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> | |
f4cdf919 FT |
22 | #include <string.h> |
23 | #include <sys/select.h> | |
24 | #include <sys/socket.h> | |
25 | #include <netinet/in.h> | |
9d87a119 | 26 | #include <arpa/inet.h> |
f4cdf919 | 27 | #include <errno.h> |
9d87a119 | 28 | #include <time.h> |
f0bbedf7 FT |
29 | |
30 | #ifdef HAVE_CONFIG_H | |
31 | #include <config.h> | |
32 | #endif | |
33 | #include <utils.h> | |
f4cdf919 FT |
34 | #include <mt.h> |
35 | #include <log.h> | |
66987955 | 36 | #include <req.h> |
9d87a119 | 37 | #include <proc.h> |
f4cdf919 FT |
38 | |
39 | #define EV_READ 1 | |
40 | #define EV_WRITE 2 | |
41 | ||
42 | struct blocker { | |
43 | struct blocker *n, *p; | |
44 | int fd; | |
45 | int ev; | |
9d87a119 | 46 | time_t to; |
f4cdf919 FT |
47 | struct muth *th; |
48 | }; | |
49 | ||
50 | static struct blocker *blockers; | |
9d87a119 | 51 | int plex; |
f4cdf919 | 52 | |
9d87a119 | 53 | static int block(int fd, int ev, time_t to) |
f4cdf919 FT |
54 | { |
55 | struct blocker *bl; | |
56 | int rv; | |
57 | ||
58 | omalloc(bl); | |
59 | bl->fd = fd; | |
60 | bl->ev = ev; | |
9d87a119 FT |
61 | if(to > 0) |
62 | bl->to = time(NULL) + to; | |
f4cdf919 FT |
63 | bl->th = current; |
64 | bl->n = blockers; | |
65 | if(blockers) | |
66 | blockers->p = bl; | |
67 | blockers = bl; | |
68 | rv = yield(); | |
69 | if(bl->n) | |
70 | bl->n->p = bl->p; | |
71 | if(bl->p) | |
72 | bl->p->n = bl->n; | |
73 | if(bl == blockers) | |
74 | blockers = bl->n; | |
75 | return(rv); | |
76 | } | |
77 | ||
78 | static int listensock4(int port) | |
79 | { | |
80 | struct sockaddr_in name; | |
81 | int fd; | |
82 | int valbuf; | |
83 | ||
84 | memset(&name, 0, sizeof(name)); | |
85 | name.sin_family = AF_INET; | |
86 | name.sin_port = htons(port); | |
87 | if((fd = socket(PF_INET, SOCK_STREAM, 0)) < 0) | |
88 | return(-1); | |
89 | valbuf = 1; | |
90 | setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &valbuf, sizeof(valbuf)); | |
91 | if(bind(fd, (struct sockaddr *)&name, sizeof(name))) { | |
92 | close(fd); | |
93 | return(-1); | |
94 | } | |
95 | if(listen(fd, 16) < 0) { | |
96 | close(fd); | |
97 | return(-1); | |
98 | } | |
99 | return(fd); | |
100 | } | |
101 | ||
102 | static int listensock6(int port) | |
103 | { | |
104 | struct sockaddr_in6 name; | |
105 | int fd; | |
106 | int valbuf; | |
107 | ||
108 | memset(&name, 0, sizeof(name)); | |
109 | name.sin6_family = AF_INET6; | |
110 | name.sin6_port = htons(port); | |
111 | if((fd = socket(PF_INET6, SOCK_STREAM, 0)) < 0) | |
112 | return(-1); | |
113 | valbuf = 1; | |
114 | setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &valbuf, sizeof(valbuf)); | |
115 | if(bind(fd, (struct sockaddr *)&name, sizeof(name))) { | |
116 | close(fd); | |
117 | return(-1); | |
118 | } | |
119 | if(listen(fd, 16) < 0) { | |
120 | close(fd); | |
121 | return(-1); | |
122 | } | |
123 | return(fd); | |
124 | } | |
125 | ||
c9955b14 | 126 | static size_t readhead(int fd, struct charbuf *buf) |
66987955 | 127 | { |
66987955 | 128 | int nl; |
c9955b14 | 129 | size_t off; |
66987955 | 130 | |
c9955b14 FT |
131 | int get1(void) |
132 | { | |
133 | int ret; | |
134 | ||
135 | while(!(off < buf->d)) { | |
136 | sizebuf(*buf, buf->d + 1024); | |
