callscgi: Fixed a couple of simple bugs.
[ashd.git] / src / callscgi.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/*
20 * XXX: All the various ways to start a child process makes this
21 * program quite ugly at the moment. It is unclear whether it is
22 * meaningfully possible to unify them better than they currently are.
23 */
24
25#include <stdlib.h>
26#include <stdio.h>
27#include <unistd.h>
28#include <string.h>
29#include <fcntl.h>
30#include <ctype.h>
31#include <sys/socket.h>
32#include <sys/un.h>
33#include <netinet/in.h>
34#include <netdb.h>
35#include <sys/signal.h>
36#include <errno.h>
37
38#ifdef HAVE_CONFIG_H
39#include <config.h>
40#endif
41#include <utils.h>
42#include <req.h>
43#include <log.h>
44#include <mt.h>
45#include <mtio.h>
46
47static char **progspec;
48static char *sockid, *unspec, *inspec;
49static int nolisten;
50static struct sockaddr *curaddr;
51static size_t caddrlen;
52static int cafamily, isanon;
53static pid_t child;
54
55static struct addrinfo *resolv(int flags)
56{
57 int ret;
58 struct addrinfo *ai, h;
59 char *name, *srv, *p;
60
61 if((p = strchr(inspec, ':')) != NULL) {
62 name = smalloc(p - inspec + 1);
63 memcpy(name, inspec, p - inspec);
64 name[p - inspec] = 0;
65 srv = p + 1;
66 } else {
67 name = sstrdup("localhost");
68 srv = inspec;
69 }
70 memset(&h, 0, sizeof(h));
71 h.ai_family = AF_UNSPEC;
72 h.ai_socktype = SOCK_STREAM;
73 h.ai_flags = flags;
74 ret = getaddrinfo(name, srv, &h, &ai);
75 free(name);
76 if(ret != 0) {
77 flog(LOG_ERR, "could not resolve TCP specification `%s': %s", inspec, gai_strerror(ret));
78 exit(1);
79 }
80 return(ai);
81}
82
83static char *mksockid(char *sockid)
84{
85 char *home;
86
87 home = getenv("HOME");
88 if(home && !access(sprintf3("%s/.ashd/sockets/", home), X_OK))
89 return(sprintf3("%s/.ashd/sockets/scgi-p-%s", home, sockid));
90 return(sprintf3("/tmp/scgi-%i-%s", getuid(), sockid));
91}
92
93static char *mkanonid(void)
94{
95 char *home;
96 char *tmpl;
97 int fd;
98
99 home = getenv("HOME");
100 if(home && !access(sprintf3("%s/.ashd/sockets/", home), X_OK))
1376c0cd 101 tmpl = sprintf2("%s/.ashd/sockets/scgi-a-XXXXXX", home);
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102 else
103 tmpl = sprintf2("/tmp/scgi-a-%i-XXXXXX", getuid());
104 if((fd = mkstemp(tmpl)) < 0) {
105 flog(LOG_ERR, "could not create anonymous socket `%s': %s", tmpl, strerror(errno));
106 exit(1);
107 }
1376c0cd 108 close(fd);
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109 unlink(tmpl);
110 return(tmpl);
111}
112
113static void startlisten(void)
114{
115 int i, fd;
116 struct addrinfo *ai, *cai;
117 char *unpath;
118 struct sockaddr_un unm;
119 char *aname;
120
121 isanon = 0;
122 if(inspec != NULL) {
123 fd = -1;
124 for(cai = ai = resolv(AI_PASSIVE); cai != NULL; cai = cai->ai_next) {
125 if((fd = socket(cai->ai_family, cai->ai_socktype, cai->ai_protocol)) < 0)
126 continue;
127 if(bind(fd, cai->ai_addr, cai->ai_addrlen)) {
128 close(fd);
