/* * uhttpd - Tiny single-threaded httpd - Static file handler * * 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 /* strptime() */ #define _BSD_SOURCE /* scandir(), timegm() */ #include "uhttpd.h" #include "uhttpd-utils.h" #include "uhttpd-file.h" #include "uhttpd-mimetypes.h" static const char * uh_file_mime_lookup(const char *path) { struct mimetype *m = &uh_mime_types[0]; const char *e; while( m->extn ) { e = &path[strlen(path)-1]; while( e >= path ) { if( (*e == '.') && !strcasecmp(&e[1], m->extn) ) return m->mime; e--; } m++; } return "application/octet-stream"; } static const char * uh_file_mktag(struct stat *s) { static char tag[128]; snprintf(tag, sizeof(tag), "\"%x-%x-%x\"", (unsigned int) s->st_ino, (unsigned int) s->st_size, (unsigned int) s->st_mtime ); return tag; } static time_t uh_file_date2unix(const char *date) { struct tm t; memset(&t, 0, sizeof(t)); if( strptime(date, "%a, %d %b %Y %H:%M:%S %Z", &t) != NULL ) return timegm(&t); return 0; } static char * uh_file_unix2date(time_t ts) { static char str[128]; struct tm *t = gmtime(&ts); strftime(str, sizeof(str), "%a, %d %b %Y %H:%M:%S GMT", t); return str; } static char * uh_file_header_lookup(struct http_request *req, const char *name) { int i; foreach_header(i, req->headers) { if( ! strcasecmp(req->headers[i], name) ) return req->headers[i+1]; } return NULL; } #define ensure_ret(x) \ do { if( x < 0 ) return; } while(0) static void uh_file_response_ok_hdrs(struct client *cl, struct http_request *req, struct stat *s) { ensure_ret(uh_http_sendf(cl, NULL, "Connection: close\r\n")); if( s ) { ensure_ret(uh_http_sendf(cl, NULL, "ETag: %s\r\n", uh_file_mktag(s))); ensure_ret(uh_http_sendf(cl, NULL, "Last-Modified: %s\r\n", uh_file_unix2date(s->st_mtime))); } ensure_ret(uh_http_sendf(cl, NULL, "Date: %s\r\n", uh_file_unix2date(time(NULL)))); } static void uh_file_response_200(struct client *cl, struct http_request *req, struct stat *s) { ensure_ret(uh_http_sendf(cl, NULL, "HTTP/%.1f 200 OK\r\n", req->version)); uh_file_response_ok_hdrs(cl, req, s); } static void uh_file_response_304(struct client *cl, struct http_request *req, struct stat *s) { ensure_ret(uh_http_sendf(cl, NULL, "HTTP/%.1f 304 Not Modified\r\n", req->version)); uh_file_response_ok_hdrs(cl, req, s); } static void uh_file_response_412(struct client *cl, struct http_request *req) { ensure_ret(uh_http_sendf(cl, NULL, "HTTP/%.1f 412 Precondition Failed\r\n" "Connection: close\r\n", req->version)); } static int uh_file_if_match(struct client *cl, struct http_request *req, struct stat *s) { const char *tag = uh_file_mktag(s); char *hdr = uh_file_header_lookup(req, "If-Match"); char *p; int i; if( hdr ) { p = &hdr[0]; for( i = 0; i < strlen(hdr); i++ ) { if( (hdr[i] == ' ') || (hdr[i] == ',') ) { hdr[i++] = 0; p = &hdr[i]; } else if( !strcmp(p, "*") || !strcmp(p, tag) ) { return 1; } } uh_file_response_412(cl, req); return 0; } return 1; } static int uh_file_if_modified_since(struct client *cl, struct http_request *req, struct stat *s) { char *hdr = uh_file_header_lookup(req, "If-Modified-Since"); if( hdr ) { if( uh_file_date2unix(hdr) < s->st_mtime ) { return 1; } else { uh_file_response_304(cl, req, s); return 0; } } return 1; } static int uh_file_if_none_match(struct client *cl, struct http_request *req, struct stat *s) { const char *tag = uh_file_mktag(s); char *hdr = uh_file_header_lookup(req, "If-None-Match"); char *p; int i; if( hdr ) { p = &hdr[0]; for( i = 0; i < strlen(hdr); i++ ) { if( (hdr[i] == ' ') || (hdr[i] == ',') ) { hdr[i++] = 0; p = &hdr[i]; } else if( !strcmp(p, "*") || !strcmp(p, tag) ) { if( (req->method == UH_HTTP_MSG_GET) || (req->method == UH_HTTP_MSG_HEAD) ) uh_file_response_304(cl, req, s); else uh_file_response_412(cl, req); return 0; } } } return 1; } static int uh_file_if_range(struct client *cl, struct http_request *req, struct stat *s) { char *hdr = uh_file_header_lookup(req, "If-Range"); if( hdr ) { uh_file_response_412(cl, req); return 0; } return 1; } static int uh_file_if_unmodified_since(struct client *cl, struct http_request *req, struct stat *s) { char *hdr = uh_file_header_lookup(req, "If-Unmodified-Since"); if( hdr ) { if( uh_file_date2unix(hdr) <= s->st_mtime ) { uh_file_response_412(cl, req); return 0; } } return 1; } #define ensure_out(x) \ do { if( x < 0 ) goto out; } while(0) static int uh_file_scandir_filter_dir(const struct dirent *e) { return strcmp(e->d_name, ".") ? 1 : 0; } static void uh_file_dirlist(struct client *cl, struct http_request *req, struct path_info *pi) { int i; int count = 0; char filename[PATH_MAX]; char *pathptr; struct dirent **files = NULL; struct stat s; ensure_out(uh_http_sendf(cl, req, "Index of %s" "