137 | ret = recv(fd, buf->b + buf->d, buf->s - buf->d, MSG_DONTWAIT); | |
138 | if(ret <= 0) { | |
139 | if((ret < 0) && (errno == EAGAIN)) { | |
9d87a119 FT |
140 | if(block(fd, EV_READ, 60) <= 0) |
141 | return(-1); | |
c9955b14 FT |
142 | continue; |
143 | } | |
144 | return(-1); | |
66987955 | 145 | } |
c9955b14 | 146 | buf->d += ret; |
66987955 | 147 | } |
c9955b14 FT |
148 | return(buf->b[off++]); |
149 | } | |
150 | ||
151 | nl = 0; | |
152 | off = 0; | |
153 | while(1) { | |
154 | switch(get1()) { | |
155 | case '\n': | |
66987955 | 156 | if(nl) |
c9955b14 | 157 | return(off); |
66987955 | 158 | nl = 1; |
c9955b14 FT |
159 | break; |
160 | case '\r': | |
161 | break; | |
162 | case -1: | |
163 | return(-1); | |
164 | default: | |
66987955 | 165 | nl = 0; |
c9955b14 | 166 | break; |
66987955 FT |
167 | } |
168 | } | |
66987955 FT |
169 | } |
170 | ||
171 | #define SKIPNL(ptr) ({ \ | |
172 | int __buf__; \ | |
173 | if(*(ptr) == '\r') \ | |
174 | *((ptr)++) = 0; \ | |
175 | if(*(ptr) != '\n') { \ | |
176 | __buf__ = 0; \ | |
177 | } else { \ | |
178 | *((ptr)++) = 0; \ | |
179 | __buf__ = 1; \ | |
180 | } \ | |
181 | __buf__;}) | |
9d87a119 | 182 | static struct hthead *parserawreq(char *buf) |
66987955 FT |
183 | { |
184 | char *p, *p2, *nl; | |
185 | char *method, *url, *ver; | |
9d87a119 | 186 | struct hthead *req; |
66987955 FT |
187 | |
188 | if((nl = strchr(buf, '\n')) == NULL) | |
189 | return(NULL); | |
190 | if(((p = strchr(buf, ' ')) == NULL) || (p > nl)) | |
191 | return(NULL); | |
192 | method = buf; | |
193 | *(p++) = 0; | |
194 | if(((p2 = strchr(p, ' ')) == NULL) || (p2 > nl)) | |
195 | return(NULL); | |
196 | url = p; | |
197 | p = p2; | |
198 | *(p++) = 0; | |
199 | if(strncmp(p, "HTTP/", 5)) | |
200 | return(NULL); | |
201 | ver = (p += 5); | |
202 | for(; ((*p >= '0') && (*p <= '9')) || (*p == '.'); p++); | |
203 | if(!SKIPNL(p)) | |
204 | return(NULL); | |
205 | ||
206 | req = mkreq(method, url, ver); | |
207 | while(1) { | |
208 | if(SKIPNL(p)) { | |
209 | if(*p) | |
c9955b14 | 210 | goto fail; |
66987955 FT |
211 | break; |
212 | } | |
213 | if((nl = strchr(p, '\n')) == NULL) | |
c9955b14 | 214 | goto fail; |
66987955 | 215 | if(((p2 = strchr(p, ':')) == NULL) || (p2 > nl)) |
c9955b14 | 216 | goto fail; |
66987955 FT |
217 | *(p2++) = 0; |
218 | for(; (*p2 == ' ') || (*p2 == '\t'); p2++); | |
219 | for(nl = p2; (*nl != '\r') && (*nl != '\n'); nl++); | |
220 | if(!SKIPNL(nl)) | |
c9955b14 | 221 | goto fail; |
9d87a119 FT |
222 | if(strncasecmp(p, "x-ash-", 6)) |
223 | headappheader(req, p, p2); | |
66987955 FT |
224 | p = nl; |
225 | } | |
226 | return(req); | |
c9955b14 FT |
227 | |
228 | fail: | |
9d87a119 | 229 | freehthead(req); |
c9955b14 | 230 | return(NULL); |
66987955 FT |
231 | } |
232 | ||
9d87a119 FT |
233 | static struct hthead *parserawresp(char *buf) |
234 | { | |
235 | char *p, *p2, *nl; | |
236 | char *msg, *ver; | |
237 | int code; | |
238 | struct hthead *resp; | |
239 | ||
240 | if((nl = strchr(buf, '\n')) == NULL) | |
241 | return(NULL); | |
242 | p = strchr(buf, '\r'); | |
243 | if((p != NULL) && (p < nl)) | |
244 | nl = p; | |
245 | if(strncmp(buf, "HTTP/", 5)) | |
246 | return(NULL); | |
247 | ver = p = buf + 5; | |
248 | for(; ((*p >= '0') && (*p <= '9')) || (*p == '.'); p++); | |
