Commit | Line | Data |
---|---|---|
f0bbedf7 FT |
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> | |
d341283f | 22 | #include <fcntl.h> |
f4cdf919 | 23 | #include <string.h> |
f4cdf919 | 24 | #include <sys/socket.h> |
f0cbd8d7 | 25 | #include <pwd.h> |
15fa3fe8 | 26 | #include <sys/signal.h> |
f4cdf919 | 27 | #include <errno.h> |
f0bbedf7 FT |
28 | |
29 | #ifdef HAVE_CONFIG_H | |
30 | #include <config.h> | |
31 | #endif | |
32 | #include <utils.h> | |
f4cdf919 | 33 | #include <mt.h> |
83723896 | 34 | #include <mtio.h> |
f4cdf919 | 35 | #include <log.h> |
66987955 | 36 | #include <req.h> |
9d87a119 | 37 | #include <proc.h> |
f4cdf919 | 38 | |
8774c31b | 39 | #include "htparser.h" |
f4cdf919 | 40 | |
8774c31b | 41 | static int plex; |
43c58ba2 | 42 | static char *pidfile = NULL; |
d341283f | 43 | static int daemonize, usesyslog; |
f4cdf919 | 44 | |
df431d1d FT |
45 | static void trimx(struct hthead *req) |
46 | { | |
47 | int i; | |
48 | ||
49 | i = 0; | |
50 | while(i < req->noheaders) { | |
51 | if(!strncasecmp(req->headers[i][0], "x-ash-", 6)) { | |
52 | free(req->headers[i][0]); | |
53 | free(req->headers[i][1]); | |
54 | free(req->headers[i]); | |
55 | memmove(req->headers + i, req->headers + i + 1, sizeof(*req->headers) * (--req->noheaders - i)); | |
56 | } else { | |
57 | i++; | |
58 | } | |
59 | } | |
60 | } | |
61 | ||
5fc1bf9f | 62 | static struct hthead *parsereq(FILE *in) |
66987955 | 63 | { |
5fc1bf9f FT |
64 | struct hthead *req; |
65 | struct charbuf method, url, ver; | |
66 | int c; | |
66987955 | 67 | |
5fc1bf9f FT |
68 | req = NULL; |
69 | bufinit(method); | |
70 | bufinit(url); | |
71 | bufinit(ver); | |
72 | while(1) { | |
73 | c = getc(in); | |
74 | if(c == ' ') { | |
75 | break; | |
76 | } else if((c == EOF) || (c < 32) || (c >= 128)) { | |
77 | goto fail; | |
78 | } else { | |
79 | bufadd(method, c); | |
90b0ba0f FT |
80 | if(method.d >= 128) |
81 | goto fail; | |
66987955 | 82 | } |
c9955b14 | 83 | } |
c9955b14 | 84 | while(1) { |
5fc1bf9f FT |
85 | c = getc(in); |
86 | if(c == ' ') { | |
c9955b14 | 87 | break; |
5fc1bf9f FT |
88 | } else if((c == EOF) || (c < 32)) { |
89 | goto fail; | |
90 | } else { | |
91 | bufadd(url, c); | |
90b0ba0f FT |
92 | if(url.d >= 65536) |
93 | goto fail; | |
66987955 FT |
94 | } |
95 | } | |
66987955 | 96 | while(1) { |
5fc1bf9f FT |
97 | c = getc(in); |
98 | if(c == 10) { | |
66987955 | 99 | break; |
5fc1bf9f FT |
100 | } else if(c == 13) { |
101 | } else if((c == EOF) || (c < 32) || (c >= 128)) { | |
c9955b14 | 102 | goto fail; |
5fc1bf9f FT |
103 | } else { |
104 | bufadd(ver, c); | |
90b0ba0f FT |
105 | if(ver.d >= 128) |
106 | goto fail; | |
5fc1bf9f | 107 | } |
66987955 | 108 | } |
