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439 lines
9.4 KiB
C
439 lines
9.4 KiB
C
/*
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* uhttpd - Tiny single-threaded httpd - Static file handler
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*
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* Copyright (C) 2010-2012 Jo-Philipp Wich <xm@subsignal.org>
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define _XOPEN_SOURCE 500 /* strptime() */
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#define _BSD_SOURCE /* scandir(), timegm() */
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#include "uhttpd.h"
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#include "uhttpd-utils.h"
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#include "uhttpd-file.h"
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#include "uhttpd-mimetypes.h"
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static const char * uh_file_mime_lookup(const char *path)
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{
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struct mimetype *m = &uh_mime_types[0];
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const char *e;
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while (m->extn)
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{
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e = &path[strlen(path)-1];
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while (e >= path)
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{
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if ((*e == '.' || *e == '/') && !strcasecmp(&e[1], m->extn))
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return m->mime;
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e--;
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}
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m++;
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}
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return "application/octet-stream";
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}
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static const char * uh_file_mktag(struct stat *s)
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{
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static char tag[128];
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snprintf(tag, sizeof(tag), "\"%x-%x-%x\"",
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(unsigned int) s->st_ino,
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(unsigned int) s->st_size,
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(unsigned int) s->st_mtime);
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return tag;
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}
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static time_t uh_file_date2unix(const char *date)
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{
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struct tm t;
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memset(&t, 0, sizeof(t));
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if (strptime(date, "%a, %d %b %Y %H:%M:%S %Z", &t) != NULL)
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return timegm(&t);
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return 0;
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}
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static char * uh_file_unix2date(time_t ts)
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{
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static char str[128];
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struct tm *t = gmtime(&ts);
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strftime(str, sizeof(str), "%a, %d %b %Y %H:%M:%S GMT", t);
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return str;
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}
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static char * uh_file_header_lookup(struct client *cl, const char *name)
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{
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int i;
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foreach_header(i, cl->request.headers)
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{
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if (!strcasecmp(cl->request.headers[i], name))
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return cl->request.headers[i+1];
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}
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return NULL;
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}
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static int uh_file_response_ok_hdrs(struct client *cl, struct stat *s)
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{
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ensure_ret(uh_http_sendf(cl, NULL, "Connection: close\r\n"));
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if (s)
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{
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ensure_ret(uh_http_sendf(cl, NULL, "ETag: %s\r\n", uh_file_mktag(s)));
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ensure_ret(uh_http_sendf(cl, NULL, "Last-Modified: %s\r\n",
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uh_file_unix2date(s->st_mtime)));
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}
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return uh_http_sendf(cl, NULL, "Date: %s\r\n", uh_file_unix2date(time(NULL)));
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}
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static int uh_file_response_200(struct client *cl, struct stat *s)
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{
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ensure_ret(uh_http_sendf(cl, NULL, "%s 200 OK\r\n",
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http_versions[cl->request.version]));
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return uh_file_response_ok_hdrs(cl, s);
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}
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static int uh_file_response_304(struct client *cl, struct stat *s)
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{
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ensure_ret(uh_http_sendf(cl, NULL, "%s 304 Not Modified\r\n",
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http_versions[cl->request.version]));
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return uh_file_response_ok_hdrs(cl, s);
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}
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static int uh_file_response_412(struct client *cl)
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{
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return uh_http_sendf(cl, NULL,
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"%s 412 Precondition Failed\r\n"
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"Connection: close\r\n",
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http_versions[cl->request.version]);
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}
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static int uh_file_if_match(struct client *cl, struct stat *s, int *ok)
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{
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const char *tag = uh_file_mktag(s);
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char *hdr = uh_file_header_lookup(cl, "If-Match");
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char *p;
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int i;
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if (hdr)
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{
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p = &hdr[0];
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for (i = 0; i < strlen(hdr); i++)
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{
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if ((hdr[i] == ' ') || (hdr[i] == ','))
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{
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hdr[i++] = 0;
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p = &hdr[i];
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}
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else if (!strcmp(p, "*") || !strcmp(p, tag))
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{
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*ok = 1;
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return *ok;
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}
