = open(url, O_RDONLY); if (f >= 0) { int count; char *buf = config->buf; sendHeaders(HTTP_OK); while ((count = bb_full_read(f, buf, MAX_MEMORY_BUFF)) > 0) { if (bb_full_write(a_c_w, buf, count) != count) break; } close(f); } else { #if DEBUG bb_perror_msg("Unable to open '%s'", url); #endif sendHeaders(HTTP_NOT_FOUND); } return 0; } static int checkPermIP(void) { Htaccess_IP * cur; /* This could stand some work */ for (cur = config->ip_a_d; cur; cur = cur->next) { #if DEBUG fprintf(stderr, "checkPermIP: '%s' ? ", config->rmt_ip_str); fprintf(stderr, "'%u.%u.%u.%u/%u.%u.%u.%u'\n", (unsigned char)(cur->ip >> 24), (unsigned char)(cur->ip >> 16), (unsigned char)(cur->ip >> 8), cur->ip & 0xff, (unsigned char)(cur->mask >> 24), (unsigned char)(cur->mask >> 16), (unsigned char)(cur->mask >> 8), cur->mask & 0xff); #endif if((config->rmt_ip & cur->mask) == cur->ip) return cur->allow_deny == 'A'; /* Allow/Deny */ } /* if unconfigured, return 1 - access from all */ return !config->flg_deny_all; } /**************************************************************************** * > $Function: checkPerm() * * $Description: Check the permission file for access password protected. * * If config file isn't present, everything is allowed. * Entries are of the form you can see example from header source * * $Parameters: * (const char *) path . . . . The file path. * (const char *) request . . . User information to validate. * * $Return: (int) . . . . . . . . . 1 if request OK, 0 otherwise. * ****************************************************************************/ #ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH static int checkPerm(const char *path, const char *request) { Htaccess * cur; const char *p; const char *p0; const char *prev = NULL; /* This could stand some work */ for (cur = config->auth; cur; cur = cur->next) { p0 = cur->before_colon; if(prev != NULL && strcmp(prev, p0) != 0) continue; /* find next identical */ p = cur->after_colon; #if DEBUG fprintf(stderr,"checkPerm: '%s' ? '%s'\n", p0, request); #endif { size_t l = strlen(p0); if(strncmp(p0, path, l) == 0 && (l == 1 || path[l] == '/' || path[l] == 0)) { char *u; /* path match found. Check request */ /* for check next /path:user:password */ prev = p0; u = strchr(request, ':'); if(u == NULL) { /* bad request, ':' required */ break; } #ifdef CONFIG_FEATURE_HTTPD_AUTH_MD5 { char *cipher; char *pp; if(strncmp(p, request, u-request) != 0) { /* user uncompared */ continue; } pp = strchr(p, ':'); if(pp && pp[1] == '$' && pp[2] == '1' && pp[3] == '$' && pp[4]) { pp++; cipher = pw_encrypt(u+1, pp); if (strcmp(cipher, pp) == 0) goto set_remoteuser_var; /* Ok */ /* unauthorized */ continue; } } #endif if (strcmp(p, request) == 0) { #ifdef CONFIG_FEATURE_HTTPD_AUTH_MD5 set_remoteuser_var: #endif config->remoteuser = strdup(request); if(config->remoteuser) config->remoteuser[(u - request)] = 0; return 1; /* Ok */ } /* unauthorized */ } } } /* for */ return prev == NULL; } #endif /* CONFIG_FEATURE_HTTPD_BASIC_AUTH */ /**************************************************************************** * > $Function: handle_sigalrm() * * $Description: Handle timeouts * ****************************************************************************/ static void handle_sigalrm( int sig ) { sendHeaders(HTTP_REQUEST_TIMEOUT); config->alarm_signaled = sig; } /**************************************************************************** * > $Function: handleIncoming() * * $Description: Handle an incoming http request. * ****************************************************************************/ static void handleIncoming(void) { char *buf = config->buf; char *url; char *purl; int blank = -1; char *test; struct stat sb; int ip_allowed; #ifdef CONFIG_FEATURE_HTTPD_CGI const char *prequest = request_GET; long length=0; char *cookie = 0; char *content_type = 0; #endif fd_set s_fd; struct timeval tv; int retval; struct sigaction sa; #ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH int credentials = -1; /* if not requred this is Ok */ #endif sa.sa_handler = handle_sigalrm; sigemptyset(&sa.sa_mask); sa.sa_flags = 0; /* no SA_RESTART */ sigaction(SIGALRM, &sa, NULL); do { int count; (void) alarm( TIMEOUT ); if (getLine() <= 0) break; /* closed */ purl = strpbrk(buf, " \t"); if(purl == NULL) { BAD_REQUEST: sendHeaders(HTTP_BAD_REQUEST); break; } *purl = 0; #ifdef CONFIG_FEATURE_HTTPD_CGI if(strcasecmp(buf, prequest) != 0) { prequest = "POST"; if(strcasecmp(buf, prequest) != 0) { sendHeaders(HTTP_NOT_IMPLEMENTED); break; } } #else if(strcasecmp(buf, request_GET) != 0) { sendHeaders(HTTP_NOT_IMPLEMENTED); break; } #endif *purl = ' '; count = sscanf(purl, " %[^ ] HTTP/%d.%*d", buf, &blank); if (count < 1 || buf[0] != '/') { /* Garbled request/URL */ goto BAD_REQUEST; } url = alloca(strlen(buf) + 12); /* + sizeof("/index.html\0") */ if(url == NULL) { sendHeaders(HTTP_INTERNAL_SERVER_ERROR); break; } strcpy(url, buf); /* extract url args if present */ test = strchr(url, '?'); if (test) { *test++ = 0; config->query = test; } test = decodeString(url, 0); if(test == NULL) goto BAD_REQUEST; if(test == (buf+1)) { sendHeaders(HTTP_NOT_FOUND); break; } /* algorithm stolen from libbb bb_simplify_path(), but don`t strdup and reducing trailing slash and protect out root */ purl = test = url; do { if (*purl == '/') { if (*test == '/') { /* skip duplicate (or initial) slash */ continue; } else if (*test == '.') { if (test[1] == '/' || test[1] == 0) { /* skip extra '.' */ continue; } else if ((test[1] == '.') && (test[2] == '/' || test[2] == 0)) { ++test; if (purl == url) { /* protect out root */ goto BAD_REQUEST; } while (*--purl != '/'); /* omit previous dir */ continue; } } } *++purl = *test; } while (*++test); *++purl = 0; /* so keep last character */ test = purl; /* end ptr */ /* If URL is directory, adding '/' */ if(test[-1] != '/') { if ( is_directory(url + 1, 1, &sb) ) { config->httpd_found.found_moved_temporarily = url; } } #if DEBUG fprintf(stderr, "url='%s', args=%s\n", url, config->query); #endif test = url; ip_allowed = checkPermIP(); while(ip_allowed && (test = strchr( test + 1, '/' )) != NULL) { /* have path1/path2 */ *test = '\0'; if( is_directory(url + 1, 1, &sb) ) { /* may be having subdir config */ parse_conf(url + 1, SUBDIR_PARSE); ip_allowed = checkPermIP(); } *test = '/'; } if(blank >= 0) { // read until blank line for HTTP version specified, else parse immediate while(1) { alarm(TIMEOUT); count = getLine(); if(count <= 0) break; #if DEBUG fprintf(stderr, "Header: '%s'\n", buf); #endif #ifdef CONFIG_FEATURE_HTTPD_CGI /* try and do our best to parse more lines */ if ((strncasecmp(buf, Content_length, 15) == 0)) { if(prequest != request_GET) length = strtol(buf + 15, 0, 0); // extra read only for POST } else if ((strncasecmp(buf, "Cookie:", 7) == 0)) { for(test = buf + 7; isspace(*test); test++) ; cookie = strdup(test); } else if ((strncasecmp(buf, "Content-Type:", 13) == 0)) { for(test = buf + 13; isspace(*test); test++) ; content_type = strdup(test); } else if ((strncasecmp(buf, "Referer:", 8) == 0)) { for(test = buf + 8; isspace(*test); test++) ; config->referer = strdup(test); } #endif #ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH if (strncasecmp(buf, "Authorization:", 14) == 0) { /* We only allow Basic credentials. * It shows up as "Authorization: Basic " where * the userid:password is base64 encoded. */ for(test = buf + 14; isspace(*test); test++) ; if (strncasecmp(test, "Basic", 5) != 0) continue; test += 5; /* decodeBase64() skiping space self */ decodeBase64(test); credentials = checkPerm(url, test); } #endif /* CONFIG_FEATURE_HTTPD_BASIC_AUTH */ } /* while extra header reading */ } (void) alarm( 0 ); if(config->alarm_signaled) break; if (strcmp(strrchr(url, '/') + 1, httpd_conf) == 0 || ip_allowed == 0) { /* protect listing [/path]/httpd_conf or IP deny */ #ifdef CONFIG_FEATURE_HTTPD_CGI FORBIDDEN: /* protect listing /cgi-bin */ #endif sendHeaders(HTTP_FORBIDDEN); break; } #ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH if (credentials <= 0 && checkPerm(url, ":") == 0) { sendHeaders(HTTP_UNAUTHORIZED); break; } #endif if(config->httpd_found.found_moved_temporarily) { sendHeaders(HTTP_MOVED_TEMPORARILY); #if DEBUG /* clear unforked memory flag */ config->httpd_found.found_moved_temporarily = NULL; #endif break; } test = url + 1; /* skip first '/' */ #ifdef CONFIG_FEATURE_HTTPD_CGI /* if strange Content-Length */ if (length < 0) break; if (strncmp(test, "cgi-bin", 7) == 0) { if(test[7] == '/' && test[8] == 0) goto FORBIDDEN; // protect listing cgi-bin/ sendCgi(url, prequest, length, cookie, content_type); } else { if (prequest != request_GET) sendHeaders(HTTP_NOT_IMPLEMENTED); else { #endif /* CONFIG_FEATURE_HTTPD_CGI */ if(purl[-1] == '/') strcpy(purl, "index.html"); if ( stat(test, &sb ) == 0 ) { config->ContentLength = sb.st_size; config->last_mod = sb.st_mtime; } sendFile(test); #ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY /* unset if non inetd looped */ config->ContentLength = -1; #endif #ifdef CONFIG_FEATURE_HTTPD_CGI } } #endif } while (0); #ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY /* from inetd don`t looping: freeing, closing automatic from exit always */ # if DEBUG fprintf(stderr, "closing socket\n"); # endif # ifdef CONFIG_FEATURE_HTTPD_CGI free(cookie); free(content_type); free(config->referer); #ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH free(config->remoteuser); #endif # endif #endif /* CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY */ shutdown(a_c_w, SHUT_WR); /* Properly wait for remote to closed */ FD_ZERO (&s_fd) ; FD_SET (a_c_r, &s_fd) ; do { tv.tv_sec = 2 ; tv.tv_usec = 0 ; retval = select (a_c_r + 1, &s_fd, NULL, NULL, &tv); } while (retval > 0 && (read (a_c_r, buf, sizeof (config->buf)) > 0)); shutdown(a_c_r, SHUT_RD); #ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY close(config->accepted_socket); #endif /* CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY */ } /**************************************************************************** * > $Function: miniHttpd() * * $Description: The main http server function. * * Given an open socket fildes, listen for new connections and farm out * the processing as a forked process. * * $Parameters: * (int) server. . . The server socket fildes. * * $Return: (int) . . . . Always 0. * ****************************************************************************/ #ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY static int miniHttpd(int server) { fd_set readfd, portfd; FD_ZERO(&portfd); FD_SET(server, &portfd); /* copy the ports we are watching to the readfd set */ while (1) { readfd = portfd; /* Now wait INDEFINITELY on the set of sockets! */ if (select(server + 1, &readfd, 0, 0, 0) > 0) { if (FD_ISSET(server, &readfd)) { int on; struct sockaddr_in fromAddr; socklen_t fromAddrLen = sizeof(fromAddr); int s = accept(server, (struct sockaddr *)&fromAddr, &fromAddrLen); if (s < 0) { continue; } config->accepted_socket = s; config->rmt_ip = ntohl(fromAddr.sin_addr.s_addr); #if ENABLE_FEATURE_HTTPD_CGI || DEBUG sprintf(config->rmt_ip_str, "%u.%u.%u.