Mark _printflike_ things so we get format warnings.
[darkstat] / http.c
1 /* darkstat 3
2 * copyright (c) 2001-2012 Emil Mikulic.
3 *
4 * http.c: embedded webserver.
5 * This borrows a lot of code from darkhttpd.
6 *
7 * You may use, modify and redistribute this file under the terms of the
8 * GNU General Public License version 2. (see COPYING.GPL)
9 */
10
11 #include "cdefs.h"
12 #include "config.h"
13 #include "conv.h"
14 #include "err.h"
15 #include "graph_db.h"
16 #include "hosts_db.h"
17 #include "http.h"
18 #include "now.h"
19 #include "queue.h"
20 #include "str.h"
21
22 #include <sys/uio.h>
23 #include <sys/socket.h>
24 #include <arpa/inet.h>
25 #include <netinet/in.h>
26 #include <netdb.h>
27 #include <assert.h>
28 #include <ctype.h>
29 #include <errno.h>
30 #include <fcntl.h>
31 #include <signal.h>
32 #include <stdarg.h>
33 #include <stdio.h>
34 #include <stdlib.h>
35 #include <string.h>
36 #include <time.h>
37 #include <unistd.h>
38 #include <zlib.h>
39
40 static const char mime_type_xml[] = "text/xml";
41 static const char mime_type_html[] = "text/html; charset=us-ascii";
42 static const char mime_type_css[] = "text/css";
43 static const char mime_type_js[] = "text/javascript";
44 static const char encoding_identity[] = "identity";
45 static const char encoding_gzip[] = "gzip";
46
47 static const char server[] = PACKAGE_NAME "/" PACKAGE_VERSION;
48 static int idletime = 60;
49 #define MAX_REQUEST_LENGTH 4000
50
51 static int *insocks = NULL;
52 static unsigned int insock_num = 0;
53
54 struct connection {
55 LIST_ENTRY(connection) entries;
56
57 int socket;
58 struct sockaddr_storage client;
59 time_t last_active_mono;
60 enum {
61 RECV_REQUEST, /* receiving request */
62 SEND_HEADER_AND_REPLY, /* try to send header+reply together */
63 SEND_HEADER, /* sending generated header */
64 SEND_REPLY, /* sending reply */
65 DONE /* conn closed, need to remove from queue */
66 } state;
67
68 /* char request[request_length+1] is null-terminated */
69 char *request;
70 size_t request_length;
71 int accept_gzip;
72
73 /* request fields */
74 char *method, *uri, *query; /* query can be NULL */
75
76 char *header;
77 const char *mime_type, *encoding, *header_extra;
78 size_t header_length, header_sent;
79 int header_dont_free, header_only, http_code;
80
81 char *reply;
82 int reply_dont_free;
83 size_t reply_length, reply_sent;
84
85 unsigned int total_sent; /* header + body = total, for logging */
86 };
87
88 static LIST_HEAD(conn_list_head, connection) connlist =
89 LIST_HEAD_INITIALIZER(conn_list_head);
90
91 struct bindaddr_entry {
92 STAILQ_ENTRY(bindaddr_entry) entries;
93 const char *s;
94 };
95 static STAILQ_HEAD(bindaddrs_head, bindaddr_entry) bindaddrs =
96 STAILQ_HEAD_INITIALIZER(bindaddrs);
97
98 /* ---------------------------------------------------------------------------
99 * Decode URL by converting %XX (where XX are hexadecimal digits) to the
100 * character it represents. Don't forget to free the return value.