249 | if(*p != ' ') | |
250 | return(NULL); | |
251 | *(p++) = 0; | |
252 | if(((p2 = strchr(p, ' ')) == NULL) || (p2 > nl)) | |
253 | return(NULL); | |
254 | *(p2++) = 0; | |
255 | code = atoi(p); | |
256 | if((code < 100) || (code >= 600)) | |
257 | return(NULL); | |
258 | if(p2 >= nl) | |
259 | return(NULL); | |
260 | msg = p2; | |
261 | p = nl; | |
262 | if(!SKIPNL(p)) | |
263 | return(NULL); | |
264 | ||
265 | resp = mkresp(code, msg, ver); | |
266 | while(1) { | |
267 | if(SKIPNL(p)) { | |
268 | if(*p) | |
269 | goto fail; | |
270 | break; | |
271 | } | |
272 | if((nl = strchr(p, '\n')) == NULL) | |
273 | goto fail; | |
274 | if(((p2 = strchr(p, ':')) == NULL) || (p2 > nl)) | |
275 | goto fail; | |
276 | *(p2++) = 0; | |
277 | for(; (*p2 == ' ') || (*p2 == '\t'); p2++); | |
278 | for(nl = p2; (*nl != '\r') && (*nl != '\n'); nl++); | |
279 | if(!SKIPNL(nl)) | |
280 | goto fail; | |
281 | headappheader(resp, p, p2); | |
282 | p = nl; | |
283 | } | |
284 | return(resp); | |
285 | ||
286 | fail: | |
287 | freehthead(resp); | |
288 | return(NULL); | |
289 | } | |
290 | ||
291 | static off_t passdata(int src, int dst, struct charbuf *buf, off_t max) | |
292 | { | |
293 | size_t dataoff, smax; | |
294 | off_t sent; | |
295 | int eof, ret; | |
296 | ||
297 | sent = 0; | |
298 | eof = 0; | |
299 | while(!eof || (buf->d > 0)) { | |
300 | if(!eof && (buf->d < buf->s) && ((max < 0) || (sent + buf->d < max))) { | |
301 | while(1) { | |
302 | ret = recv(src, buf->b + buf->d, buf->s - buf->d, MSG_DONTWAIT); | |
303 | if((ret < 0) && (errno == EAGAIN)) { | |
304 | } else if(ret < 0) { | |
305 | return(-1); | |
306 | } else if(ret == 0) { | |
307 | eof = 1; | |
308 | break; | |
309 | } else { | |
310 | buf->d += ret; | |
311 | break; | |
312 | } | |
313 | if(buf->d > 0) | |
314 | break; | |
315 | if(block(src, EV_READ, 0) <= 0) | |
316 | return(-1); | |
317 | } | |
318 | } | |
319 | for(dataoff = 0; (dataoff < buf->d) && ((max < 0) || (sent < max));) { | |
320 | if(block(dst, EV_WRITE, 120) <= 0) | |
321 | return(-1); | |
322 | smax = buf->d - dataoff; | |
323 | if(sent + smax > max) | |
324 | smax = max - sent; | |
325 | ret = send(dst, buf->b + dataoff, smax, MSG_NOSIGNAL | MSG_DONTWAIT); | |
326 | if(ret < 0) | |
327 | return(-1); | |
328 | dataoff += ret; | |
329 | sent += ret; | |
330 | } | |
331 | bufeat(*buf, dataoff); | |
332 | } | |
333 | return(sent); | |
334 | } | |
335 | ||
66987955 FT |
336 | static void serve(struct muth *muth, va_list args) |
337 | { | |
338 | vavar(int, fd); | |
9d87a119 FT |
339 | vavar(struct sockaddr_storage, name); |
340 | int cfd; | |
341 | char old; | |
342 | char *hd; | |
343 | struct charbuf inbuf, outbuf; | |
344 | struct hthead *req, *resp; | |
a0327573 | 345 | off_t dlen, sent; |
c9955b14 | 346 | size_t headoff; |
9d87a119 | 347 | char nmbuf[256]; |
66987955 | 348 | |
9d87a119 FT |
349 | bufinit(inbuf); |
350 | bufinit(outbuf); | |
351 | cfd = -1; | |
352 | req = NULL; | |
66987955 | 353 | while(1) { |
9d87a119 FT |
354 | /* |
355 | * First, find and decode the header: | |
356 | */ | |
357 | if((headoff = readhead(fd, &inbuf)) < 0) | |
358 | goto out; | |
359 | if(headoff > 65536) { | |
360 | /* We cannot handle arbitrarily large headers, as they | |