5fc1bf9f FT |
109 | bufadd(method, 0); |
110 | bufadd(url, 0); | |
111 | bufadd(ver, 0); | |
112 | req = mkreq(method.b, url.b, ver.b); | |
113 | if(parseheaders(req, in)) | |
114 | goto fail; | |
df431d1d | 115 | trimx(req); |
5fc1bf9f | 116 | goto out; |
c9955b14 FT |
117 | |
118 | fail: | |
5fc1bf9f FT |
119 | if(req != NULL) { |
120 | freehthead(req); | |
121 | req = NULL; | |
122 | } | |
123 | out: | |
124 | buffree(method); | |
125 | buffree(url); | |
126 | buffree(ver); | |
127 | return(req); | |
66987955 FT |
128 | } |
129 | ||
5fc1bf9f | 130 | static struct hthead *parseresp(FILE *in) |
9d87a119 | 131 | { |
5fc1bf9f | 132 | struct hthead *req; |
9d87a119 | 133 | int code; |
5fc1bf9f FT |
134 | struct charbuf ver, msg; |
135 | int c; | |
9d87a119 | 136 | |
5fc1bf9f FT |
137 | req = NULL; |
138 | bufinit(ver); | |
139 | bufinit(msg); | |
140 | code = 0; | |
9d87a119 | 141 | while(1) { |
5fc1bf9f FT |
142 | c = getc(in); |
143 | if(c == ' ') { | |
9d87a119 | 144 | break; |
5fc1bf9f | 145 | } else if((c == EOF) || (c < 32) || (c >= 128)) { |
9d87a119 | 146 | goto fail; |
5fc1bf9f FT |
147 | } else { |
148 | bufadd(ver, c); | |
e2b404ab FT |
149 | if(ver.d >= 128) |
150 | goto fail; | |
5fc1bf9f FT |
151 | } |
152 | } | |
153 | while(1) { | |
154 | c = getc(in); | |
155 | if(c == ' ') { | |
156 | break; | |
157 | } else if((c == EOF) || (c < '0') || (c > '9')) { | |
9d87a119 | 158 | goto fail; |
5fc1bf9f FT |
159 | } else { |
160 | code = (code * 10) + (c - '0'); | |
e2b404ab FT |
161 | if(code >= 10000) |
162 | goto fail; | |
5fc1bf9f FT |
163 | } |
164 | } | |
165 | while(1) { | |
166 | c = getc(in); | |
167 | if(c == 10) { | |
168 | break; | |
169 | } else if(c == 13) { | |
170 | } else if((c == EOF) || (c < 32)) { | |
9d87a119 | 171 | goto fail; |
5fc1bf9f FT |
172 | } else { |
173 | bufadd(msg, c); | |
e2b404ab FT |
174 | if(msg.d >= 512) |
175 | goto fail; | |
5fc1bf9f | 176 | } |
9d87a119 | 177 | } |
5fc1bf9f FT |
178 | bufadd(msg, 0); |
179 | bufadd(ver, 0); | |
180 | req = mkresp(code, msg.b, ver.b); | |
181 | if(parseheaders(req, in)) | |
182 | goto fail; | |
183 | goto out; | |
9d87a119 FT |
184 | |
185 | fail: | |
5fc1bf9f FT |
186 | if(req != NULL) { |
187 | freehthead(req); | |
188 | req = NULL; | |
189 | } | |
190 | out: | |
191 | buffree(msg); | |
192 | buffree(ver); | |
193 | return(req); | |
9d87a119 FT |
194 | } |
195 | ||
5fc1bf9f | 196 | static off_t passdata(FILE *in, FILE *out, off_t max) |
9d87a119 | 197 | { |
5fc1bf9f FT |
198 | size_t read; |
199 | off_t total; | |
200 | char buf[8192]; | |
201 | ||
202 | total = 0; | |
f9255ddd | 203 | while(!feof(in) && ((max < 0) || (total < max))) { |
5fc1bf9f FT |
