Fixed a couple of callscgi bugs.
[ashd.git] / src / htparser.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 <unistd.h>
21#include <stdio.h>
22#include <string.h>
23#include <sys/socket.h>
24#include <pwd.h>
25#include <errno.h>
26
27#ifdef HAVE_CONFIG_H
28#include <config.h>
29#endif
30#include <utils.h>
31#include <mt.h>
32#include <mtio.h>
33#include <log.h>
34#include <req.h>
35#include <proc.h>
36
37#include "htparser.h"
38
39static int plex;
40static char *pidfile = NULL;
41
42static void trimx(struct hthead *req)
43{
44 int i;
45
46 i = 0;
47 while(i < req->noheaders) {
48 if(!strncasecmp(req->headers[i][0], "x-ash-", 6)) {
49 free(req->headers[i][0]);
50 free(req->headers[i][1]);
51 free(req->headers[i]);
52 memmove(req->headers + i, req->headers + i + 1, sizeof(*req->headers) * (--req->noheaders - i));
53 } else {
54 i++;
55 }
56 }
57}
58
59static struct hthead *parsereq(FILE *in)
60{
61 struct hthead *req;
62 struct charbuf method, url, ver;
63 int c;
64
65 req = NULL;
66 bufinit(method);
67 bufinit(url);
68 bufinit(ver);
69 while(1) {
70 c = getc(in);
71 if(c == ' ') {
72 break;
73 } else if((c == EOF) || (c < 32) || (c >= 128)) {
74 goto fail;
75 } else {
76 bufadd(method, c);
77 }
78 }
79 while(1) {
80 c = getc(in);
81 if(c == ' ') {
82 break;
83 } else if((c == EOF) || (c < 32)) {
84 goto fail;
85 } else {
86 bufadd(url, c);
87 }
88 }
89 while(1) {
90 c = getc(in);
91 if(c == 10) {
92 break;
93 } else if(c == 13) {
94 } else if((c == EOF) || (c < 32) || (c >= 128)) {
95 goto fail;
96 } else {
97 bufadd(ver, c);
98 }
99 }
100 bufadd(method, 0);
101 bufadd(url, 0);
102 bufadd(ver, 0);
103 req = mkreq(method.b, url.b, ver.b);
104 if(parseheaders(req, in))
105 goto fail;
106 trimx(req);
107 goto out;
108
109fail:
110 if(req != NULL) {
111 freehthead(req);
112 req = NULL;
113 }
114out:
115 buffree(method);
116 buffree(url);
117 buffree(ver);
118 return(req);
119}
120
121static struct hthead *parseresp(FILE *in)
122{
123 struct hthead *req;
124 int code;
125 struct charbuf ver, msg;
126 int c;
127
128 req = NULL;
129 bufinit(ver);
130 bufinit(msg);
131 code = 0;
132 while(1) {
133 c = getc(in);
134 if(c == ' ') {
135 break;
136 } else if((c == EOF) || (c < 32) || (c >= 128)) {
137 goto fail;
138 } else {
139 bufadd(ver, c);
140 }
141 }
142 while(1) {
143 c = getc(in);
144 if(c == ' ') {
145 break;
146 } else if((c == EOF) || (c < '0') || (c > '9')) {
147 goto fail;
148 } else {
149 code = (code * 10) + (c - '0');
150 }
151 }
152 while(1) {
153 c = getc(in);
154 if(c == 10) {
155 break;
156 } else if(c == 13) {
157 } else if((c == EOF) || (c < 32)) {
158 goto fail;
159 } else {
160 bufadd(msg, c);
161 }
162 }
163 bufadd(msg, 0);
164 bufadd(ver, 0);
165 req = mkresp(code, msg.b, ver.b);
166 if(parseheaders(req, in))
167 goto fail;
168 goto out;
169
170fail:
171 if(req != NULL) {
172 freehthead(req);
173 req = NULL;
174 }
175out:
176 buffree(msg);
177 buffree(ver);
178 return(req);
179}
180
181static off_t passdata(FILE *in, FILE *out, off_t max)
182{
183 size_t read;
184 off_t total;
185 char buf[8192];
186
187 total = 0;
188 while(!feof(in) && ((max < 0) || (total < max))) {
189 read = sizeof(buf);
190 if(max >= 0)
191 read = min(max - total, read);
192 read = fread(buf, 1, read, in);
193 if(ferror(in))
194 return(-1);
195 if(fwrite(buf, 1, read, out) != read)
196 return(-1);