361 | * need to fit within a single Unix datagram. This is | |
362 | * probably a safe limit, and larger packets than this are | |
363 | * most likely erroneous (or malicious) anyway. */ | |
364 | goto out; | |
365 | } | |
366 | old = inbuf.b[headoff]; | |
367 | inbuf.b[headoff] = 0; | |
368 | if((req = parserawreq(inbuf.b)) == NULL) | |
66987955 | 369 | goto out; |
9d87a119 FT |
370 | inbuf.b[headoff] = old; |
371 | bufeat(inbuf, headoff); | |
372 | ||
373 | /* | |
374 | * Add metainformation and then send the request to the root | |
375 | * multiplexer: | |
376 | */ | |
377 | if(name.ss_family == AF_INET) { | |
378 | headappheader(req, "X-Ash-Address", inet_ntop(AF_INET, &((struct sockaddr_in *)&name)->sin_addr, nmbuf, sizeof(nmbuf))); | |
379 | headappheader(req, "X-Ash-Port", sprintf3("%i", ntohs(((struct sockaddr_in *)&name)->sin_port))); | |
380 | } else if(name.ss_family == AF_INET6) { | |
381 | headappheader(req, "X-Ash-Address", inet_ntop(AF_INET6, &((struct sockaddr_in6 *)&name)->sin6_addr, nmbuf, sizeof(nmbuf))); | |
382 | headappheader(req, "X-Ash-Port", sprintf3("%i", ntohs(((struct sockaddr_in6 *)&name)->sin6_port))); | |
383 | } | |
384 | cfd = sendreq(plex, req); | |
a0327573 FT |
385 | |
386 | /* | |
387 | * If there is message data, pass it: | |
388 | */ | |
389 | if((hd = getheader(req, "content-length")) != NULL) { | |
390 | dlen = atoo(hd); | |
391 | if(dlen > 0) | |
392 | passdata(fd, cfd, &inbuf, dlen); | |
393 | } | |
9d87a119 FT |
394 | |
395 | /* | |
396 | * Find and decode the response header: | |
397 | */ | |
398 | outbuf.d = 0; | |
399 | headoff = readhead(cfd, &outbuf); | |
400 | hd = memcpy(smalloc(headoff + 1), outbuf.b, headoff); | |
401 | hd[headoff] = 0; | |
402 | if((resp = parserawresp(hd)) == NULL) | |
66987955 | 403 | goto out; |
9d87a119 FT |
404 | |
405 | /* | |
406 | * Pass the actual output: | |
407 | */ | |
408 | sizebuf(outbuf, 65536); | |
409 | sent = passdata(cfd, fd, &outbuf, -1); | |
410 | sent -= headoff; | |
411 | ||
412 | /* | |
413 | * Check for connection expiry | |
414 | */ | |
415 | if(strcasecmp(req->method, "head")) { | |
416 | if((hd = getheader(resp, "content-length")) != NULL) { | |
417 | if(sent != atoo(hd)) { | |
418 | /* Exit because of error */ | |
419 | goto out; | |
420 | } | |
421 | } else { | |
422 | if(((hd = getheader(resp, "transfer-encoding")) == NULL) || !strcasecmp(hd, "identity")) | |
423 | break; | |
424 | } | |
425 | if(((hd = getheader(req, "connection")) != NULL) && !strcasecmp(hd, "close")) | |
426 | break; | |
427 | if(((hd = getheader(resp, "connection")) != NULL) && !strcasecmp(hd, "close")) | |
428 | break; | |
429 | } | |
430 | ||
431 | close(cfd); | |
432 | cfd = -1; | |
433 | freehthead(req); | |
434 | req = NULL; | |
435 | freehthead(resp); | |
436 | resp = NULL; | |
66987955 FT |
437 | } |
438 | ||
439 | out: | |
9d87a119 FT |
440 | if(cfd >= 0) |
441 | close(cfd); | |
442 | if(req != NULL) | |
443 | freehthead(req); | |
444 | if(resp != NULL) | |
445 | freehthead(resp); | |
446 | buffree(inbuf); | |
447 | buffree(outbuf); | |
66987955 FT |
448 | close(fd); |
449 | } | |
450 | ||
f4cdf919 FT |
451 | static void listenloop(struct muth *muth, va_list args) |
452 | { | |
453 | vavar(int, ss); | |
454 | int ns; | |
455 | struct sockaddr_storage name; | |