129 fd = -1;
130 continue;
131 }
132 if(listen(fd, 128)) {
133 close(fd);
134 fd = -1;
135 continue;
136 }
137 break;
138 }
139 freeaddrinfo(ai);
140 if(fd < 0) {
141 flog(LOG_ERR, "could not bind to specified TCP address: %s", strerror(errno));
142 exit(1);
143 }
144 } else if((unspec != NULL) || (sockid != NULL)) {
145 if((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
146 flog(LOG_ERR, "could not create Unix socket: %s", strerror(errno));
147 exit(1);
148 }
149 if(unspec != NULL)
150 unpath = unspec;
151 else
152 unpath = mksockid(sockid);
153 unlink(unpath);
154 unm.sun_family = AF_UNIX;
155 strcpy(unm.sun_path, unpath);
156 if(bind(fd, (struct sockaddr *)&unm, sizeof(unm))) {
157 flog(LOG_ERR, "could not bind Unix socket to `%s': %s", unspec, strerror(errno));
158 exit(1);
159 }
160 if(listen(fd, 128)) {
161 flog(LOG_ERR, "listen: %s", strerror(errno));
162 exit(1);
163 }
164 } else {
165 if((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
166 flog(LOG_ERR, "could not create Unix socket: %s", strerror(errno));
167 exit(1);
168 }
169 memset(&unm, 0, sizeof(unm));
170 aname = mkanonid();
171 unm.sun_family = AF_UNIX;
172 strcpy(unm.sun_path, aname);
173 free(aname);
174 if(bind(fd, (struct sockaddr *)&unm, sizeof(unm))) {
175 flog(LOG_ERR, "could not bind Unix socket to `%s': %s", unspec, strerror(errno));
176 exit(1);
177 }
178 if(listen(fd, 128)) {
179 flog(LOG_ERR, "listen: %s", strerror(errno));
180 exit(1);
181 }
182
183 curaddr = smalloc(caddrlen = sizeof(unm));
184 memcpy(curaddr, &unm, sizeof(unm));
185 cafamily = AF_UNIX;
186 isanon = 1;
187 }
188 if((child = fork()) < 0) {
189 flog(LOG_ERR, "could not fork: %s", strerror(errno));
190 exit(1);
191 }
192 if(child == 0) {
193 dup2(fd, 0);
194 for(i = 3; i < FD_SETSIZE; i++)
195 close(i);
196 execvp(*progspec, progspec);
197 exit(127);
198 }
199 close(fd);
200}
201
202static void startnolisten(void)
203{
02cb2a3d 204 int i, fd;
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205
206 if((child = fork()) < 0) {
207 flog(LOG_ERR, "could not fork: %s", strerror(errno));
208 exit(1);
209 }
210 if(child == 0) {
211 for(i = 3; i < FD_SETSIZE; i++)
212 close(i);
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213 if((fd = open("/dev/null", O_RDONLY)) < 0) {
214 flog(LOG_ERR, "/dev/null: %s", strerror(errno));
215 exit(127);
216 }
217 dup2(fd, 0);
218 close(fd);
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219 execvp(*progspec, progspec);
220 exit(127);
221 }
222}
223
224static int sconnect(void)
225{
226 int fd;
227 int err;
228 socklen_t errlen;
229
230 fd = socket(cafamily, SOCK_STREAM, 0);
231 fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
232 while(1) {
233 if(connect(fd, curaddr, caddrlen)) {
234 if(errno == EINPROGRESS) {
235 block(fd, EV_WRITE, 30);
236 errlen = sizeof(err);
237 if(getsockopt(fd, SOL_SOCKET, SO_ERROR, &err, &errlen) || ((errno = err) != 0)) {
238 close(fd);
239 return(-1);
240 }
241 return(fd);
242 }