%u", (unsigned char)(config->rmt_ip >> 24), (unsigned char)(config->rmt_ip >> 16), (unsigned char)(config->rmt_ip >> 8), config->rmt_ip & 0xff); config->port = ntohs(fromAddr.sin_port); #if DEBUG bb_error_msg("connection from IP=%s, port %u\n", config->rmt_ip_str, config->port); #endif #endif /* CONFIG_FEATURE_HTTPD_CGI */ /* set the KEEPALIVE option to cull dead connections */ on = 1; setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, (void *)&on, sizeof (on)); #if !DEBUG if (fork() == 0) #endif { /* This is the spawned thread */ #ifdef CONFIG_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP /* protect reload config, may be confuse checking */ signal(SIGHUP, SIG_IGN); #endif handleIncoming(); #if !DEBUG exit(0); #endif } close(s); } } } // while (1) return 0; } #else /* from inetd */ static int miniHttpd(void) { struct sockaddr_in fromAddrLen; socklen_t sinlen = sizeof (struct sockaddr_in); getpeername (0, (struct sockaddr *)&fromAddrLen, &sinlen); config->rmt_ip = ntohl(fromAddrLen.sin_addr.s_addr); #if ENABLE_FEATURE_HTTPD_CGI sprintf(config->rmt_ip_str, "%u.%u.%u.%u", (unsigned char)(config->rmt_ip >> 24), (unsigned char)(config->rmt_ip >> 16), (unsigned char)(config->rmt_ip >> 8), config->rmt_ip & 0xff); #endif config->port = ntohs(fromAddrLen.sin_port); handleIncoming(); return 0; } #endif /* CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY */ #ifdef CONFIG_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP static void sighup_handler(int sig) { /* set and reset */ struct sigaction sa; parse_conf(default_path_httpd_conf, sig == SIGHUP ? SIGNALED_PARSE : FIRST_PARSE); sa.sa_handler = sighup_handler; sigemptyset(&sa.sa_mask); sa.sa_flags = SA_RESTART; sigaction(SIGHUP, &sa, NULL); } #endif enum httpd_opts_nums { c_opt_config_file = 0, d_opt_decode_url, h_opt_home_httpd, USE_FEATURE_HTTPD_ENCODE_URL_STR(e_opt_encode_url,) USE_FEATURE_HTTPD_BASIC_AUTH(r_opt_realm,) USE_FEATURE_HTTPD_AUTH_MD5(m_opt_md5,) USE_FEATURE_HTTPD_SETUID(u_opt_setuid,) SKIP_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY(p_opt_port,) }; static const char httpd_opts[]="c:d:h:" USE_FEATURE_HTTPD_ENCODE_URL_STR("e:") USE_FEATURE_HTTPD_BASIC_AUTH("r:") USE_FEATURE_HTTPD_AUTH_MD5("m:") USE_FEATURE_HTTPD_SETUID("u:") SKIP_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY("p:"); #define OPT_CONFIG_FILE (1<realm = "Web Server Authentication"; #endif #ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY config->port = 80; #endif config->ContentLength = -1; opt = bb_getopt_ulflags(argc, argv, httpd_opts, &(config->configFile), &url_for_decode, &home_httpd USE_FEATURE_HTTPD_ENCODE_URL_STR(, &url_for_encode) USE_FEATURE_HTTPD_BASIC_AUTH(, &(config->realm)) USE_FEATURE_HTTPD_AUTH_MD5(, &pass) USE_FEATURE_HTTPD_SETUID(, &s_uid) SKIP_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY(, &s_port) ); if(opt & OPT_DECODE_URL) { printf("%s", decodeString(url_for_decode, 1)); return 0; } #ifdef CONFIG_FEATURE_HTTPD_ENCODE_URL_STR if(opt & OPT_ENCODE_URL) { printf("%s", encodeString(url_for_encode)); return 0; } #endif #ifdef CONFIG_FEATURE_HTTPD_AUTH_MD5 if(opt & OPT_MD5) { printf("%s\n", pw_encrypt(pass, "$1$")); return 0; } #endif #ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY if(opt & OPT_PORT) config->port = bb_xgetlarg(s_port, 10, 1, 0xffff); #ifdef CONFIG_FEATURE_HTTPD_SETUID if(opt & OPT_SETUID) { char *e; uid = strtol(s_uid, &e, 0); if(*e != '\0') { /* not integer */ uid = bb_xgetpwnam(s_uid); } } #endif #endif bb_xchdir(home_httpd); #ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY server = openServer(); # ifdef CONFIG_FEATURE_HTTPD_SETUID /* drop privileges */ if(uid > 0) setuid(uid); # endif #endif #ifdef CONFIG_FEATURE_HTTPD_CGI { char *p = getenv("PATH"); if(p) { p = bb_xstrdup(p); } clearenv(); if(p) setenv("PATH", p, 1); # ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY addEnvPort("SERVER"); # endif } #endif #ifdef CONFIG_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP sighup_handler(0); #else parse_conf(default_path_httpd_conf, FIRST_PARSE); #endif #if !ENABLE_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY # if !DEBUG bb_xdaemon(1, 0); /* don`t change curent directory */ # endif return miniHttpd(server); #else return miniHttpd(); #endif }