101 */
102 static char *urldecode(const char *url)
103 {
104 size_t i, len = strlen(url);
105 char *out = xmalloc(len+1);
106 int pos;
107
108 for (i=0, pos=0; i<len; i++)
109 {
110 if (url[i] == '%' && i+2 < len &&
111 isxdigit(url[i+1]) && isxdigit(url[i+2]))
112 {
113 /* decode %XX */
114 #define HEX_TO_DIGIT(hex) ( \
115 ((hex) >= 'A' && (hex) <= 'F') ? ((hex)-'A'+10): \
116 ((hex) >= 'a' && (hex) <= 'f') ? ((hex)-'a'+10): \
117 ((hex)-'0') )
118
119 out[pos++] = HEX_TO_DIGIT(url[i+1]) * 16 +
120 HEX_TO_DIGIT(url[i+2]);
121 i += 2;
122
123 #undef HEX_TO_DIGIT
124 }
125 else
126 {
127 /* straight copy */
128 out[pos++] = url[i];
129 }
130 }
131 out[pos] = 0;
132 #if 0
133 /* don't really need to realloc here - it's probably a performance hit */
134 out = xrealloc(out, strlen(out)+1); /* dealloc what we don't need */
135 #endif
136 return (out);
137 }
138
139
140
141 /* ---------------------------------------------------------------------------
142 * Consolidate slashes in-place by shifting parts of the string over repeated
143 * slashes.
144 */
145 static void consolidate_slashes(char *s)
146 {
147 size_t left = 0, right = 0;
148 int saw_slash = 0;
149
150 assert(s != NULL);
151
152 while (s[right] != '\0')
153 {
154 if (saw_slash)
155 {
156 if (s[right] == '/') right++;
157 else
158 {
159 saw_slash = 0;
160 s[left++] = s[right++];
161 }
162 }
163 else
164 {
165 if (s[right] == '/') saw_slash++;
166 s[left++] = s[right++];
167 }
168 }
169 s[left] = '\0';
170 }
171
172
173
174 /* ---------------------------------------------------------------------------
175 * Resolve /./ and /../ in a URI, returing a new, safe URI, or NULL if the URI
176 * is invalid/unsafe. Returned buffer needs to be deallocated.
177 */
178 static char *make_safe_uri(char *uri)
179 {
180 char **elem, *out;
181 unsigned int slashes = 0, elements = 0;
182 size_t urilen, i, j, pos;
183
184 assert(uri != NULL);
185 if (uri[0] != '/')
186 return (NULL);
187 consolidate_slashes(uri);
188 urilen = strlen(uri);
189
190 /* count the slashes */
191 for (i=0, slashes=0; i<urilen; i++)
192 if (uri[i] == '/') slashes++;
193
194 /* make an array for the URI elements */
195 elem = xmalloc(sizeof(*elem) * slashes);
196 for (i=0; i<slashes; i++)
197 elem[i] = (NULL);
198
199 /* split by slashes and build elem[] array */
200 for (i=1; i<urilen;)
201 {
202 /* look for the next slash */
203 for (j=i; j<urilen && uri[j] != '/'; j++)
204 ;
205
206 /* process uri[i,j) */
207 if ((j == i+1) && (uri[i] == '.'))
208 /* "." */;
209 else if ((j == i+2) && (uri[i] == '.') && (uri[i+1] == '.'))
210 {
211 /* ".." */
212 if (elements == 0)
213 {
214 /*
215 * Unsafe string so free elem[]. All its elements are free
216 * at this point.
217 */
218 free(elem);
219 return (NULL);
220 }
221 else
222 {
223 elements--;
224 free(elem[elements]);
225 }
226 }
227 else elem[elements++] = split_string(uri, i, j);
228
229 i = j + 1; /* uri[j] is a slash - move along one */
230 }
231
232 /* reassemble */
233 out = xmalloc(urilen+1); /* it won't expand */
234 pos = 0;
235 for (i=0; i<elements; i++)
236 {
237 size_t delta = strlen(elem[i]);
238
239 assert(pos <= urilen);
240 out[pos++] = '/';
241
242 assert(pos+delta <= urilen);
243 memcpy(out+pos, elem[i], delta);
244 free(elem[i]);
245 pos += delta;
246 }
247 free(elem);
248
249 if ((elements == 0) || (uri[urilen-1] == '/')) out[pos++] = '/';
250 assert(pos <= urilen);
251 out[pos] = '\0';
252
253 #if 0
254 /* don't really need to do this and it's probably a performance hit: */
255 /* shorten buffer if necessary */
256 if (pos != urilen) out = xrealloc(out, strlen(out)+1);
257 #endif
258 return (out);
259 }
260
261 /* ---------------------------------------------------------------------------
262 * Allocate and initialize an empty connection.