243 close(fd);
244 return(-1);
245 }
246 return(fd);
247 }
248}
249
250static int econnect(void)
251{
252 int fd;
253 struct addrinfo *ai, *cai;
254 int tries;
255 char *unpath;
256 struct sockaddr_un unm;
257
258 tries = 0;
259retry:
260 if(inspec != NULL) {
261 fd = -1;
262 for(cai = ai = resolv(0); cai != NULL; cai = cai->ai_next) {
263 if((fd = socket(cai->ai_family, cai->ai_socktype, cai->ai_protocol)) < 0)
264 continue;
265 if(connect(fd, cai->ai_addr, cai->ai_addrlen)) {
266 close(fd);
267 fd = -1;
268 continue;
269 }
270 break;
271 }
f89ce57a 272 if(fd < 0) {
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FT
273 if(tries++ < nolisten) {
274 sleep(1);
275 goto retry;
276 }
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277 flog(LOG_ERR, "could not connect to specified TCP address: %s", strerror(errno));
278 exit(1);
279 }
280 curaddr = smalloc(caddrlen = cai->ai_addrlen);
281 memcpy(curaddr, cai->ai_addr, caddrlen);
282 cafamily = cai->ai_family;
283 isanon = 0;
284 freeaddrinfo(ai);
285 return(fd);
286 } else if((unspec != NULL) || (sockid != NULL)) {
287 if((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
288 flog(LOG_ERR, "could not create Unix socket: %s", strerror(errno));
289 exit(1);
290 }
291 if(unspec != NULL)
292 unpath = unspec;
293 else
294 unpath = mksockid(sockid);
295 unlink(unpath);
296 unm.sun_family = AF_UNIX;
297 strcpy(unm.sun_path, unpath);
298 if(connect(fd, (struct sockaddr *)&unm, sizeof(unm))) {
299 close(fd);
300 if(tries++ < nolisten) {
301 sleep(1);
302 goto retry;
303 }
304 flog(LOG_ERR, "could not connect to Unix socket `%s': %s", unspec, strerror(errno));
305 exit(1);
306 }
307 curaddr = smalloc(caddrlen = sizeof(unm));
308 memcpy(curaddr, &unm, sizeof(unm));
309 cafamily = AF_UNIX;
310 isanon = 0;
311 return(fd);
312 } else {
313 flog(LOG_ERR, "servescgi: cannot use an anonymous socket without a program to start");
314 exit(1);
315 }
316}
317
318static int startconn(void)
319{
320 if(*progspec) {
321 if(nolisten == 0)
322 startlisten();
323 else
324 startnolisten();
325 }
326 if(curaddr != NULL)
327 return(sconnect());
328 return(econnect());
329}
330
331static void killcuraddr(void)
332{
333 if(curaddr == NULL)
334 return;
335 if(isanon) {
336 unlink(((struct sockaddr_un *)curaddr)->sun_path);
337 if(child > 0)
338 kill(child, SIGTERM);
339 }
340 free(curaddr);
341 curaddr = NULL;
342}
343
344static int reconn(void)
345{
346 int fd;
347
348 if(curaddr != NULL) {
349 if((fd = sconnect()) >= 0)
350 return(fd);
351 killcuraddr();
352 }
353 return(startconn());
354}
355
356static off_t passdata(FILE *in, FILE *out)
357{
358 size_t read;
359 off_t total;
360 char buf[8192];
361
362 total = 0;
363 while(!feof(in)) {
364 read = fread(buf, 1, sizeof(buf), in);
365 if(ferror(in))
366 return(-1);
367 if(fwrite(buf, 1, read, out) != read)
368 return(-1);
369 total += read;
370 }
371 return(total);
372}
373
374static void bufaddenv(struct charbuf *dst, char *name, char *fmt, ...)