204 | read = sizeof(buf); |
205 | if(max >= 0) | |
a701d7b7 | 206 | read = min(max - total, read); |
5fc1bf9f FT |
207 | read = fread(buf, 1, read, in); |
208 | if(ferror(in)) | |
209 | return(-1); | |
210 | if(fwrite(buf, 1, read, out) != read) | |
211 | return(-1); | |
212 | total += read; | |
9d87a119 | 213 | } |
5fc1bf9f FT |
214 | return(total); |
215 | } | |
216 | ||
217 | static int passchunks(FILE *in, FILE *out) | |
218 | { | |
219 | char buf[8192]; | |
220 | size_t read; | |
221 | ||
222 | do { | |
223 | read = fread(buf, 1, sizeof(buf), in); | |
224 | if(ferror(in)) | |
225 | return(-1); | |
f9255ddd | 226 | fprintf(out, "%zx\r\n", read); |
5fc1bf9f FT |
227 | if(fwrite(buf, 1, read, out) != read) |
228 | return(-1); | |
229 | fprintf(out, "\r\n"); | |
230 | } while(read > 0); | |
231 | return(0); | |
232 | } | |
233 | ||
234 | static int hasheader(struct hthead *head, char *name, char *val) | |
235 | { | |
236 | char *hd; | |
237 | ||
238 | if((hd = getheader(head, name)) == NULL) | |
239 | return(0); | |
240 | return(!strcasecmp(hd, val)); | |
9d87a119 FT |
241 | } |
242 | ||
8774c31b | 243 | void serve(FILE *in, struct conn *conn) |
66987955 | 244 | { |
af34331c | 245 | int pfds[2]; |
8774c31b | 246 | FILE *out; |
9d87a119 | 247 | struct hthead *req, *resp; |
5fc1bf9f FT |
248 | char *hd, *p; |
249 | off_t dlen; | |
66987955 | 250 | |
5fc1bf9f | 251 | out = NULL; |
3c296bd4 | 252 | req = resp = NULL; |
66987955 | 253 | while(1) { |
5fc1bf9f FT |
254 | if((req = parsereq(in)) == NULL) |
255 | break; | |
256 | replrest(req, req->url); | |
9e9eca79 FT |
257 | if(req->rest[0] == '/') |
258 | replrest(req, req->rest + 1); | |
edad3c6a FT |
259 | if((p = strchr(req->rest, '?')) != NULL) |
260 | *p = 0; | |
9d87a119 | 261 | |
8774c31b FT |
262 | if((conn->initreq != NULL) && conn->initreq(conn, req)) |
263 | break; | |
264 | ||
46c3d430 | 265 | if(block(plex, EV_WRITE, 60) <= 0) |
5fc1bf9f | 266 | break; |
af34331c | 267 | if(socketpair(PF_UNIX, SOCK_STREAM, 0, pfds)) |
5fc1bf9f | 268 | break; |
af34331c | 269 | if(sendreq(plex, req, pfds[0])) |
5fc1bf9f | 270 | break; |
af34331c | 271 | close(pfds[0]); |
5fc1bf9f | 272 | out = mtstdopen(pfds[1], 1, 600, "r+"); |
a0327573 | 273 | |
a0327573 FT |
274 | if((hd = getheader(req, "content-length")) != NULL) { |
275 | dlen = atoo(hd); | |
a06a2fbd | 276 | if(dlen > 0) { |
5fc1bf9f FT |
277 | if(passdata(in, out, dlen) != dlen) |
278 | break; | |
a06a2fbd | 279 | } |
a0327573 | 280 | } |
5fc1bf9f FT |
281 | if(fflush(out)) |
282 | break; | |
d93d9a05 | 283 | /* Make sure to send EOF */ |
5fc1bf9f | 284 | shutdown(pfds[1], SHUT_WR); |
9d87a119 | 285 | |
f9255ddd FT |
286 | if((resp = parseresp(out)) == NULL) |