263 */
264 static struct connection *new_connection(void)
265 {
266 struct connection *conn = xmalloc(sizeof(*conn));
267
268 conn->socket = -1;
269 memset(&conn->client, 0, sizeof(conn->client));
270 conn->last_active_mono = now_mono();
271 conn->request = NULL;
272 conn->request_length = 0;
273 conn->accept_gzip = 0;
274 conn->method = NULL;
275 conn->uri = NULL;
276 conn->query = NULL;
277 conn->header = NULL;
278 conn->mime_type = NULL;
279 conn->encoding = NULL;
280 conn->header_extra = "";
281 conn->header_length = 0;
282 conn->header_sent = 0;
283 conn->header_dont_free = 0;
284 conn->header_only = 0;
285 conn->http_code = 0;
286 conn->reply = NULL;
287 conn->reply_dont_free = 0;
288 conn->reply_length = 0;
289 conn->reply_sent = 0;
290 conn->total_sent = 0;
291
292 /* Make it harmless so it gets garbage-collected if it should, for some
293 * reason, fail to be correctly filled out.
294 */
295 conn->state = DONE;
296
297 return (conn);
298 }
299
300
301
302 /* ---------------------------------------------------------------------------
303 * Accept a connection from sockin and add it to the connection queue.
304 */
305 static void accept_connection(const int sockin)
306 {
307 struct sockaddr_storage addrin;
308 socklen_t sin_size;
309 struct connection *conn;
310 char ipaddr[INET6_ADDRSTRLEN], portstr[12];
311 int sock;
312
313 sin_size = (socklen_t)sizeof(addrin);
314 sock = accept(sockin, (struct sockaddr *)&addrin, &sin_size);
315 if (sock == -1)
316 {
317 if (errno == ECONNABORTED || errno == EINTR)
318 {
319 verbosef("accept() failed: %s", strerror(errno));
320 return;
321 }
322 /* else */ err(1, "accept()");
323 }
324
325 fd_set_nonblock(sock);
326
327 /* allocate and initialise struct connection */
328 conn = new_connection();
329 conn->socket = sock;
330 conn->state = RECV_REQUEST;
331 memcpy(&conn->client, &addrin, sizeof(conn->client));
332 LIST_INSERT_HEAD(&connlist, conn, entries);
333
334 getnameinfo((struct sockaddr *) &addrin, sin_size,
335 ipaddr, sizeof(ipaddr), portstr, sizeof(portstr),
336 NI_NUMERICHOST | NI_NUMERICSERV);
337 verbosef("accepted connection from %s:%s", ipaddr, portstr);
338 }
339
340
341
342 /* ---------------------------------------------------------------------------
343 * Log a connection, then cleanly deallocate its internals.
344 */
345 static void free_connection(struct connection *conn)
346 {
347 dverbosef("free_connection(%d)", conn->socket);
348 if (conn->socket != -1)
349 close(conn->socket);
350 free(conn->request);
351 free(conn->method);
352 free(conn->uri);
353 free(conn->query);
354 if (!conn->header_dont_free)
355 free(conn->header);
356 if (!conn->reply_dont_free)
357 free(conn->reply);
358 }
359
360
361
362 /* ---------------------------------------------------------------------------
363 * Format [when] as an RFC1123 date, stored in the specified buffer. The same
364 * buffer is returned for convenience.