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}
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*ok = 0;
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ensure_ret(uh_file_response_412(cl));
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return *ok;
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}
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*ok = 1;
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return *ok;
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}
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static int uh_file_if_modified_since(struct client *cl, struct stat *s, int *ok)
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{
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char *hdr = uh_file_header_lookup(cl, "If-Modified-Since");
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*ok = 1;
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if (hdr)
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{
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if (uh_file_date2unix(hdr) >= s->st_mtime)
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{
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*ok = 0;
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ensure_ret(uh_file_response_304(cl, s));
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}
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}
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return *ok;
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}
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static int uh_file_if_none_match(struct client *cl, struct stat *s, int *ok)
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{
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const char *tag = uh_file_mktag(s);
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char *hdr = uh_file_header_lookup(cl, "If-None-Match");
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char *p;
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int i;
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*ok = 1;
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if (hdr)
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{
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p = &hdr[0];
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for (i = 0; i < strlen(hdr); i++)
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{
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if ((hdr[i] == ' ') || (hdr[i] == ','))
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{
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hdr[i++] = 0;
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p = &hdr[i];
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}
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else if (!strcmp(p, "*") || !strcmp(p, tag))
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{
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*ok = 0;
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if ((cl->request.method == UH_HTTP_MSG_GET) ||
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(cl->request.method == UH_HTTP_MSG_HEAD))
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{
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ensure_ret(uh_file_response_304(cl, s));
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}
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else
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{
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ensure_ret(uh_file_response_412(cl));
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}
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break;
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}
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}
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}
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return *ok;
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}
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static int uh_file_if_range(struct client *cl, struct stat *s, int *ok)
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{
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char *hdr = uh_file_header_lookup(cl, "If-Range");
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*ok = 1;
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if (hdr)
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{
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*ok = 0;
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ensure_ret(uh_file_response_412(cl));
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}
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return *ok;
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}
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static int uh_file_if_unmodified_since(struct client *cl, struct stat *s,
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int *ok)
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{
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char *hdr = uh_file_header_lookup(cl, "If-Unmodified-Since");
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*ok = 1;
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if (hdr)
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{
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if (uh_file_date2unix(hdr) <= s->st_mtime)
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{
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*ok = 0;
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ensure_ret(uh_file_response_412(cl));
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}
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}
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return *ok;
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}
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static int uh_file_scandir_filter_dir(const struct dirent *e)
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{
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return strcmp(e->d_name, ".") ? 1 : 0;
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}
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static void uh_file_dirlist(struct client *cl, struct path_info *pi)
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{
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int i;
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int count = 0;
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char filename[PATH_MAX];
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char *pathptr;
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struct dirent **files = NULL;
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struct stat s;
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ensure_out(uh_http_sendf(cl, &cl->request,
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"<html><head><title>Index of %s</title></head>"
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"<body><h1>Index of %s</h1><hr /><ol>",
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pi->name, pi->name));
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if ((count = scandir(pi->phys, &files, uh_file_scandir_filter_dir,
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alphasort)) > 0)
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{
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memset(filename, 0, sizeof(filename));
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memcpy(filename, pi->phys, sizeof(filename));
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pathptr = &filename[strlen(filename)];
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/* list subdirs */
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for (i = 0; i < count; i++)
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{
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strncat(filename, files[i]->d_name,
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sizeof(filename) - strlen(files[i]->d_name));
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if (!stat(filename, &s) &&
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(s.st_mode & S_IFDIR) && (s.st_mode & S_IXOTH))
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{
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ensure_out(uh_http_sendf(cl, &cl->request,
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"<li><strong><a href='%s%s'>%s</a>/"
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"</strong><br /><small>modified: %s"
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"<br />directory - %.02f kbyte<br />"
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"<br /></small></li>",
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pi->name, files[i]->d_name,
