callcgi: Fixed possible deadlock problem on aborted requests.
[ashd.git] / src / psendfile.c
CommitLineData
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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 <magic.h>
29#include <locale.h>
30#include <langinfo.h>
31#include <sys/socket.h>
32
33#ifdef HAVE_CONFIG_H
34#include <config.h>
35#endif
36#include <utils.h>
37#include <log.h>
38#include <req.h>
39#include <resp.h>
40#include <mt.h>
41#include <mtio.h>
42
43#ifdef HAVE_XATTR
44#include <attr/xattr.h>
45#endif
46
47static magic_t cookie;
48
49static char *attrmimetype(char *file)
50{
51#ifdef HAVE_XATTR
52 char buf[1024];
53 int i;
54 ssize_t sz;
55
56 if((sz = getxattr(file, "user.ash-mime-type", buf, sizeof(buf) - 1)) > 0)
57 goto found;
58 if((sz = getxattr(file, "user.mime-type", buf, sizeof(buf) - 1)) > 0)
59 goto found;
60 if((sz = getxattr(file, "user.mime_type", buf, sizeof(buf) - 1)) > 0)
61 goto found;
62 if((sz = getxattr(file, "user.Content-Type", buf, sizeof(buf) - 1)) > 0)
63 goto found;
64 return(NULL);
65found:
66 for(i = 0; i < sz; i++) {
67 if((buf[i] < 32) || (buf[i] >= 128))
68 return(NULL);
69 }
70 buf[sz] = 0;
71 return(sstrdup(buf));
72#else
73 return(NULL);
74#endif
75}
76
77static char *getmimetype(char *file, struct stat *sb)
78{
79 char *ret;
80 const char *cret;
81
82 if((ret = attrmimetype(file)) != NULL)
83 return(ret);
84 if((cret = magic_file(cookie, file)) != NULL)
85 return(sstrdup(cret));
86 return(sstrdup("application/octet-stream"));
87}
88
89/* XXX: This could be made far better and check for other attributes
90 * and stuff, but not now. */
91static char *ckctype(char *ctype)
92{
93 char *buf;
94
95 if(!strncmp(ctype, "text/", 5) && (strchr(ctype, ';') == NULL)) {
96 buf = sprintf2("%s; charset=%s", ctype, nl_langinfo(CODESET));
97 free(ctype);
98 return(buf);
99 }
100 return(ctype);
101}
102
103static int checkcache(struct hthead *req, FILE *out, char *file, struct stat *sb)
104{
105 char *hdr;
106
107 if((hdr = getheader(req, "If-Modified-Since")) != NULL) {
108 if(parsehttpdate(hdr) < sb->st_mtime)
109 return(0);
110 fprintf(out, "HTTP/1.1 304 Not Modified\n");
111 fprintf(out, "Date: %s\n", fmthttpdate(time(NULL)));
112 fprintf(out, "Content-Length: 0\n");
113 fprintf(out, "\n");
114 return(1);
115 }
116 return(0);
117}
118
119static off_t passdata(FILE *in, FILE *out, off_t max)
120{
121 size_t read;
122 off_t total;
123 char buf[8192];
124
125 total = 0;
126 while(!feof(in) && ((max < 0) || (total < max))) {
127 read = sizeof(buf);
128 if(max >= 0)
129 read = min(max - total, read);
130 read = fread(buf, 1, read, in);
131 if(ferror(in))
132 return(-1);
133 if(fwrite(buf, 1, read, out) != read)
134 return(-1);
135 total += read;
136 }
137 return(total);
138}
139
140static void sendwhole(struct hthead *req, FILE *out, FILE *sfile, struct stat *sb, char *contype, int head)
141{
142 fprintf(out, "HTTP/1.1 200 OK\n");
143 fprintf(out, "Content-Type: %s\n", contype);
144 fprintf(out, "Content-Length: %ji\n", (intmax_t)sb->st_size);
145 fprintf(out, "Last-Modified: %s\n", fmthttpdate(sb->st_mtime));
146 fprintf(out, "Date: %s\n", fmthttpdate(time(NULL)));
147 fprintf(out, "\n");
148 if(!head)
149 passdata(sfile, out, -1);
150}
151
152static void sendrange(struct hthead *req, FILE *out, FILE *sfile, struct stat *sb, char *contype, char *spec, int head)
153{
154 char buf[strlen(spec) + 1];
155 char *p, *e;
156 off_t start, end;
157
158 if(strncmp(spec, "bytes=", 6))
159 goto error;
160 strcpy(buf, spec + 6);
161 if((p = strchr(buf, '-')) == NULL)
162 goto error;
163 if(p == buf) {
164 if(!p[1])
165 goto error;
166 end = sb->st_size;
167 start = end - strtoll(p + 1, &e, 10);
168 if(*e)
169 goto error;
170 if(start < 0)
171 start = 0;
172 } else {
173 *(p++) = 0;
174 start = strtoll(buf, &e, 10);
175 if(*e)
176 goto error;
177 if(*p) {
178 end = strtoll(p, &e, 10) + 1;
179 if(*e)
180 goto error;
181 } else {
182 end = sb->st_size;
183 }
184 }
185 if(start >= sb->st_size) {
186 fprintf(out, "HTTP/1.1 416 Not satisfiable\n");
187 fprintf(out, "Content-Range: */%ji\n", (intmax_t)sb->st_size);
