From 4ebe5e79c6d2c55877f9abf04e63ca9a9b1b7bd6 Mon Sep 17 00:00:00 2001 From: Jo-Philipp Wich Date: Thu, 25 Mar 2010 15:46:16 +0000 Subject: [package] add uhttpd (moved from LuCI trunk) git-svn-id: svn://svn.openwrt.org/openwrt/trunk@20428 3c298f89-4303-0410-b956-a3cf2f4a3e73 --- package/uhttpd/src/uhttpd.c | 899 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 899 insertions(+) create mode 100644 package/uhttpd/src/uhttpd.c (limited to 'package/uhttpd/src/uhttpd.c') diff --git a/package/uhttpd/src/uhttpd.c b/package/uhttpd/src/uhttpd.c new file mode 100644 index 0000000000..a7db794a5b --- /dev/null +++ b/package/uhttpd/src/uhttpd.c @@ -0,0 +1,899 @@ +/* + * uhttpd - Tiny single-threaded httpd - Main component + * + * Copyright (C) 2010 Jo-Philipp Wich + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#define _XOPEN_SOURCE 500 /* crypt() */ + +#include "uhttpd.h" +#include "uhttpd-utils.h" +#include "uhttpd-file.h" + +#ifdef HAVE_CGI +#include "uhttpd-cgi.h" +#endif + +#ifdef HAVE_LUA +#include "uhttpd-lua.h" +#endif + +#ifdef HAVE_TLS +#include "uhttpd-tls.h" +#endif + + +static int run = 1; + +static void uh_sigterm(int sig) +{ + run = 0; +} + +static void uh_config_parse(const char *path) +{ + FILE *c; + char line[512]; + char *user = NULL; + char *pass = NULL; + char *eol = NULL; + + if( (c = fopen(path ? path : "/etc/httpd.conf", "r")) != NULL ) + { + memset(line, 0, sizeof(line)); + + while( fgets(line, sizeof(line) - 1, c) ) + { + if( (line[0] == '/') && (strchr(line, ':') != NULL) ) + { + if( !(user = strchr(line, ':')) || (*user++ = 0) || + !(pass = strchr(user, ':')) || (*pass++ = 0) || + !(eol = strchr(pass, '\n')) || (*eol++ = 0) ) + continue; + + if( !uh_auth_add(line, user, pass) ) + { + fprintf(stderr, + "Can not manage more than %i basic auth realms, " + "will skip the rest\n", UH_LIMIT_AUTHREALMS + ); + + break; + } + } + } + + fclose(c); + } +} + +static int uh_socket_bind( + fd_set *serv_fds, int *max_fd, const char *host, const char *port, + struct addrinfo *hints, int do_tls, struct config *conf +) { + int sock = -1; + int yes = 1; + int status; + int bound = 0; + + struct listener *l = NULL; + struct addrinfo *addrs = NULL, *p = NULL; + + if( (status = getaddrinfo(host, port, hints, &addrs)) != 0 ) + { + fprintf(stderr, "getaddrinfo(): %s\n", gai_strerror(status)); + } + + /* try to bind a new socket to each found address */ + for( p = addrs; p; p = p->ai_next ) + { + /* get the socket */ + if( (sock = socket(p->ai_family, p->ai_socktype, p->ai_protocol)) == -1 ) + { + perror("socket()"); + goto error; + } + + /* "address already in use" */ + if( setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) == -1 ) + { + perror("setsockopt()"); + goto error; + } + + /* required to get parallel v4 + v6 working */ + if( p->ai_family == AF_INET6 ) + { + if( setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &yes, sizeof(yes)) == -1 ) + { + perror("setsockopt()"); + goto error; + } + } + + /* bind */ + if( bind(sock, p->ai_addr, p->ai_addrlen) == -1 ) + { + perror("bind()"); + goto error; + } + + /* listen */ + if( listen(sock, UH_LIMIT_CLIENTS) == -1 ) + { + perror("listen()"); + goto error; + } + + /* add listener to global list */ + if( ! (l = uh_listener_add(sock, conf)) ) + { + fprintf(stderr, + "uh_listener_add(): Can not create more than " + "%i listen sockets\n", UH_LIMIT_LISTENERS + ); + + goto error; + } + +#ifdef HAVE_TLS + /* init TLS */ + l->tls = do_tls ? conf->tls : NULL; +#endif + + /* add socket to server fd set */ + FD_SET(sock, serv_fds); + *max_fd = max(*max_fd, sock); + + bound++; + continue; + + error: + if( sock > 0 ) + close(sock); + } + + freeaddrinfo(addrs); + + return bound; +} + +static struct http_request * uh_http_header_parse(struct client *cl, char *buffer, int buflen) +{ + char *method = &buffer[0]; + char *path = NULL; + char *version = NULL; + + char *headers = NULL; + char *hdrname = NULL; + char *hdrdata = NULL; + + int i; + int hdrcount = 0; + + static struct http_request req; + + memset(&req, 0, sizeof(req)); + + + /* terminate initial header line */ + if( (headers = strfind(buffer, buflen, "\r\n", 2)) != NULL ) + { + buffer[buflen-1] = 0; + + *headers++ = 0; + *headers++ = 0; + + /* find request path */ + if( (path = strchr(buffer, ' ')) != NULL ) + *path++ = 0; + + /* find http version */ + if( (path != NULL) && ((version = strchr(path, ' ')) != NULL) ) + *version++ = 0; + + + /* check method */ + if( strcmp(method, "GET") && strcmp(method, "HEAD") && strcmp(method, "POST") ) + { + /* invalid method */ + uh_http_response(cl, 405, "Method Not Allowed"); + return NULL; + } + else + { + switch(method[0]) + { + case 'G': + req.method = UH_HTTP_MSG_GET; + break; + + case 'H': + req.method = UH_HTTP_MSG_HEAD; + break; + + case 'P': + req.method = UH_HTTP_MSG_POST; + break; + } + } + + /* check path */ + if( !path || !strlen(path) ) + { + /* malformed request */ + uh_http_response(cl, 400, "Bad Request"); + return NULL; + } + else + { + req.url = path; + } + + /* check version */ + if( strcmp(version, "HTTP/0.9") && strcmp(version, "HTTP/1.0") && strcmp(version, "HTTP/1.1") ) + { + /* unsupported version */ + uh_http_response(cl, 400, "Bad Request"); + return NULL; + } + else + { + req.version = strtof(&version[5], NULL); + } + + + /* process header fields */ + for( i = (int)(headers - buffer); i < buflen; i++ ) + { + /* found eol and have name + value, push out header tuple */ + if( hdrname && hdrdata && (buffer[i] == '\r' || buffer[i] == '\n') ) + { + buffer[i] = 0; + + /* store */ + if( (hdrcount + 1) < array_size(req.headers) ) + { + req.headers[hdrcount++] = hdrname; + req.headers[hdrcount++] = hdrdata; + + hdrname = hdrdata = NULL; + } + + /* too large */ + else + { + uh_http_response(cl, 413, "Request Entity Too Large"); + return NULL; + } + } + + /* have name but no value and found a colon, start of value */ + else if( hdrname && !hdrdata && ((i+2) < buflen) && + (buffer[i] == ':') && (buffer[i+1] == ' ') + ) { + buffer[i] = 0; + hdrdata = &buffer[i+2]; + } + + /* have no name and found [A-Z], start of name */ + else if( !hdrname && isalpha(buffer[i]) && isupper(buffer[i]) ) + { + hdrname = &buffer[i]; + } + } + + /* valid enough */ + return &req; + } + + /* Malformed request */ + uh_http_response(cl, 400, "Bad Request"); + return NULL; +} + + +static struct http_request * uh_http_header_recv(struct client *cl) +{ + static char buffer[UH_LIMIT_MSGHEAD]; + char *bufptr = &buffer[0]; + char *idxptr = NULL; + + struct timeval timeout; + + fd_set reader; + + ssize_t blen = sizeof(buffer)-1; + ssize_t rlen = 0; + + + memset(buffer, 0, sizeof(buffer)); + + while( blen > 0 ) + { + FD_ZERO(&reader); + FD_SET(cl->socket, &reader); + + /* fail after 0.1s */ + timeout.tv_sec = 0; + timeout.tv_usec = 100000; + + /* check whether fd is readable */ + if( select(cl->socket + 1, &reader, NULL, NULL, &timeout) > 0 ) + { + /* receive data */ + rlen = uh_tcp_peek(cl, bufptr, blen); + + if( rlen > 0 ) + { + if( (idxptr = strfind(buffer, sizeof(buffer), "\r\n\r\n", 4)) ) + { + blen -= uh_tcp_recv(cl, bufptr, (int)(idxptr - bufptr) + 4); + + /* header