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files[i]->d_name,
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uh_file_unix2date(s.st_mtime),
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s.st_size / 1024.0));
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}
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*pathptr = 0;
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}
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/* list files */
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for (i = 0; i < count; i++)
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{
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strncat(filename, files[i]->d_name,
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sizeof(filename) - strlen(files[i]->d_name));
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if (!stat(filename, &s) &&
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!(s.st_mode & S_IFDIR) && (s.st_mode & S_IROTH))
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{
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ensure_out(uh_http_sendf(cl, &cl->request,
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"<li><strong><a href='%s%s'>%s</a>"
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"</strong><br /><small>modified: %s"
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"<br />%s - %.02f kbyte<br />"
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"<br /></small></li>",
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pi->name, files[i]->d_name,
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files[i]->d_name,
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uh_file_unix2date(s.st_mtime),
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uh_file_mime_lookup(filename),
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s.st_size / 1024.0));
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}
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*pathptr = 0;
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}
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}
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ensure_out(uh_http_sendf(cl, &cl->request, "</ol><hr /></body></html>"));
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ensure_out(uh_http_sendf(cl, &cl->request, ""));
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out:
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if (files)
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{
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for (i = 0; i < count; i++)
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free(files[i]);
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free(files);
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}
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}
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bool uh_file_request(struct client *cl, struct path_info *pi)
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{
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int rlen;
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int ok = 1;
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int fd = -1;
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char buf[UH_LIMIT_MSGHEAD];
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/* we have a file */
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if ((pi->stat.st_mode & S_IFREG) && ((fd = open(pi->phys, O_RDONLY)) > 0))
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{
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/* test preconditions */
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if (ok) ensure_out(uh_file_if_modified_since(cl, &pi->stat, &ok));
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if (ok) ensure_out(uh_file_if_match(cl, &pi->stat, &ok));
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if (ok) ensure_out(uh_file_if_range(cl, &pi->stat, &ok));
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if (ok) ensure_out(uh_file_if_unmodified_since(cl, &pi->stat, &ok));
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if (ok) ensure_out(uh_file_if_none_match(cl, &pi->stat, &ok));
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if (ok > 0)
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{
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/* write status */
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ensure_out(uh_file_response_200(cl, &pi->stat));
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ensure_out(uh_http_sendf(cl, NULL, "Content-Type: %s\r\n",
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uh_file_mime_lookup(pi->name)));
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ensure_out(uh_http_sendf(cl, NULL, "Content-Length: %i\r\n",
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pi->stat.st_size));
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/* if request was HTTP 1.1 we'll respond chunked */
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if ((cl->request.version > 1.0) &&
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(cl->request.method != UH_HTTP_MSG_HEAD))
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{
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ensure_out(uh_http_send(cl, NULL,
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"Transfer-Encoding: chunked\r\n", -1));
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}
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/* close header */
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ensure_out(uh_http_send(cl, NULL, "\r\n", -1));
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/* send body */
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if (cl->request.method != UH_HTTP_MSG_HEAD)
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{
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/* pump file data */
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while ((rlen = read(fd, buf, sizeof(buf))) > 0)
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ensure_out(uh_http_send(cl, &cl->request, buf, rlen));
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/* send trailer in chunked mode */
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ensure_out(uh_http_send(cl, &cl->request, "", 0));
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}
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}
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/* one of the preconditions failed, terminate opened header and exit */
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else
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{
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ensure_out(uh_http_send(cl, NULL, "\r\n", -1));
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}
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}
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/* directory */
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else if ((pi->stat.st_mode & S_IFDIR) && !cl->server->conf->no_dirlists)
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{
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/* write status */
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ensure_out(uh_file_response_200(cl, NULL));
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if (cl->request.version > 1.0)
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ensure_out(uh_http_send(cl, NULL,
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"Transfer-Encoding: chunked\r\n", -1));
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ensure_out(uh_http_send(cl, NULL,
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"Content-Type: text/html\r\n\r\n", -1));
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/* content */
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uh_file_dirlist(cl, pi);
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}
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/* 403 */
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else
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{
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ensure_out(uh_http_sendhf(cl, 403, "Forbidden",
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"Access to this resource is forbidden"));
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}
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out:
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if (fd > -1)
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close(fd);
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return false;
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}
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