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Diffstat (limited to 'busybox/networking/httpd.c')
| -rw-r--r-- | busybox/networking/httpd.c | 2091 |
1 files changed, 2091 insertions, 0 deletions
diff --git a/busybox/networking/httpd.c b/busybox/networking/httpd.c new file mode 100644 index 0000000..83ded53 --- /dev/null +++ b/busybox/networking/httpd.c @@ -0,0 +1,2091 @@ +/* + * httpd implementation for busybox + * + * Copyright (C) 2002,2003 Glenn Engel <glenne@engel.org> + * Copyright (C) 2003,2004 Vladimir Oleynik <dzo@simtreas.ru> + * + * simplify patch stolen from libbb without using strdup + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + ***************************************************************************** + * + * 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 "<Hello World>"` # 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 + * + * 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 <stdio.h> +#include <ctype.h> /* for isspace */ +#include <string.h> +#include <stdlib.h> /* for malloc */ +#include <time.h> +#include <unistd.h> /* for close */ +#include <signal.h> +#include <sys/types.h> +#include <sys/socket.h> /* for connect and socket*/ +#include <netinet/in.h> /* for sockaddr_in */ +#include <sys/time.h> +#include <sys/stat.h> +#include <sys/wait.h> +#include <fcntl.h> /* 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" +#else +# define cont_l_fmt "%ld" +#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 +/* 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 + +/* require from libbb.a for linking */ +const char *bb_applet_name = "httpd"; + +void bb_show_usage(void) +{ + fprintf(stderr, "Usage: %s [-p <port>] [-c configFile] [-d/-e <string>] " + "[-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 + +#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]; + +#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH + const char *realm; + char *remoteuser; +#endif + + const char *query; + +#ifdef CONFIG_FEATURE_HTTPD_CGI + char *referer; +#endif + + const char *configFile; + + unsigned int rmt_ip; +#if defined(CONFIG_FEATURE_HTTPD_CGI) || defined(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 + int debugHttpd; /* if seted, don`t stay daemon */ +#else +#define a_c_r 0 +#define a_c_w 1 +#endif + volatile int alarm_signaled; + +} 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" }, + { 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) + /* 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 + } +#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 + ) + 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) + /* 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_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; + int 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*5 +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 value; + sscanf(ptr+1, "%2X", &value); + *string++ = value; + ptr += 3; + } + } + *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 = 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 = socket(AF_INET, SOCK_STREAM, 0); + if (fd >= 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 + if (bind(fd, (struct sockaddr *)&lsocket, sizeof(lsocket)) == 0) { + listen(fd, 9); + signal(SIGCHLD, SIG_IGN); /* prevent zombie (defunct) processes */ + } else { + bb_perror_msg_and_die("bind"); + } + } else { + bb_perror_msg_and_die("create socket"); + } + 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\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, config->ContentLength); + } + strcat(buf, "\r\n"); + len += 2; + if (infoString) { + len += sprintf(buf+len, + "<HEAD><TITLE>%d %s</TITLE></HEAD>\n" + "<BODY><H1>%d %s</H1>\n%s\n</BODY>\n", + responseNum, responseString, + responseNum, responseString, infoString); + } +#ifdef DEBUG + if (config->debugHttpd) 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 + +#ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY + if (!config->debugHttpd) +#endif + 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 */ + /* 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(purl + 1, realpath_buff) != NULL) { + script = strrchr(realpath_buff, '/'); + if(script) { + *script = '\0'; + if(chdir(realpath_buff) == 0) { + *script = '/'; + // now run the program. If it fails, + // use _exit() so no destructors + // get called and make a mess. + 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); +#ifdef DEBUG + if (config->debugHttpd) { + 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 if(bodyLen > 0 && post_readed_size == 0 && FD_ISSET(a_c_r, &readSet)) { + count = bodyLen > sizeof(wbuf) ? 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\n", 4) != 0) { + bb_full_write(s, "HTTP/1.0 200 OK\n", 16); + } + if (strstr(rbuf, "ontent-") == 0) { + bb_full_write(s, "Content-type: text/plain\n\n", 26); + } + firstLine = 0; + } + if (bb_full_write(s, rbuf, count) != count) + break; + +#ifdef DEBUG + if (config->debugHttpd) + 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 */ + +#ifdef DEBUG + if (config->debugHttpd) + 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 { +#ifdef DEBUG + if (config->debugHttpd) + 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) { +#ifdef DEBUG + if (config->debugHttpd) { + 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. + * + * $Return: (int) . . . . . . . . . 