read complete ... */ + return uh_http_header_parse(cl, buffer, sizeof(buffer) - blen - 1); + } + else + { + rlen = uh_tcp_recv(cl, bufptr, rlen); + blen -= rlen; + bufptr += rlen; + } + } + else + { + /* invalid request (unexpected eof/timeout) */ + uh_http_response(cl, 408, "Request Timeout"); + return NULL; + } + } + else + { + /* invalid request (unexpected eof/timeout) */ + uh_http_response(cl, 408, "Request Timeout"); + return NULL; + } + } + + /* request entity too large */ + uh_http_response(cl, 413, "Request Entity Too Large"); + return NULL; +} + +static int uh_path_match(const char *prefix, const char *url) +{ + if( (strstr(url, prefix) == url) && + ((prefix[strlen(prefix)-1] == '/') || + (strlen(url) == strlen(prefix)) || + (url[strlen(prefix)] == '/')) + ) { + return 1; + } + + return 0; +} + + +int main (int argc, char **argv) +{ +#ifdef HAVE_LUA + /* Lua runtime */ + lua_State *L = NULL; +#endif + + /* master file descriptor list */ + fd_set used_fds, serv_fds, read_fds; + + /* working structs */ + struct addrinfo hints; + struct http_request *req; + struct path_info *pin; + struct client *cl; + struct sigaction sa; + struct config conf; + + /* maximum file descriptor number */ + int new_fd, cur_fd, max_fd = 0; + + int tls = 0; + int keys = 0; + int bound = 0; + int nofork = 0; + + /* args */ + char opt; + char bind[128]; + char *port = NULL; + + /* library handles */ + void *tls_lib; + void *lua_lib; + + /* clear the master and temp sets */ + FD_ZERO(&used_fds); + FD_ZERO(&serv_fds); + FD_ZERO(&read_fds); + + /* handle SIGPIPE, SIGCHILD */ + sa.sa_flags = 0; + sigemptyset(&sa.sa_mask); + + sa.sa_handler = SIG_IGN; + sigaction(SIGPIPE, &sa, NULL); + sigaction(SIGCHLD, &sa, NULL); + + sa.sa_handler = uh_sigterm; + sigaction(SIGINT, &sa, NULL); + sigaction(SIGTERM, &sa, NULL); + + /* prepare addrinfo hints */ + memset(&hints, 0, sizeof(hints)); + hints.ai_family = AF_UNSPEC; + hints.ai_socktype = SOCK_STREAM; + hints.ai_flags = AI_PASSIVE; + + /* parse args */ + memset(&conf, 0, sizeof(conf)); + memset(bind, 0, sizeof(bind)); + +#ifdef HAVE_TLS + /* load TLS plugin */ + if( ! (tls_lib = dlopen("uhttpd_tls.so", RTLD_LAZY | RTLD_GLOBAL)) ) + { + fprintf(stderr, + "Notice: Unable to load TLS plugin - disabling SSL support! " + "(Reason: %s)\n", dlerror() + ); + } + else + { + /* resolve functions */ + if( !(conf.tls_init = dlsym(tls_lib, "uh_tls_ctx_init")) || + !(conf.tls_cert = dlsym(tls_lib, "uh_tls_ctx_cert")) || + !(conf.tls_key = dlsym(tls_lib, "uh_tls_ctx_key")) || + !(conf.tls_free = dlsym(tls_lib, "uh_tls_ctx_free")) || + !(conf.tls_accept = dlsym(tls_lib, "uh_tls_client_accept")) || + !(conf.tls_close = dlsym(tls_lib, "uh_tls_client_close")) || + !(conf.tls_recv = dlsym(tls_lib, "uh_tls_client_recv")) || + !(conf.tls_send = dlsym(tls_lib, "uh_tls_client_send")) + ) { + fprintf(stderr, + "Error: Failed to lookup required symbols " + "in TLS plugin: %s\n", dlerror() + ); + exit(1); + } + + /* init SSL context */ + if( ! (conf.tls = conf.tls_init()) ) + { + fprintf(stderr, "Error: Failed to initalize SSL context\n"); + exit(1); + } + } +#endif + + while( (opt = getopt(argc, argv, "fC:K:p:s:h:c:l:L:d:r:m:x:")) > 0 ) + { + switch(opt) + { + /* [addr:]port */ + case 'p': + case 's': + if( (port = strrchr(optarg, ':')) != NULL ) + { + if( (optarg[0] == '[') && (port > optarg) && (port[-1] == ']') ) + memcpy(bind, optarg + 1, + min(sizeof(bind), (int)(port - optarg) - 2)); + else + memcpy(bind, optarg, + min(sizeof(bind), (int)(port - optarg))); + + port++; + } + else + { + port = optarg; + } + + if( opt == 's' ) + { + if( !conf.tls ) + { + fprintf(stderr, + "Notice: TLS support is disabled, " + "ignoring '-s %s'\n", optarg + ); + continue; + } + + tls = 1; + } + + /* bind sockets */ + bound += uh_socket_bind( + &serv_fds, &max_fd, bind[0] ? bind : NULL, port, + &hints, (opt == 's'), &conf + ); + + break; + +#ifdef HAVE_TLS + /* certificate */ + case 'C': + if( conf.tls ) + { + if( conf.tls_cert(conf.tls, optarg) < 1 ) + { + fprintf(stderr, + "Error: Invalid certificate file given\n"); + exit(1); + } + + keys++; + } + + break; + + /* key */ + case 'K': + if( conf.tls ) + { + if( conf.tls_key(conf.tls, optarg) < 1 ) + { + fprintf(stderr, + "Error: Invalid private key file given\n"); + exit(1); + } + + keys++; + } + + break; +#endif + + /* docroot */ + case 'h': + if( ! realpath(optarg, conf.docroot) ) + { + fprintf(stderr, "Error: Invalid directory %s: %s\n", + optarg, strerror(errno)); + exit(1); + } + break; + +#ifdef HAVE_CGI + /* cgi prefix */ + case 'x': + conf.cgi_prefix = optarg; + break; +#endif + +#ifdef HAVE_LUA + /* lua prefix */ + case 'l': + conf.lua_prefix = optarg; + break; + + /* lua handler */ + case 'L': + conf.lua_handler = optarg; + break; +#endif + + /* no fork */ + case 'f': + nofork = 1; + break; + + /* urldecode */ + case 'd': + if( (port = malloc(strlen(optarg)+1)) != NULL ) + { + memset(port, 0, strlen(optarg)+1); + uh_urldecode(port, strlen(optarg), optarg, strlen(optarg)); + printf("%s", port); + free(port); + exit(0); + } + break; + + /* basic auth realm */ + case 'r': + conf.realm = optarg; + break; + + /* md5 crypt */ + case 'm': + printf("%s\n", crypt(optarg, "$1$")); + exit(0); + break; + + /* config file */ + case 'c': + conf.file = optarg; + break; + + default: + fprintf(stderr, + "Usage: %s -p [addr:]port [-h docroot]\n" + " -f Do not fork to background\n" + " -c file Configuration file, default is '/etc/httpd.conf'\n" + " -p [addr:]port Bind to specified address and port, multiple allowed\n" +#ifdef HAVE_TLS + " -s [addr:]port Like -p but provide HTTPS on this port\n" + " -C file ASN.1 server certificate file\n" + " -K file ASN.1 server private key file\n" +#endif + " -h directory Specify the document root, default is '.'\n" +#ifdef HAVE_LUA + " -l string URL prefix for Lua handler, default is '/lua'\n" + " -L file Lua handler script, omit to disable Lua\n" +#endif +#ifdef HAVE_CGI + " -x string URL prefix for CGI handler, default is '/cgi-bin'\n" +#endif + " -d string URL decode given string\n" + " -r string Specify basic auth realm\n" + " -m string MD5 crypt given string\n" + "\n", argv[0] + ); + + exit(1); + } + } + +#ifdef HAVE_TLS + if( (tls == 1) && (keys < 2) ) + { + fprintf(stderr, "Error: Missing private key or certificate file\n"); + exit(1); + } +#endif + + if( bound < 1 ) + { + fprintf(stderr, "Error: No sockets bound, unable to continue\n"); + exit(1); + } + + /* default docroot */ + if( !conf.docroot[0] && !realpath(".", conf.docroot) ) + { + fprintf(stderr, "Error: Can not determine default document root: %s\n", + strerror(errno)); + exit(1); + } + + /* default realm */ + if( ! conf.realm ) + conf.realm = "Protected Area"; + + /* config file */ + uh_config_parse(conf.file); + +#ifdef HAVE_CGI + /* default cgi prefix */ + if( ! conf.cgi_prefix ) + conf.cgi_prefix = "/cgi-bin"; +#endif + +#ifdef HAVE_LUA + /* load Lua plugin */ + if( ! (lua_lib = dlopen("uhttpd_lua.so", RTLD_LAZY | RTLD_GLOBAL)) ) + { + fprintf(stderr, + "Notice: Unable to load Lua plugin - disabling Lua support! " + "(Reason: %s)\n", dlerror() + ); + } + else + { + /* resolve functions */ + if( !