197 total += read;
198 }
199 return(total);
200}
201
202static int passchunks(FILE *in, FILE *out)
203{
204 char buf[8192];
205 size_t read;
206
207 do {
208 read = fread(buf, 1, sizeof(buf), in);
209 if(ferror(in))
210 return(-1);
211 fprintf(out, "%zx\r\n", read);
212 if(fwrite(buf, 1, read, out) != read)
213 return(-1);
214 fprintf(out, "\r\n");
215 } while(read > 0);
216 return(0);
217}
218
219static int hasheader(struct hthead *head, char *name, char *val)
220{
221 char *hd;
222
223 if((hd = getheader(head, name)) == NULL)
224 return(0);
225 return(!strcasecmp(hd, val));
226}
227
228void serve(FILE *in, struct conn *conn)
229{
230 int pfds[2];
231 FILE *out;
232 struct hthead *req, *resp;
233 char *hd, *p;
234 off_t dlen;
235
236 out = NULL;
237 req = resp = NULL;
238 while(1) {
239 if((req = parsereq(in)) == NULL)
240 break;
241 replrest(req, req->url);
242 if(req->rest[0] == '/')
243 replrest(req, req->rest + 1);
244 if((p = strchr(req->rest, '?')) != NULL)
245 *p = 0;
246
247 if((conn->initreq != NULL) && conn->initreq(conn, req))
248 break;
249
250 if(block(plex, EV_WRITE, 60) <= 0)
251 break;
252 if(socketpair(PF_UNIX, SOCK_STREAM, 0, pfds))
253 break;
254 if(sendreq(plex, req, pfds[0]))
255 break;
256 close(pfds[0]);
257 out = mtstdopen(pfds[1], 1, 600, "r+");
258
259 if((hd = getheader(req, "content-length")) != NULL) {
260 dlen = atoo(hd);
261 if(dlen > 0) {
262 if(passdata(in, out, dlen) != dlen)
263 break;
264 }
265 }
266 if(fflush(out))
267 break;
268 /* Make sure to send EOF */
269 shutdown(pfds[1], SHUT_WR);
270
271 if((resp = parseresp(out)) == NULL)
272 break;
273 replstr(&resp->ver, req->ver);
274
275 if(!strcmp(req->ver, "HTTP/1.0")) {
276 writeresp(in, resp);
277 fprintf(in, "\r\n");
278 if((hd = getheader(resp, "content-length")) != NULL) {
279 dlen = passdata(out, in, -1);
280 if(dlen != atoo(hd))
281 break;
282 if(!hasheader(req, "connection", "keep-alive"))
283 break;
284 } else {
285 passdata(out, in, -1);
286 break;
287 }
288 if(hasheader(req, "connection", "close") || hasheader(resp, "connection", "close"))
289 break;
290 } else if(!strcmp(req->ver, "HTTP/1.1")) {
291 if((hd = getheader(resp, "content-length")) != NULL) {
292 writeresp(in, resp);
293 fprintf(in, "\r\n");
294 dlen = passdata(out, in, -1);
295 if(dlen != atoo(hd))
296 break;
297 } else if(!getheader(resp, "transfer-encoding")) {
298 headappheader(resp, "Transfer-Encoding", "chunked");
299 writeresp(in, resp);
300 fprintf(in, "\r\n");
301 if(passchunks(out, in))
302 break;
303 } else {
304 writeresp(in, resp);
305 fprintf(in, "\r\n");
306 passdata(out, in, -1);
307 break;
308 }
309 if(hasheader(req, "connection", "close") || hasheader(resp, "connection", "close"))
310 break;
311 } else {
312 break;
313 }
314
315 fclose(out);
316 out = NULL;
317 freehthead(req);
318 freehthead(resp);
319 req = resp = NULL;
320 }
321
322 if(out != NULL)
323 fclose(out);
324 if(req != NULL)
325 freehthead(req);
326 if(resp != NULL)
327 freehthead(resp);
328 fclose(in);
329}
330
331static void plexwatch(struct muth *muth, va_list args)
332{
333 vavar(int, fd);
334 char *buf;
335 int ret;
336
337 while(1) {
338 block(fd, EV_READ, 0);
339 buf = smalloc(65536);
340 ret = recv(fd, buf, 65536, 0);
341 if(ret < 0) {
342 flog(LOG_WARNING, "received error on rootplex read channel: %s", strerror(errno));
343 exit(1);