1 if request OK, 0 otherwise. + * + ****************************************************************************/ + +#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH +static int checkPerm(const char *path, const char *request) +{ + Htaccess * cur; + const char *p; + const char *p0; + + const char *prev = NULL; + + /* This could stand some work */ + for (cur = config->auth; cur; cur = cur->next) { + p0 = cur->before_colon; + if(prev != NULL && strcmp(prev, p0) != 0) + continue; /* find next identical */ + p = cur->after_colon; +#ifdef DEBUG + if (config->debugHttpd) + fprintf(stderr,"checkPerm: '%s' ? '%s'\n", p0, request); +#endif + { + int l = strlen(p0); + + if(strncmp(p0, path, l) == 0 && + (l == 1 || path[l] == '/' || path[l] == 0)) { + char *u; + /* path match found. Check request */ + /* for check next /path:user:password */ + prev = p0; + u = strchr(request, ':'); + if(u == NULL) { + /* bad request, ':' required */ + break; + } + +#ifdef CONFIG_FEATURE_HTTPD_AUTH_MD5 + { + char *cipher; + char *pp; + + if(strncmp(p, request, u-request) != 0) { + /* user uncompared */ + continue; + } + pp = strchr(p, ':'); + if(pp && pp[1] == '$' && 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: handleIncoming() + * + * $Description: Handle an incoming http request. + * + ****************************************************************************/ + +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 +#ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY + fd_set s_fd; + struct timeval tv; + int retval; +#endif + 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); + + decodeString(buf, 0); + 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; + } + + /* 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 URL is directory, adding '/' */ + if(test[-1] != '/') { + if ( is_directory(url + 1, 1, &sb) ) { + config->httpd_found.found_moved_temporarily = url; + } + } +#ifdef DEBUG + if (config->debugHttpd) + 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 = '/'; + } + + // read until blank line for HTTP version specified, else parse immediate + while (blank >= 0 && alarm(TIMEOUT) >= 0 && (count = getLine()) > 0) { + +#ifdef DEBUG + if (config->debugHttpd) 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 <userid:password>" 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); +#ifdef DEBUG + /* clear unforked memory flag */ + if(config->debugHttpd) + 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 */ +# ifdef DEBUG + if (config->debugHttpd) 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 + shutdown(a_c_w, SHUT_WR); + + /* Properly wait for remote to closed */ + FD_ZERO (&s_fd) ; + FD_SET (a_c_w, &s_fd) ; + + do { + tv.tv_sec = 2 ; + tv.tv_usec = 0 ; + retval = select (a_c_w + 1, &s_fd, NULL, NULL, &tv); + } while (retval > 0 && (read (a_c_w, buf, sizeof (config->buf)) > 0)); + + shutdown(a_c_r, SHUT_RD); + 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 defined(CONFIG_FEATURE_HTTPD_CGI) || defined(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); +#ifdef DEBUG + if (config->debugHttpd) { + 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 (config->debugHttpd || fork() == 0) { + /* 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(!config->debugHttpd) + exit(0); + } + 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 defined(CONFIG_FEATURE_HTTPD_CGI) || defined(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); +#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 + + +static const char httpd_opts[]="c:d:h:" +#ifdef CONFIG_FEATURE_HTTPD_ENCODE_URL_STR + "e:" +#define OPT_INC_1 1 +#else +#define OPT_INC_1 0 +#endif +#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH + "r:" +# ifdef CONFIG_FEATURE_HTTPD_AUTH_MD5 + "m:" +# define OPT_INC_2 2 +# else +# define OPT_INC_2 1 +#endif +#else +#define OPT_INC_2 0 +#endif +#ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY + "p:v" +#ifdef CONFIG_FEATURE_HTTPD_SETUID + "u:" +#endif +#endif /* CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY */ + ; + +#define OPT_CONFIG_FILE (1<<0) +#define OPT_DECODE_URL (1<<1) +#define OPT_HOME_HTTPD (1<<2) +#define OPT_ENCODE_URL (1<<(2+OPT_INC_1)) +#define OPT_REALM (1<<(3+OPT_INC_1)) +#define OPT_MD5 (1<<(4+OPT_INC_1)) +#define OPT_PORT (1<<(3+OPT_INC_1+OPT_INC_2)) +#define OPT_DEBUG (1<<(4+OPT_INC_1+OPT_INC_2)) +#define OPT_SETUID (1<<(5+OPT_INC_1+OPT_INC_2)) + + +#ifdef HTTPD_STANDALONE +int main(int argc, char *argv[]) +#else +int httpd_main(int argc, char *argv[]) +#endif +{ + unsigned long opt; + const char *home_httpd = home; + char *url_for_decode; +#ifdef CONFIG_FEATURE_HTTPD_ENCODE_URL_STR + const char *url_for_encode; +#endif +#ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY + const char *s_port; +#endif + +#ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY + int server; +#endif + +#ifdef CONFIG_FEATURE_HTTPD_SETUID + const char *s_uid; + long uid = -1; +#endif + +#ifdef CONFIG_FEATURE_HTTPD_AUTH_MD5 + const char *pass; +#endif + + config = xcalloc(1, sizeof(*config)); +#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH + config->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 +#ifdef CONFIG_FEATURE_HTTPD_ENCODE_URL_STR + , &url_for_encode +#endif +#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH + , &(config->realm) +# ifdef CONFIG_FEATURE_HTTPD_AUTH_MD5 + , &pass +# endif +#endif +#ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY + , &s_port +#ifdef CONFIG_FEATURE_HTTPD_SETUID + , &s_uid +#endif +#endif + ); + + 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); + config->debugHttpd = opt & OPT_DEBUG; +#ifdef CONFIG_FEATURE_HTTPD_SETUID + if(opt & OPT_SETUID) { + char *e; + + uid = strtol(s_uid, &e, 0); + if(*e != '\0') { + /* not integer */ + uid = my_getpwnam(s_uid); + } + } +#endif +#endif + + if(chdir(home_httpd)) { + bb_perror_msg_and_die("can`t chdir to %s", 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 + +#ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY + if (!config->debugHttpd) { + if (daemon(1, 0) < 0) /* don`t change curent directory */ + bb_perror_msg_and_die("daemon"); + } + return miniHttpd(server); +#else + return miniHttpd(); +#endif +} |