375{
376 va_list args;
377
378 bufcatstr2(*dst, name);
379 va_start(args, fmt);
380 bvprintf(dst, fmt, args);
381 va_end(args);
382 bufadd(*dst, 0);
383}
384
385static char *absolutify(char *file)
386{
387 static int inited = 0;
388 static char cwd[1024];
389
390 if(*file != '/') {
391 if(!inited) {
392 getcwd(cwd, sizeof(cwd));
393 inited = 1;
394 }
395 return(sprintf2("%s/%s", cwd, file));
396 }
397 return(sstrdup(file));
398}
399
400/* Mostly copied from callcgi. */
401static void mkcgienv(struct hthead *req, struct charbuf *dst)
402{
403 int i;
404 char *url, *qp, *h, *p;
405
406 bufaddenv(dst, "SERVER_SOFTWARE", "ashd/%s", VERSION);
407 bufaddenv(dst, "GATEWAY_INTERFACE", "CGI/1.1");
408 bufaddenv(dst, "SCGI", "1");
409 bufaddenv(dst, "SERVER_PROTOCOL", "%s", req->ver);
410 bufaddenv(dst, "REQUEST_METHOD", "%s", req->method);
411 bufaddenv(dst, "REQUEST_URI", "%s", req->url);
412 if(*req->rest)
413 bufaddenv(dst, "PATH_INFO", "/%s", req->rest);
414 else
415 bufaddenv(dst, "PATH_INFO", "");
416 url = sstrdup(req->url);
417 if((qp = strchr(url, '?')) != NULL)
418 *(qp++) = 0;
419 /* XXX: This is an ugly hack (I think), but though I can think of
420 * several alternatives, none seem to be better. */
421 if(*req->rest && (strlen(url) > strlen(req->rest)) &&
422 !strcmp(req->rest, url + strlen(url) - strlen(req->rest)) &&
423 (url[strlen(url) - strlen(req->rest) - 1] == '/')) {
424 bufaddenv(dst, "SCRIPT_NAME", "%.*s", (int)(strlen(url) - strlen(req->rest) - 1), url);
425 } else {
426 bufaddenv(dst, "SCRIPT_NAME", "%s", url);
427 }
428 bufaddenv(dst, "QUERY_STRING", "%s", qp?qp:"");
429 if((h = getheader(req, "Host")) != NULL)
430 bufaddenv(dst, "SERVER_NAME", "%s", h);
431 if((h = getheader(req, "X-Ash-Server-Port")) != NULL)
432 bufaddenv(dst, "SERVER_PORT", "%s", h);
433 if(((h = getheader(req, "X-Ash-Server-Protocol")) != NULL) && !strcmp(h, "https"))
434 bufaddenv(dst, "HTTPS", "on");
435 if((h = getheader(req, "X-Ash-Address")) != NULL)
436 bufaddenv(dst, "REMOTE_ADDR", "%s", h);
437 if((h = getheader(req, "Content-Type")) != NULL)
438 bufaddenv(dst, "CONTENT_TYPE", "%s", h);
439 if((h = getheader(req, "Content-Length")) != NULL)
440 bufaddenv(dst, "CONTENT_LENGTH", "%s", h);
441 else
442 bufaddenv(dst, "CONTENT_LENGTH", "0");
443 if((h = getheader(req, "X-Ash-File")) != NULL)
444 bufaddenv(dst, "SCRIPT_FILENAME", "%s", absolutify(h));
445 for(i = 0; i < req->noheaders; i++) {
02cb2a3d 446 h = sprintf2("HTTP_%s", req->headers[i][0]);
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FT
447 for(p = h; *p; p++) {
448 if(isalnum(*p))
449 *p = toupper(*p);
450 else
451 *p = '_';
452 }
453 bufcatstr2(*dst, h);
454 free(h);
455 bufcatstr2(*dst, req->headers[i][1]);
456 }
457}
458
459static char *defstatus(int code)
460{
461 if(code == 200)
462 return("OK");
463 else if(code == 201)
464 return("Created");
465 else if(code == 202)
466 return("Accepted");
467 else if(code == 204)
468 return("No Content");
469 else if(code == 300)
470 return("Multiple Choices");
471 else if(code == 301)
472 return("Moved Permanently");
473 else if(code == 302)
474 return("Found");
475 else if(code == 303)
476 return("See Other");
477 else if(code == 304)
478 return("Not Modified");