344 } else if(ret == 0) {
345 exit(0);
346 }
347 /* Maybe I'd like to implement some protocol in this direction
348 * some day... */
349 free(buf);
350 }
351}
352
353static void usage(FILE *out)
354{
355 fprintf(out, "usage: htparser [-hSf] [-u USER] [-r ROOT] [-p PIDFILE] PORTSPEC... -- ROOT [ARGS...]\n");
356 fprintf(out, "\twhere PORTSPEC is HANDLER[:PAR[=VAL][(,PAR[=VAL])...]] (try HANDLER:help)\n");
357 fprintf(out, "\tavailable handlers are `plain' and `ssl'.\n");
358}
359
360static void addport(char *spec)
361{
362 char *nm, *p, *p2, *n;
363 struct charvbuf pars, vals;
364
365 bufinit(pars);
366 bufinit(vals);
367 if((p = strchr(spec, ':')) == NULL) {
368 nm = spec;
369 } else {
370 nm = spec;
371 *(p++) = 0;
372 do {
373 if((n = strchr(p, ',')) != NULL)
374 *(n++) = 0;
375 if((p2 = strchr(p, '=')) != NULL)
376 *(p2++) = 0;
377 if(!*p) {
378 usage(stderr);
379 exit(1);
380 }
381 bufadd(pars, p);
382 if(p2)
383 bufadd(vals, p2);
384 else
385 bufadd(vals, "");
386 } while((p = n) != NULL);
387 }
388
389 /* XXX: It would be nice to decentralize this, but, meh... */
390 if(!strcmp(nm, "plain")) {
391 handleplain(pars.d, pars.b, vals.b);
392#ifdef HAVE_GNUTLS
393 } else if(!strcmp(nm, "ssl")) {
394 handlegnussl(pars.d, pars.b, vals.b);
395#endif
396 } else {
397 flog(LOG_ERR, "htparser: unknown port handler `%s'", nm);
398 exit(1);
399 }
400
401 buffree(pars);
402 buffree(vals);
403}
404
405int main(int argc, char **argv)
406{
407 int c;
408 int i, s1;
409 int daemonize, logsys;
410 char *root;
411 FILE *pidout;
412 struct passwd *pwent;
413
414 daemonize = logsys = 0;
415 root = NULL;
416 pwent = NULL;
417 while((c = getopt(argc, argv, "+hSfu:r:p:")) >= 0) {
418 switch(c) {
419 case 'h':
420 usage(stdout);
421 exit(0);
422 case 'f':
423 daemonize = 1;
424 break;
425 case 'S':
426 logsys = 1;
427 break;
428 case 'u':
429 if((pwent = getpwnam(optarg)) == NULL) {
430 flog(LOG_ERR, "could not find user %s", optarg);
431 exit(1);
432 }
433 break;
434 case 'r':
435 root = optarg;
436 break;
437 case 'p':
438 pidfile = optarg;
439 break;
440 default:
441 usage(stderr);
442 exit(1);
443 }
444 }
445 s1 = 0;
446 for(i = optind; i < argc; i++) {
447 if(!strcmp(argv[i], "--"))
448 break;
449 s1 = 1;
450 addport(argv[i]);
451 }
452 if(!s1 || (i == argc)) {
453 usage(stderr);
454 exit(1);
455 }
456 if((plex = stdmkchild(argv + ++i)) < 0) {
457 flog(LOG_ERR, "could not spawn root multiplexer: %s", strerror(errno));
458 return(1);
459 }
460 mustart(plexwatch, plex);
461 pidout = NULL;
462 if(pidfile != NULL) {
463 if((pidout = fopen(pidfile, "w")) == NULL) {
464 flog(LOG_ERR, "could not open %s for writing: %s", pidfile, strerror(errno));
465 return(1);
466 }
467 }
468 if(logsys)
469 opensyslog();
470 if(root) {
471 if(chroot(root)) {
472 flog(LOG_ERR, "could not chroot to %s: %s", root, strerror(errno));
473 exit(1);
474 }
475 }
476 if(pwent) {
477 if(setgid(pwent->pw_gid)) {
478 flog(LOG_ERR, "could not switch group to %i: %s", (int)pwent->pw_gid, strerror(errno));
479 exit(1);
480 }
481 if(setuid(pwent->pw_uid)) {
482 flog(LOG_ERR, "could not switch user to %i: %s", (int)pwent->pw_uid, strerror(errno));
483 exit(1);
484 }
485 }
486 if(daemonize) {
487 daemon(0, 0);
488 }
489 if(pidout != NULL) {
490 fprintf(pidout, "%i\n", getpid());
491 fclose(pidout);
492 }
493 ioloop();
494 return(0);
495}