287 | break; | |
5fc1bf9f | 288 | replstr(&resp->ver, req->ver); |
1c3e0167 FT |
289 | |
290 | if(!getheader(resp, "server")) | |
291 | headappheader(resp, "Server", sprintf3("ashd/%s", VERSION)); | |
5fc1bf9f FT |
292 | |
293 | if(!strcmp(req->ver, "HTTP/1.0")) { | |
294 | writeresp(in, resp); | |
295 | fprintf(in, "\r\n"); | |
18fb436d FT |
296 | if(!strcasecmp(req->method, "head")) { |
297 | if(!hasheader(req, "connection", "keep-alive")) | |
298 | break; | |
299 | } else if((hd = getheader(resp, "content-length")) != NULL) { | |
5226f7c5 FT |
300 | dlen = atoo(hd); |
301 | if(passdata(out, in, dlen) != dlen) | |
5fc1bf9f FT |
302 | break; |
303 | if(!hasheader(req, "connection", "keep-alive")) | |
9d87a119 | 304 | break; |
5fc1bf9f FT |
305 | } else { |
306 | passdata(out, in, -1); | |
307 | break; | |
9d87a119 | 308 | } |
5fc1bf9f FT |
309 | if(hasheader(req, "connection", "close") || hasheader(resp, "connection", "close")) |
310 | break; | |
311 | } else if(!strcmp(req->ver, "HTTP/1.1")) { | |
18fb436d FT |
312 | if(!strcasecmp(req->method, "head")) { |
313 | writeresp(in, resp); | |
314 | fprintf(in, "\r\n"); | |
315 | } else if((hd = getheader(resp, "content-length")) != NULL) { | |
5fc1bf9f FT |
316 | writeresp(in, resp); |
317 | fprintf(in, "\r\n"); | |
5226f7c5 FT |
318 | dlen = atoo(hd); |
319 | if(passdata(out, in, dlen) != dlen) | |
5fc1bf9f FT |
320 | break; |
321 | } else if(!getheader(resp, "transfer-encoding")) { | |
322 | headappheader(resp, "Transfer-Encoding", "chunked"); | |
323 | writeresp(in, resp); | |
324 | fprintf(in, "\r\n"); | |
325 | if(passchunks(out, in)) | |
326 | break; | |
327 | } else { | |
328 | writeresp(in, resp); | |
329 | fprintf(in, "\r\n"); | |
330 | passdata(out, in, -1); | |
9d87a119 | 331 | break; |
5fc1bf9f FT |
332 | } |
333 | if(hasheader(req, "connection", "close") || hasheader(resp, "connection", "close")) | |
9d87a119 | 334 | break; |
5fc1bf9f FT |
335 | } else { |
336 | break; | |
9d87a119 | 337 | } |
5fc1bf9f FT |
338 | |
339 | fclose(out); | |
340 | out = NULL; | |
9d87a119 | 341 | freehthead(req); |
9d87a119 | 342 | freehthead(resp); |
5fc1bf9f | 343 | req = resp = NULL; |
66987955 FT |
344 | } |
345 | ||
5fc1bf9f FT |
346 | if(out != NULL) |
347 | fclose(out); | |
9d87a119 FT |
348 | if(req != NULL) |
349 | freehthead(req); | |
350 | if(resp != NULL) | |
351 | freehthead(resp); | |
5fc1bf9f | 352 | fclose(in); |
66987955 FT |
353 | } |
354 | ||
32e24c19 FT |
355 | static void plexwatch(struct muth *muth, va_list args) |
356 | { | |
357 | vavar(int, fd); | |
358 | char *buf; | |
359 | int ret; | |
360 | ||
361 | while(1) { | |
362 | block(fd, EV_READ, 0); | |
363 | buf = smalloc(65536); | |