188 fprintf(out, "Content-Length: 0\n");
189 fprintf(out, "Last-Modified: %s\n", fmthttpdate(sb->st_mtime));
190 fprintf(out, "Date: %s\n", fmthttpdate(time(NULL)));
191 fprintf(out, "\n");
192 return;
193 }
194 if((start < 0) || (start >= end))
195 goto error;
196 if(end > sb->st_size)
197 end = sb->st_size;
198 errno = 0;
199 if(fseeko(sfile, start, SEEK_SET)) {
200 simpleerror2(out, 500, "Internal Error", "Could not seek properly to beginning of requested byte range.");
201 flog(LOG_ERR, "sendfile: could not seek properly when serving partial content: %s", strerror(errno));
202 return;
203 }
204 fprintf(out, "HTTP/1.1 206 Partial content\n");
205 fprintf(out, "Content-Range: bytes %ji-%ji/%ji\n", (intmax_t)start, (intmax_t)(end - 1), (intmax_t)sb->st_size);
206 fprintf(out, "Content-Length: %ji\n", (intmax_t)(end - start));
207 fprintf(out, "Content-Type: %s\n", contype);
208 fprintf(out, "Last-Modified: %s\n", fmthttpdate(sb->st_mtime));
209 fprintf(out, "Date: %s\n", fmthttpdate(time(NULL)));
210 fprintf(out, "\n");
211 if(!head)
212 passdata(sfile, out, end - start);
213 return;
214
215error:
216 sendwhole(req, out, sfile, sb, contype, head);
217}
218
219static void serve(struct muth *muth, va_list args)
220{
221 vavar(struct hthead *, req);
222 vavar(int, fd);
223 FILE *out, *sfile;
224 int ishead;
225 char *file, *contype, *hdr;
226 struct stat sb;
227
228 sfile = NULL;
229 contype = NULL;
b71ad67f 230 out = mtstdopen(fd, 1, 60, "r+", NULL);
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231
232 if((file = getheader(req, "X-Ash-File")) == NULL) {
233 flog(LOG_ERR, "psendfile: needs to be called with the X-Ash-File header");
234 simpleerror2(out, 500, "Internal Error", "The server is incorrectly configured.");
235 goto out;
236 }
237 if(*req->rest) {
238 simpleerror2(out, 404, "Not Found", "The requested URL has no corresponding resource.");
239 goto out;
240 }
107712e3 241 if(((sfile = fopen(file, "r")) == NULL) || fstat(fileno(sfile), &sb)) {
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242 flog(LOG_ERR, "psendfile: could not stat input file %s: %s", file, strerror(errno));
243 simpleerror2(out, 500, "Internal Error", "The server could not access its own data.");
244 goto out;
245 }
246 if(!strcasecmp(req->method, "get")) {
247 ishead = 0;
248 } else if(!strcasecmp(req->method, "head")) {
249 ishead = 1;
250 } else {
251 simpleerror2(out, 405, "Method not allowed", "The requested method is not defined for this resource.");
252 goto out;
253 }
254 if((hdr = getheader(req, "X-Ash-Content-Type")) == NULL)
255 contype = getmimetype(file, &sb);
256 else
257 contype = sstrdup(hdr);
258 contype = ckctype(contype);
259
260 if(checkcache(req, out, file, &sb))
261 goto out;
262
263 if((hdr = getheader(req, "Range")) != NULL)
264 sendrange(req, out, sfile, &sb, contype, hdr, ishead);
265 else
266 sendwhole(req, out, sfile, &sb, contype, ishead);
267
268out:
269 if(sfile != NULL)
270 fclose(sfile);
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271 if(contype != NULL)
272 free(contype);
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273 fclose(out);
274 freehthead(req);
275}
276
277static void listenloop(struct muth *muth, va_list args)
278{
279 vavar(int, lfd);
280 int fd;
281 struct hthead *req;
282
283 while(1) {
284 block(lfd, EV_READ, 0);
285 if((fd = recvreq(lfd, &req)) < 0) {
286 if(errno != 0)
287 flog(LOG_ERR, "recvreq: %s", strerror(errno));
288 break;
289 }
290 mustart(serve, req, fd);
291 }
292}
293
294static void sigterm(int sig)
295{
296 shutdown(0, SHUT_RDWR);
297}
298
299static void usage(FILE *out)
300{
301 fprintf(out, "usage: psendfile [-h]\n");
302}
303
304int main(int argc, char **argv)
305{
306 int c;
307
308 setlocale(LC_ALL, "");
309 while((c = getopt(argc, argv, "h")) >= 0) {
310 switch(c) {
311 case 'h':
312 usage(stdout);
313 exit(0);
314 default:
315 usage(stderr);
316 exit(1);
317 }
318 }
319 cookie = magic_open(MAGIC_MIME_TYPE | MAGIC_SYMLINK);
320 magic_load(cookie, NULL);
321 mustart(listenloop, 0);
322 signal(SIGINT, sigterm);
323 signal(SIGTERM, sigterm);
324 ioloop();
325 return(0);
326}