456 | socklen_t namelen; | |
457 | ||
458 | while(1) { | |
459 | namelen = sizeof(name); | |
9d87a119 | 460 | block(ss, EV_READ, 0); |
f4cdf919 | 461 | ns = accept(ss, (struct sockaddr *)&name, &namelen); |
66987955 FT |
462 | if(ns < 0) { |
463 | flog(LOG_ERR, "accept: %s", strerror(errno)); | |
464 | goto out; | |
465 | } | |
9d87a119 | 466 | mustart(serve, ns, name); |
f4cdf919 | 467 | } |
66987955 FT |
468 | |
469 | out: | |
470 | close(ss); | |
f4cdf919 FT |
471 | } |
472 | ||
473 | static void ioloop(void) | |
474 | { | |
475 | int ret; | |
476 | fd_set rfds, wfds, efds; | |
477 | struct blocker *bl, *nbl; | |
9d87a119 FT |
478 | struct timeval toval; |
479 | time_t now, timeout; | |
f4cdf919 FT |
480 | int maxfd; |
481 | int ev; | |
482 | ||
66987955 | 483 | while(blockers != NULL) { |
f4cdf919 FT |
484 | FD_ZERO(&rfds); |
485 | FD_ZERO(&wfds); | |
486 | FD_ZERO(&efds); | |
487 | maxfd = 0; | |
9d87a119 FT |
488 | now = time(NULL); |
489 | timeout = 0; | |
f4cdf919 FT |
490 | for(bl = blockers; bl; bl = bl->n) { |
491 | if(bl->ev & EV_READ) | |
492 | FD_SET(bl->fd, &rfds); | |
493 | if(bl->ev & EV_WRITE) | |
494 | FD_SET(bl->fd, &wfds); | |
495 | FD_SET(bl->fd, &efds); | |
496 | if(bl->fd > maxfd) | |
497 | maxfd = bl->fd; | |
9d87a119 FT |
498 | if((bl->to != 0) && ((timeout == 0) || (timeout > bl->to))) |
499 | timeout = bl->to; | |
f4cdf919 | 500 | } |
9d87a119 FT |
501 | toval.tv_sec = timeout - now; |
502 | toval.tv_usec = 0; | |
503 | ret = select(maxfd + 1, &rfds, &wfds, &efds, timeout?(&toval):NULL); | |
f4cdf919 FT |
504 | if(ret < 0) { |
505 | if(errno != EINTR) { | |
506 | flog(LOG_CRIT, "ioloop: select errored out: %s", strerror(errno)); | |
507 | /* To avoid CPU hogging in case it's bad, which it | |
508 | * probably is. */ | |
509 | sleep(1); | |
510 | } | |
511 | } | |
9d87a119 | 512 | now = time(NULL); |
f4cdf919 FT |
513 | for(bl = blockers; bl; bl = nbl) { |
514 | nbl = bl->n; | |
515 | ev = 0; | |
516 | if(FD_ISSET(bl->fd, &rfds)) | |
517 | ev |= EV_READ; | |
518 | if(FD_ISSET(bl->fd, &wfds)) | |
519 | ev |= EV_WRITE; | |
520 | if(FD_ISSET(bl->fd, &efds)) | |
521 | ev = -1; | |
66987955 FT |
522 | if(ev != 0) |
523 | resume(bl->th, ev); | |
9d87a119 FT |
524 | else if((bl->to != 0) && (bl->to <= now)) |
525 | resume(bl->th, 0); | |
f4cdf919 FT |
526 | } |
527 | } | |
528 | } | |
f0bbedf7 FT |
529 | |
530 | int main(int argc, char **argv) | |
531 | { | |
f4cdf919 FT |
532 | int fd; |
533 | ||
9d87a119 FT |
534 | if(argc < 2) { |
535 | fprintf(stderr, "usage: htparser ROOT [ARGS...]\n"); | |
536 | exit(1); | |
537 | } | |
538 | if((plex = stdmkchild(argv + 1)) < 0) { | |
539 | flog(LOG_ERR, "could not spawn root multiplexer: %s", strerror(errno)); | |
540 | return(1); | |
541 | } | |
f4cdf919 FT |
542 | if((fd = listensock6(8080)) < 0) { |
543 | flog(LOG_ERR, "could not listen on IPv6: %s", strerror(errno)); | |
544 | return(1); | |
545 | } | |
546 | mustart(listenloop, fd); | |
547 | if((fd = listensock4(8080)) < 0) { | |
548 | if(errno != EADDRINUSE) { | |
549 | flog(LOG_ERR, "could not listen on IPv4: %s", strerror(errno)); | |
550 | return(1); | |
551 | } | |
552 | } else { | |
553 | mustart(listenloop, fd); | |
554 | } | |
555 | ioloop(); | |
556 | return(0); | |
f0bbedf7 | 557 | } |