(conf.lua_init = dlsym(lua_lib, "uh_lua_init")) || + !(conf.lua_close = dlsym(lua_lib, "uh_lua_close")) || + !(conf.lua_request = dlsym(lua_lib, "uh_lua_request")) + ) { + fprintf(stderr, + "Error: Failed to lookup required symbols " + "in Lua plugin: %s\n", dlerror() + ); + exit(1); + } + + /* init Lua runtime if handler is specified */ + if( conf.lua_handler ) + { + /* default lua prefix */ + if( ! conf.lua_prefix ) + conf.lua_prefix = "/lua"; + + L = conf.lua_init(conf.lua_handler); + } + } +#endif + + /* fork (if not disabled) */ + if( ! nofork ) + { + switch( fork() ) + { + case -1: + perror("fork()"); + exit(1); + + case 0: + /* daemon setup */ + if( chdir("/") ) + perror("chdir()"); + + if( (cur_fd = open("/dev/null", O_WRONLY)) > -1 ) + dup2(cur_fd, 0); + + if( (cur_fd = open("/dev/null", O_RDONLY)) > -1 ) + dup2(cur_fd, 1); + + if( (cur_fd = open("/dev/null", O_RDONLY)) > -1 ) + dup2(cur_fd, 2); + + break; + + default: + exit(0); + } + } + + /* backup server descriptor set */ + used_fds = serv_fds; + + /* loop */ + while(run) + { + /* create a working copy of the used fd set */ + read_fds = used_fds; + + /* sleep until socket activity */ + if( select(max_fd + 1, &read_fds, NULL, NULL, NULL) == -1 ) + { + perror("select()"); + exit(1); + } + + /* run through the existing connections looking for data to be read */ + for( cur_fd = 0; cur_fd <= max_fd; cur_fd++ ) + { + /* is a socket managed by us */ + if( FD_ISSET(cur_fd, &read_fds) ) + { + /* is one of our listen sockets */ + if( FD_ISSET(cur_fd, &serv_fds) ) + { + /* handle new connections */ + if( (new_fd = accept(cur_fd, NULL, 0)) != -1 ) + { + /* add to global client list */ + if( (cl = uh_client_add(new_fd, uh_listener_lookup(cur_fd))) != NULL ) + { +#ifdef HAVE_TLS + /* setup client tls context */ + if( conf.tls ) + conf.tls_accept(cl); +#endif + + /* add client socket to global fdset */ + FD_SET(new_fd, &used_fds); + max_fd = max(max_fd, new_fd); + } + + /* insufficient resources */ + else + { + fprintf(stderr, + "uh_client_add(): Can not manage more than " + "%i client sockets, connection dropped\n", + UH_LIMIT_CLIENTS + ); + + close(new_fd); + } + } + } + + /* is a client socket */ + else + { + if( ! (cl = uh_client_lookup(cur_fd)) ) + { + /* this should not happen! */ + fprintf(stderr, + "uh_client_lookup(): No entry for fd %i!\n", + cur_fd); + + goto cleanup; + } + + /* parse message header */ + if( (req = uh_http_header_recv(cl)) != NULL ) + { +#ifdef HAVE_LUA + /* Lua request? */ + if( L && uh_path_match(conf.lua_prefix, req->url) ) + { + conf.lua_request(cl, req, L); + } + else +#endif + /* dispatch request */ + if( (pin = uh_path_lookup(cl, req->url)) != NULL ) + { + /* auth ok? */ + if( uh_auth_check(cl, req, pin) ) + { +#ifdef HAVE_CGI + if( uh_path_match(conf.cgi_prefix, pin->name) ) + { + uh_cgi_request(cl, req, pin); + } + else +#endif + { + uh_file_request(cl, req, pin); + } + } + } + + /* 404 */ + else + { + uh_http_sendhf(cl, 404, "Not Found", + "No such file or directory"); + } + } + + /* 400 */ + else + { + uh_http_sendhf(cl, 400, "Bad Request", + "Malformed request received"); + } + +#ifdef HAVE_TLS + /* free client tls context */ + if( conf.tls ) + conf.tls_close(cl); +#endif + + cleanup: + + /* close client socket */ + close(cur_fd); + FD_CLR(cur_fd, &used_fds); + + /* remove from global client list */ + uh_client_remove(cur_fd); + } + } + } + } + +#ifdef HAVE_LUA + /* destroy the Lua state */ + if( L != NULL ) + conf.lua_close(L); +#endif + + return 0; +} + -- cgit v1.2.3