Index of %s


    ", pi->name, pi->name )); if( (count = scandir(pi->phys, &files, uh_file_scandir_filter_dir, alphasort)) > 0 ) { memset(filename, 0, sizeof(filename)); memcpy(filename, pi->phys, sizeof(filename)); pathptr = &filename[strlen(filename)]; /* list subdirs */ for( i = 0; i < count; i++ ) { strncat(filename, files[i]->d_name, sizeof(filename) - strlen(files[i]->d_name)); if( !stat(filename, &s) && (s.st_mode & S_IFDIR) && (s.st_mode & S_IXOTH) ) ensure_out(uh_http_sendf(cl, req, "
  1. %s/
    " "modified: %s
    directory - %.02f kbyte" "

  2. ", pi->name, files[i]->d_name, files[i]->d_name, uh_file_unix2date(s.st_mtime), s.st_size / 1024.0 )); *pathptr = 0; } /* list files */ for( i = 0; i < count; i++ ) { strncat(filename, files[i]->d_name, sizeof(filename) - strlen(files[i]->d_name)); if( !stat(filename, &s) && !(s.st_mode & S_IFDIR) && (s.st_mode & S_IROTH) ) ensure_out(uh_http_sendf(cl, req, "
  3. %s
    " "modified: %s
    %s - %.02f kbyte
    " "
  4. ", pi->name, files[i]->d_name, files[i]->d_name, uh_file_unix2date(s.st_mtime), uh_file_mime_lookup(filename), s.st_size / 1024.0 )); *pathptr = 0; } } ensure_out(uh_http_sendf(cl, req, "

")); ensure_out(uh_http_sendf(cl, req, "")); out: if( files ) { for( i = 0; i < count; i++ ) free(files[i]); free(files); } } void uh_file_request(struct client *cl, struct http_request *req, struct path_info *pi) { int rlen; int fd = -1; char buf[UH_LIMIT_MSGHEAD]; /* we have a file */ if( (pi->stat.st_mode & S_IFREG) && ((fd = open(pi->phys, O_RDONLY)) > 0) ) { /* test preconditions */ if( uh_file_if_modified_since(cl, req, &pi->stat) && uh_file_if_match(cl, req, &pi->stat) && uh_file_if_range(cl, req, &pi->stat) && uh_file_if_unmodified_since(cl, req, &pi->stat) && uh_file_if_none_match(cl, req, &pi->stat) ) { /* write status */ uh_file_response_200(cl, req, &pi->stat); ensure_out(uh_http_sendf(cl, NULL, "Content-Type: %s\r\n", uh_file_mime_lookup(pi->name))); ensure_out(uh_http_sendf(cl, NULL, "Content-Length: %i\r\n", pi->stat.st_size)); /* if request was HTTP 1.1 we'll respond chunked */ if( (req->version > 1.0) && (req->method != UH_HTTP_MSG_HEAD) ) ensure_out(uh_http_send(cl, NULL, "Transfer-Encoding: chunked\r\n", -1)); /* close header */ ensure_out(uh_http_send(cl, NULL, "\r\n", -1)); /* send body */ if( req->method != UH_HTTP_MSG_HEAD ) { /* pump file data */ while( (rlen = read(fd, buf, sizeof(buf))) > 0 ) ensure_out(uh_http_send(cl, req, buf, rlen)); /* send trailer in chunked mode */ ensure_out(uh_http_send(cl, req, "", 0)); } } /* one of the preconditions failed, terminate opened header and exit */ else { ensure_out(uh_http_send(cl, NULL, "\r\n", -1)); } } /* directory */ else if( (pi->stat.st_mode & S_IFDIR) && !cl->server->conf->no_dirlists ) { /* write status */ uh_file_response_200(cl, req, NULL); if( req->version > 1.0 ) ensure_out(uh_http_send(cl, NULL, "Transfer-Encoding: chunked\r\n", -1)); ensure_out(uh_http_send(cl, NULL, "Content-Type: text/html\r\n\r\n", -1)); /* content */ uh_file_dirlist(cl, req, pi); } /* 403 */ else { ensure_out(uh_http_sendhf(cl, 403, "Forbidden", "Access to this resource is forbidden")); } out: if( fd > -1 ) close(fd); }