365 */
366 #define DATE_LEN 30 /* strlen("Fri, 28 Feb 2003 00:02:08 GMT")+1 */
367 static char *rfc1123_date(char *dest, time_t when) {
368 if (strftime(dest, DATE_LEN,
369 "%a, %d %b %Y %H:%M:%S %Z", gmtime(&when) ) == 0)
370 errx(1, "strftime() failed [%s]", dest);
371 return dest;
372 }
373
374 static void generate_header(struct connection *conn,
375 const int code, const char *text)
376 {
377 char date[DATE_LEN];
378
379 assert(conn->header == NULL);
380 assert(conn->mime_type != NULL);
381 if (conn->encoding == NULL)
382 conn->encoding = encoding_identity;
383
384 verbosef("http: %d %s (%s: %zu bytes)", code, text,
385 conn->encoding, conn->reply_length);
386 conn->header_length = xasprintf(&(conn->header),
387 "HTTP/1.1 %d %s\r\n"
388 "Date: %s\r\n"
389 "Server: %s\r\n"
390 "Vary: Accept-Encoding\r\n"
391 "Content-Type: %s\r\n"
392 "Content-Length: %d\r\n"
393 "Content-Encoding: %s\r\n"
394 "X-Robots-Tag: noindex, noarchive\r\n"
395 "%s"
396 "\r\n"
397 ,
398 code, text,
399 rfc1123_date(date, now_real()), server,
400 conn->mime_type, conn->reply_length, conn->encoding,
401 conn->header_extra);
402 conn->http_code = code;
403 }
404
405
406
407 /* ---------------------------------------------------------------------------
408 * A default reply for any (erroneous) occasion.
409 */
410 static void default_reply(struct connection *conn,
411 const int errcode, const char *errname, const char *format, ...)
412 _printflike_(4, 5);
413 static void default_reply(struct connection *conn,
414 const int errcode, const char *errname, const char *format, ...)
415 {
416 char *reason;
417 va_list va;
418
419 va_start(va, format);
420 xvasprintf(&reason, format, va);
421 va_end(va);
422
423 conn->reply_length = xasprintf(&(conn->reply),
424 "<html><head><title>%d %s</title></head><body>\n"
425 "<h1>%s</h1>\n" /* errname */
426 "%s\n" /* reason */
427 "<hr>\n"
428 "Generated by %s"
429 "</body></html>\n",
430 errcode, errname, errname, reason, server);
431 free(reason);
432
433 /* forget any dangling metadata */
434 conn->mime_type = mime_type_html;
435 conn->encoding = encoding_identity;
436
437 generate_header(conn, errcode, errname);
438 }
439
440
441
442 /* ---------------------------------------------------------------------------
443 * Parses a single HTTP request field. Returns string from end of [field] to
444 * first \r, \n or end of request string. Returns NULL if [field] can't be
445 * matched.
446 *
447 * You need to remember to deallocate the result.
448 * example: parse_field(conn, "Referer: ");
449 */
450 static char *parse_field(const struct connection *conn, const char *field)
451 {
452 size_t bound1, bound2;
453 char *pos;
454
455 /* find start */
456 pos = strstr(conn->request, field);
457 if (pos == NULL)
458 return (NULL);
459 bound1 = pos - conn->request + strlen(field);
460
461 /* find end */
462 for (bound2 = bound1;
463 conn->request[bound2] != '\r' &&
464 bound2 < conn->request_length; bound2++)
465 ;
466
467 /* copy to buffer */
468 return (split_string(conn->request, bound1, bound2));
469 }
470
471
472
473 /* ---------------------------------------------------------------------------
474 * Parse an HTTP request like "GET /hosts/?sort=in HTTP/1.1" to get the method
475 * (GET), the uri (/hosts/), the query (sort=in) and whether the UA will
476 * accept gzip encoding. Remember to deallocate all these buffers. Query
477 * can be NULL. The method will be returned in uppercase.
