htpipe: Fixed simple initialization bug.
[ashd.git] / src / psendfile.c
... / ...
CommitLineData
1/*
2 ashd - A Sane HTTP Daemon
3 Copyright (C) 2008 Fredrik Tolf <fredrik@dolda2000.com>
4
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation, either version 3 of the License, or
8 (at your option) any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
17*/
18
19#include <stdlib.h>
20#include <string.h>
21#include <stdio.h>
22#include <unistd.h>
23#include <fcntl.h>
24#include <errno.h>
25#include <sys/stat.h>
26#include <stdint.h>
27#include <time.h>
28#include <signal.h>
29#include <magic.h>
30#include <locale.h>
31#include <langinfo.h>
32#include <sys/socket.h>
33
34#ifdef HAVE_CONFIG_H
35#include <config.h>
36#endif
37#include <utils.h>
38#include <log.h>
39#include <req.h>
40#include <resp.h>
41#include <mt.h>
42#include <mtio.h>
43
44#ifdef HAVE_XATTR
45#include <attr/xattr.h>
46#endif
47
48static magic_t cookie;
49
50static char *attrmimetype(char *file)
51{
52#ifdef HAVE_XATTR
53 char buf[1024];
54 int i;
55 ssize_t sz;
56
57 if((sz = getxattr(file, "user.ash-mime-type", buf, sizeof(buf) - 1)) > 0)
58 goto found;
59 if((sz = getxattr(file, "user.mime-type", buf, sizeof(buf) - 1)) > 0)
60 goto found;
61 if((sz = getxattr(file, "user.mime_type", buf, sizeof(buf) - 1)) > 0)
62 goto found;
63 if((sz = getxattr(file, "user.Content-Type", buf, sizeof(buf) - 1)) > 0)
64 goto found;
65 return(NULL);
66found:
67 for(i = 0; i < sz; i++) {
68 if((buf[i] < 32) || (buf[i] >= 128))
69 return(NULL);
70 }
71 buf[sz] = 0;
72 return(sstrdup(buf));
73#else
74 return(NULL);
75#endif
76}
77
78static char *getmimetype(char *file, struct stat *sb)
79{
80 char *ret;
81 const char *cret;
82
83 if((ret = attrmimetype(file)) != NULL)
84 return(ret);
85 if((cret = magic_file(cookie, file)) != NULL)
86 return(sstrdup(cret));
87 return(sstrdup("application/octet-stream"));
88}
89
90/* XXX: This could be made far better and check for other attributes
91 * and stuff, but not now. */
92static char *ckctype(char *ctype)
93{
94 char *buf;
95
96 if(!strncmp(ctype, "text/", 5) && (strchr(ctype, ';') == NULL)) {
97 buf = sprintf2("%s; charset=%s", ctype, nl_langinfo(CODESET));
98 free(ctype);
99 return(buf);
100 }
101 return(ctype);
102}
103
104static int checkcache(struct hthead *req, FILE *out, char *file, struct stat *sb)
105{
106 char *hdr;
107
108 if((hdr = getheader(req, "If-Modified-Since")) != NULL) {
109 if(parsehttpdate(hdr) < sb->st_mtime)
110 return(0);
111 fprintf(out, "HTTP/1.1 304 Not Modified\n");
112 fprintf(out, "Date: %s\n", fmthttpdate(time(NULL)));
113 fprintf(out, "Content-Length: 0\n");
114 fprintf(out, "\n");
115 return(1);
116 }
117 return(0);
118}
119
120static off_t passdata(FILE *in, FILE *out, off_t max)
121{
122 size_t read;
123 off_t total;
124 char buf[8192];
125
126 total = 0;
127 while(!feof(in) && ((max < 0) || (total < max))) {
128 read = sizeof(buf);
129 if(max >= 0)
130 read = min(max - total, read);
131 read = fread(buf, 1, read, in);
132 if(ferror(in))
133 return(-1);
134 if(fwrite(buf, 1, read, out) != read)
135 return(-1);
136 total += read;
137 }
138 return(total);
139}
140
141static void sendwhole(struct hthead *req, FILE *out, FILE *sfile, struct stat *sb, char *contype, int head)
142{
143 fprintf(out, "HTTP/1.1 200 OK\n");
144 fprintf(out, "Content-Type: %s\n", contype);
145 fprintf(out, "Content-Length: %ji\n", (intmax_t)sb->st_size);
146 fprintf(out, "Last-Modified: %s\n", fmthttpdate(sb->st_mtime));
147 fprintf(out, "Date: %s\n", fmthttpdate(time(NULL)));
148 fprintf(out, "\n");
149 if(!head)
150 passdata(sfile, out, -1);
151}
152
153static void sendrange(struct hthead *req, FILE *out, FILE *sfile, struct stat *sb, char *contype, char *spec, int head)
154{
155 char buf[strlen(spec) + 1];
156 char *p, *e;
157 off_t start, end;
158
159 if(strncmp(spec, "bytes=", 6))
160 goto error;
161 strcpy(buf, spec + 6);
162 if((p = strchr(buf, '-')) == NULL)
163 goto error;
164 if(p == buf) {
165 if(!p[1])
166 goto error;
167 end = sb->st_size;
168 start = end - strtoll(p + 1, &e, 10);
169 if(*e)
170 goto error;
171 if(start < 0)
172 start = 0;
173 } else {
174 *(p++) = 0;
175 start = strtoll(buf, &e, 10);