364 | ret = recv(fd, buf, 65536, 0); | |
365 | if(ret < 0) { | |
366 | flog(LOG_WARNING, "received error on rootplex read channel: %s", strerror(errno)); | |
367 | exit(1); | |
368 | } else if(ret == 0) { | |
369 | exit(0); | |
370 | } | |
371 | /* Maybe I'd like to implement some protocol in this direction | |
372 | * some day... */ | |
373 | free(buf); | |
374 | } | |
375 | } | |
376 | ||
d341283f FT |
377 | static void initroot(void *uu) |
378 | { | |
379 | int fd; | |
380 | ||
381 | if(daemonize) { | |
382 | setsid(); | |
383 | chdir("/"); | |
384 | if((fd = open("/dev/null", O_RDWR)) >= 0) { | |
385 | dup2(fd, 0); | |
386 | dup2(fd, 1); | |
387 | dup2(fd, 2); | |
388 | close(fd); | |
389 | } | |
390 | } | |
391 | if(usesyslog) | |
392 | putenv("ASHD_USESYSLOG=1"); | |
393 | else | |
394 | unsetenv("ASHD_USESYSLOG"); | |
395 | } | |
396 | ||
8774c31b FT |
397 | static void usage(FILE *out) |
398 | { | |
43c58ba2 | 399 | fprintf(out, "usage: htparser [-hSf] [-u USER] [-r ROOT] [-p PIDFILE] PORTSPEC... -- ROOT [ARGS...]\n"); |
8774c31b | 400 | fprintf(out, "\twhere PORTSPEC is HANDLER[:PAR[=VAL][(,PAR[=VAL])...]] (try HANDLER:help)\n"); |
6ca53b2e | 401 | fprintf(out, "\tavailable handlers are `plain' and `ssl'.\n"); |
8774c31b FT |
402 | } |
403 | ||
404 | static void addport(char *spec) | |
405 | { | |
406 | char *nm, *p, *p2, *n; | |
407 | struct charvbuf pars, vals; | |
408 | ||
409 | bufinit(pars); | |
410 | bufinit(vals); | |
411 | if((p = strchr(spec, ':')) == NULL) { | |
412 | nm = spec; | |
413 | } else { | |
414 | nm = spec; | |
415 | *(p++) = 0; | |
416 | do { | |
417 | if((n = strchr(p, ',')) != NULL) | |
418 | *(n++) = 0; | |
419 | if((p2 = strchr(p, '=')) != NULL) | |
420 | *(p2++) = 0; | |
421 | if(!*p) { | |
422 | usage(stderr); | |
423 | exit(1); | |
424 | } | |
425 | bufadd(pars, p); | |
426 | if(p2) | |
427 | bufadd(vals, p2); | |
428 | else | |
429 | bufadd(vals, ""); | |
430 | } while((p = n) != NULL); | |
431 | } | |
432 | ||
433 | /* XXX: It would be nice to decentralize this, but, meh... */ | |
434 | if(!strcmp(nm, "plain")) { | |
435 | handleplain(pars.d, pars.b, vals.b); | |
6ca53b2e FT |
436 | #ifdef HAVE_GNUTLS |
437 | } else if(!strcmp(nm, "ssl")) { | |
438 | handlegnussl(pars.d, pars.b, vals.b); | |
439 | #endif | |
8774c31b FT |
440 | } else { |
441 | flog(LOG_ERR, "htparser: unknown port handler `%s'", nm); | |
442 | exit(1); | |
443 | } | |
444 | ||
445 | buffree(pars); | |
446 | buffree(vals); | |
447 | } | |
448 | ||
f0bbedf7 FT |
449 | int main(int argc, char **argv) |
450 | { | |
8774c31b FT |
451 | int c; |
452 | int i, s1; | |
f0cbd8d7 | 453 | char *root; |
43c58ba2 | 454 | FILE *pidout; |