478 */
479 static int parse_request(struct connection *conn)
480 {
481 size_t bound1, bound2, mid;
482 char *accept_enc;
483
484 /* parse method */
485 for (bound1 = 0; bound1 < conn->request_length &&
486 conn->request[bound1] != ' '; bound1++)
487 ;
488
489 conn->method = split_string(conn->request, 0, bound1);
490 strntoupper(conn->method, bound1);
491
492 /* parse uri */
493 for (; bound1 < conn->request_length &&
494 conn->request[bound1] == ' '; bound1++)
495 ;
496
497 if (bound1 == conn->request_length)
498 return (0); /* fail */
499
500 for (bound2=bound1+1; bound2 < conn->request_length &&
501 conn->request[bound2] != ' ' &&
502 conn->request[bound2] != '\r'; bound2++)
503 ;
504
505 /* find query string */
506 for (mid=bound1; mid<bound2 && conn->request[mid] != '?'; mid++)
507 ;
508
509 if (conn->request[mid] == '?') {
510 conn->query = split_string(conn->request, mid+1, bound2);
511 bound2 = mid;
512 }
513
514 conn->uri = split_string(conn->request, bound1, bound2);
515
516 /* parse important fields */
517 accept_enc = parse_field(conn, "Accept-Encoding: ");
518 if (accept_enc != NULL) {
519 if (strstr(accept_enc, "gzip") != NULL)
520 conn->accept_gzip = 1;
521 free(accept_enc);
522 }
523 return (1);
524 }
525
526 /* FIXME: maybe we need a smarter way of doing static pages: */
527
528 /* ---------------------------------------------------------------------------
529 * Web interface: static stylesheet.
530 */
531 static void
532 static_style_css(struct connection *conn)
533 {
534 #include "stylecss.h"
535
536 conn->reply = style_css;
537 conn->reply_length = style_css_len;
538 conn->reply_dont_free = 1;
539 conn->mime_type = mime_type_css;
540 }
541
542 /* ---------------------------------------------------------------------------
543 * Web interface: static JavaScript.
544 */
545 static void
546 static_graph_js(struct connection *conn)
547 {
548 #include "graphjs.h"
549
550 conn->reply = graph_js;
551 conn->reply_length = graph_js_len;
552 conn->reply_dont_free = 1;
553 conn->mime_type = mime_type_js;
554 }
555
556 /* ---------------------------------------------------------------------------
557 * gzip a reply, if requested and possible. Don't bother with a minimum
558 * length requirement, I've never seen a page fail to compress.
559 */
560 static void
561 process_gzip(struct connection *conn)
562 {
563 char *buf;
564 size_t len;
565 z_stream zs;
566
567 if (!conn->accept_gzip)
568 return;
569
570 buf = xmalloc(conn->reply_length);
571 len = conn->reply_length;
572
573 zs.zalloc = Z_NULL;
574 zs.zfree = Z_NULL;
575 zs.opaque = Z_NULL;
576
577 if (deflateInit2(&zs, Z_BEST_COMPRESSION, Z_DEFLATED,
578 15+16, /* 15 = biggest window, 16 = add gzip header+trailer */
579 8 /* default */,
580 Z_DEFAULT_STRATEGY) != Z_OK)
581 return;
582
583 zs.avail_in = conn->reply_length;
584 zs.next_in = (unsigned char *)conn->reply;
585
586 zs.avail_out = conn->reply_length;
587 zs.next_out = (unsigned char *)buf;
588
589 if (deflate(&zs, Z_FINISH) != Z_STREAM_END) {
590 deflateEnd(&zs);
591 free(buf);
592 verbosef("failed to compress %u bytes", (unsigned int)len);
593 return;
594 }
595
596 if (conn->reply_dont_free)
597 conn->reply_dont_free = 0;
598 else
599 free(conn->reply);
600 conn->reply = buf;
601 conn->reply_length -= zs.avail_out;
602 conn->encoding = encoding_gzip;
603 deflateEnd(&zs);
604 }
605
606 /* ---------------------------------------------------------------------------
607 * Process a GET/HEAD request
608 */
609 static void process_get(struct connection *conn)
610 {
611 char *decoded_url, *safe_url;
612