176 if(*e)
177 goto error;
178 if(*p) {
179 end = strtoll(p, &e, 10) + 1;
180 if(*e)
181 goto error;
182 } else {
183 end = sb->st_size;
184 }
185 }
186 if(start >= sb->st_size) {
187 fprintf(out, "HTTP/1.1 416 Not satisfiable\n");
188 fprintf(out, "Content-Range: */%ji\n", (intmax_t)sb->st_size);
189 fprintf(out, "Content-Length: 0\n");
190 fprintf(out, "Last-Modified: %s\n", fmthttpdate(sb->st_mtime));
191 fprintf(out, "Date: %s\n", fmthttpdate(time(NULL)));
192 fprintf(out, "\n");
193 return;
194 }
195 if((start < 0) || (start >= end))
196 goto error;
197 if(end > sb->st_size)
198 end = sb->st_size;
199 errno = 0;
200 if(fseeko(sfile, start, SEEK_SET)) {
201 simpleerror2(out, 500, "Internal Error", "Could not seek properly to beginning of requested byte range.");
202 flog(LOG_ERR, "sendfile: could not seek properly when serving partial content: %s", strerror(errno));
203 return;
204 }
205 fprintf(out, "HTTP/1.1 206 Partial content\n");
206 fprintf(out, "Content-Range: bytes %ji-%ji/%ji\n", (intmax_t)start, (intmax_t)(end - 1), (intmax_t)sb->st_size);
207 fprintf(out, "Content-Length: %ji\n", (intmax_t)(end - start));
208 fprintf(out, "Content-Type: %s\n", contype);
209 fprintf(out, "Last-Modified: %s\n", fmthttpdate(sb->st_mtime));
210 fprintf(out, "Date: %s\n", fmthttpdate(time(NULL)));
211 fprintf(out, "\n");
212 if(!head)
213 passdata(sfile, out, end - start);
214 return;
215
216error:
217 sendwhole(req, out, sfile, sb, contype, head);
218}
219
220static void serve(struct muth *muth, va_list args)
221{
222 vavar(struct hthead *, req);
223 vavar(int, fd);
224 FILE *out, *sfile;
225 int ishead;
226 char *file, *contype, *hdr;
227 struct stat sb;
228
229 sfile = NULL;
230 contype = NULL;
231 out = mtstdopen(fd, 1, 60, "r+", NULL);
232
233 if((file = getheader(req, "X-Ash-File")) == NULL) {
234 flog(LOG_ERR, "psendfile: needs to be called with the X-Ash-File header");
235 simpleerror2(out, 500, "Internal Error", "The server is incorrectly configured.");
236 goto out;
237 }
238 if(*req->rest) {
239 simpleerror2(out, 404, "Not Found", "The requested URL has no corresponding resource.");
240 goto out;
241 }
242 if(((sfile = fopen(file, "r")) == NULL) || fstat(fileno(sfile), &sb)) {
243 flog(LOG_ERR, "psendfile: could not stat input file %s: %s", file, strerror(errno));
244 simpleerror2(out, 500, "Internal Error", "The server could not access its own data.");
245 goto out;
246 }
247 if(!strcasecmp(req->method, "get")) {
248 ishead = 0;
249 } else if(!strcasecmp(req->method, "head")) {
250 ishead = 1;
251 } else {
252 simpleerror2(out, 405, "Method not allowed", "The requested method is not defined for this resource.");
253 goto out;
254 }
255 if((hdr = getheader(req, "X-Ash-Content-Type")) == NULL)
256 contype = getmimetype(file, &sb);
257 else
258 contype = sstrdup(hdr);
259 contype = ckctype(contype);
260
261 if(checkcache(req, out, file, &sb))
262 goto out;
263
264 if((hdr = getheader(req, "Range")) != NULL)
265 sendrange(req, out, sfile, &sb, contype, hdr, ishead);
266 else
267 sendwhole(req, out, sfile, &sb, contype, ishead);
268
269out:
270 if(sfile != NULL)
271 fclose(sfile);
272 if(contype != NULL)
273 free(contype);
274 fclose(out);
275 freehthead(req);
276}
277
278static void listenloop(struct muth *muth, va_list args)
279{
280 vavar(int, lfd);
281 int fd;
282 struct hthead *req;
283
284 while(1) {
285 block(lfd, EV_READ, 0);
286 if((fd = recvreq(lfd, &req)) < 0) {
287 if(errno != 0)
288 flog(LOG_ERR, "recvreq: %s", strerror(errno));
289 break;
290 }
291 mustart(serve, req, fd);
292 }
293}
294
295static void sigterm(int sig)
296{
297 shutdown(0, SHUT_RDWR);
298}
299
300static void usage(FILE *out)
301{
302 fprintf(out, "usage: psendfile [-h]\n");
303}
304
305int main(int argc, char **argv)
306{
307 int c;
308
309 setlocale(LC_ALL, "");
310 while((c = getopt(argc, argv, "h")) >= 0) {
311 switch(c) {
312 case 'h':
313 usage(stdout);
314 exit(0);
315 default:
316 usage(stderr);
317 exit(1);
318 }
319 }
320 cookie = magic_open(MAGIC_MIME_TYPE | MAGIC_SYMLINK);
321 magic_load(cookie, NULL);
322 mustart(listenloop, 0);
323 signal(SIGINT, sigterm);
324 signal(SIGTERM, sigterm);
325 ioloop();
326 return(0);
327}