f0cbd8d7 | 455 | struct passwd *pwent; |
f4cdf919 | 456 | |
d341283f | 457 | daemonize = usesyslog = 0; |
f0cbd8d7 FT |
458 | root = NULL; |
459 | pwent = NULL; | |
43c58ba2 | 460 | while((c = getopt(argc, argv, "+hSfu:r:p:")) >= 0) { |
8774c31b FT |
461 | switch(c) { |
462 | case 'h': | |
463 | usage(stdout); | |
464 | exit(0); | |
f0cbd8d7 FT |
465 | case 'f': |
466 | daemonize = 1; | |
467 | break; | |
468 | case 'S': | |
d341283f | 469 | usesyslog = 1; |
f0cbd8d7 FT |
470 | break; |
471 | case 'u': | |
472 | if((pwent = getpwnam(optarg)) == NULL) { | |
473 | flog(LOG_ERR, "could not find user %s", optarg); | |
474 | exit(1); | |
475 | } | |
476 | break; | |
477 | case 'r': | |
478 | root = optarg; | |
479 | break; | |
43c58ba2 FT |
480 | case 'p': |
481 | pidfile = optarg; | |
482 | break; | |
8774c31b FT |
483 | default: |
484 | usage(stderr); | |
485 | exit(1); | |
486 | } | |
487 | } | |
8774c31b FT |
488 | s1 = 0; |
489 | for(i = optind; i < argc; i++) { | |
490 | if(!strcmp(argv[i], "--")) | |
491 | break; | |
492 | s1 = 1; | |
493 | addport(argv[i]); | |
9d87a119 | 494 | } |
8774c31b FT |
495 | if(!s1 || (i == argc)) { |
496 | usage(stderr); | |
497 | exit(1); | |
f4cdf919 | 498 | } |
d341283f | 499 | if((plex = stdmkchild(argv + ++i, initroot, NULL)) < 0) { |
8774c31b FT |
500 | flog(LOG_ERR, "could not spawn root multiplexer: %s", strerror(errno)); |
501 | return(1); | |
f4cdf919 | 502 | } |
32e24c19 | 503 | mustart(plexwatch, plex); |
43c58ba2 FT |
504 | pidout = NULL; |
505 | if(pidfile != NULL) { | |
506 | if((pidout = fopen(pidfile, "w")) == NULL) { | |
507 | flog(LOG_ERR, "could not open %s for writing: %s", pidfile, strerror(errno)); | |
508 | return(1); | |
509 | } | |
510 | } | |
d341283f | 511 | if(usesyslog) |
f0cbd8d7 FT |
512 | opensyslog(); |
513 | if(root) { | |
0370bd82 | 514 | if(chdir(root) || chroot(root)) { |
f0cbd8d7 FT |
515 | flog(LOG_ERR, "could not chroot to %s: %s", root, strerror(errno)); |
516 | exit(1); | |
517 | } | |
518 | } | |
519 | if(pwent) { | |
520 | if(setgid(pwent->pw_gid)) { | |
521 | flog(LOG_ERR, "could not switch group to %i: %s", (int)pwent->pw_gid, strerror(errno)); | |
522 | exit(1); | |
523 | } | |
524 | if(setuid(pwent->pw_uid)) { | |
525 | flog(LOG_ERR, "could not switch user to %i: %s", (int)pwent->pw_uid, strerror(errno)); | |
526 | exit(1); | |
527 | } | |
528 | } | |
15fa3fe8 | 529 | signal(SIGPIPE, SIG_IGN); |
f0cbd8d7 FT |
530 | if(daemonize) { |
531 | daemon(0, 0); | |
532 | } | |
ee036f74 | 533 | if(pidout != NULL) { |
43c58ba2 | 534 | fprintf(pidout, "%i\n", getpid()); |
ee036f74 FT |
535 | fclose(pidout); |
536 | } | |
f4cdf919 FT |
537 | ioloop(); |
538 | return(0); | |
f0bbedf7 | 539 | } |