479 else if(code == 307)
480 return("Moved Temporarily");
481 else if(code == 400)
482 return("Bad Request");
483 else if(code == 401)
484 return("Unauthorized");
485 else if(code == 403)
486 return("Forbidden");
487 else if(code == 404)
488 return("Not Found");
489 else if(code == 500)
490 return("Internal Server Error");
491 else if(code == 501)
492 return("Not Implemented");
493 else if(code == 503)
494 return("Service Unavailable");
495 else
496 return("Unknown status");
497}
498
499static struct hthead *parseresp(FILE *in)
500{
501 struct hthead *resp;
502 char *st, *p;
503
504 omalloc(resp);
505 resp->ver = sstrdup("HTTP/1.1");
506 if(parseheaders(resp, in)) {
507 freehthead(resp);
508 return(NULL);
509 }
510 if((st = getheader(resp, "Status")) != NULL) {
511 if((p = strchr(st, ' ')) != NULL) {
512 *(p++) = 0;
513 resp->code = atoi(st);
514 resp->msg = sstrdup(p);
515 } else {
516 resp->code = atoi(st);
517 resp->msg = sstrdup(defstatus(resp->code));
518 }
519 headrmheader(resp, "Status");
520 } else if(getheader(resp, "Location")) {
521 resp->code = 303;
522 resp->msg = sstrdup("See Other");
523 } else {
524 resp->code = 200;
525 resp->msg = sstrdup("OK");
526 }
527 return(resp);
528}
529
530static void serve(struct muth *muth, va_list args)
531{
532 vavar(struct hthead *, req);
533 vavar(int, fd);
534 vavar(int, sfd);
535 FILE *is, *os;
536 struct charbuf head;
537 struct hthead *resp;
538
539 sfd = reconn();
540 is = mtstdopen(fd, 1, 60, "r+");
541 os = mtstdopen(sfd, 1, 600, "r+");
542
543 bufinit(head);
544 mkcgienv(req, &head);
545 fprintf(os, "%zi:", head.d);
546 fwrite(head.b, head.d, 1, os);
547 fputc(',', os);
548 buffree(head);
549 if(passdata(is, os) < 0)
550 goto out;
551
552 if((resp = parseresp(os)) == NULL)
553 goto out;
554 writeresp(is, resp);
555 freehthead(resp);
556 fputc('\n', is);
557 if(passdata(os, is) < 0)
558 goto out;
559
560out:
561 freehthead(req);
562 fclose(is);
563 fclose(os);
564}
565
566static void listenloop(struct muth *muth, va_list args)
567{
568 vavar(int, lfd);
569 int fd;
570 struct hthead *req;
571
572 while(1) {
573 block(0, EV_READ, 0);
574 if((fd = recvreq(lfd, &req)) < 0) {
575 if(errno != 0)
576 flog(LOG_ERR, "recvreq: %s", strerror(errno));
577 break;
578 }
579 mustart(serve, req, fd);
580 }
581}
582
583static void usage(FILE *out)
584{
585 fprintf(out, "usage: servescgi [-h] [-N RETRIES] [-i ID] [-u UNIX-PATH] [-t [HOST:]TCP-PORT] [PROGRAM [ARGS...]]\n");
586}
587
588int main(int argc, char **argv)
589{
590 int c;
591
592 while((c = getopt(argc, argv, "+hN:i:u:t:")) >= 0) {
593 switch(c) {
594 case 'h':
595 usage(stdout);
596 exit(0);
597 case 'N':
598 nolisten = atoi(optarg);
599 break;
600 case 'i':
601 sockid = optarg;
602 break;
603 case 'u':
604 unspec = optarg;
605 break;
606 case 't':
607 inspec = optarg;
608 break;
609 default:
610 usage(stderr);
611 exit(1);
612 }
613 }
614 progspec = argv + optind;
615 if(((sockid != NULL) + (unspec != NULL) + (inspec != NULL)) > 1) {
616 flog(LOG_ERR, "servescgi: at most one of -i, -u or -t may be given");
617 exit(1);
618 }
619 signal(SIGCHLD, SIG_IGN);
620 mustart(listenloop, 0);
621 atexit(killcuraddr);
622 ioloop();
623 return(0);
624}