613 verbosef("http: %s \"%s\" %s", conn->method, conn->uri,
614 (conn->query == NULL)?"":conn->query);
615
616 /* work out path of file being requested */
617 decoded_url = urldecode(conn->uri);
618
619 /* make sure it's safe */
620 safe_url = make_safe_uri(decoded_url);
621 free(decoded_url);
622 if (safe_url == NULL)
623 {
624 default_reply(conn, 400, "Bad Request",
625 "You requested an invalid URI: %s", conn->uri);
626 return;
627 }
628
629 if (strcmp(safe_url, "/") == 0) {
630 struct str *buf = html_front_page();
631 str_extract(buf, &(conn->reply_length), &(conn->reply));
632 conn->mime_type = mime_type_html;
633 }
634 else if (str_starts_with(safe_url, "/hosts/")) {
635 /* FIXME here - make this saner */
636 struct str *buf = html_hosts(safe_url, conn->query);
637 if (buf == NULL) {
638 default_reply(conn, 404, "Not Found",
639 "The page you requested could not be found.");
640 free(safe_url);
641 return;
642 }
643 str_extract(buf, &(conn->reply_length), &(conn->reply));
644 conn->mime_type = mime_type_html;
645 }
646 else if (str_starts_with(safe_url, "/graphs.xml")) {
647 struct str *buf = xml_graphs();
648 str_extract(buf, &(conn->reply_length), &(conn->reply));
649 conn->mime_type = mime_type_xml;
650 /* hack around Opera caching the XML */
651 conn->header_extra = "Pragma: no-cache\r\n";
652 }
653 else if (strcmp(safe_url, "/style.css") == 0)
654 static_style_css(conn);
655 else if (strcmp(safe_url, "/graph.js") == 0)
656 static_graph_js(conn);
657 else {
658 default_reply(conn, 404, "Not Found",
659 "The page you requested could not be found.");
660 free(safe_url);
661 return;
662 }
663 free(safe_url);
664
665 process_gzip(conn);
666 assert(conn->mime_type != NULL);
667 generate_header(conn, 200, "OK");
668 }
669
670
671
672 /* ---------------------------------------------------------------------------
673 * Process a request: build the header and reply, advance state.
674 */
675 static void process_request(struct connection *conn)
676 {
677 if (!parse_request(conn))
678 {
679 default_reply(conn, 400, "Bad Request",
680 "You sent a request that the server couldn't understand.");
681 }
682 else if (strcmp(conn->method, "GET") == 0)
683 {
684 process_get(conn);
685 }
686 else if (strcmp(conn->method, "HEAD") == 0)
687 {
688 process_get(conn);
689 conn->header_only = 1;
690 }
691 else
692 {
693 default_reply(conn, 501, "Not Implemented",
694 "The method you specified (%s) is not implemented.",
695 conn->method);
696 }
697
698 /* advance state */
699 if (conn->header_only)
700 conn->state = SEND_HEADER;
701 else
702 conn->state = SEND_HEADER_AND_REPLY;
703 }
704
705
706
707 /* ---------------------------------------------------------------------------
708 * Receiving request.
709 */
710 static void poll_recv_request(struct connection *conn)
711 {
712 char buf[65536];
713 ssize_t recvd;
714
715 recvd = recv(conn->socket, buf, sizeof(buf), 0);
716 dverbosef("poll_recv_request(%d) got %d bytes", conn->socket, (int)recvd);
717 if (recvd <= 0)
718 {
719 if (recvd == -1)
720 verbosef("recv(%d) error: %s", conn->socket, strerror(errno));
721 conn->state = DONE;
722 return;
723 }
724 conn->last_active_mono = now_mono();
725
726 /* append to conn->request */
727 conn->request = xrealloc(conn->request, conn->request_length+recvd+1);
728 memcpy(conn->request+conn->request_length, buf, (size_t)recvd);
729 conn->request_length += recvd;
730 conn->request[conn->request_length] = 0;
731
732 /* die if it's too long */
733 if (conn->request_length > MAX_REQUEST_LENGTH)
734 {
735 default_reply(conn, 413, "Request Entity Too Large",
736 "Your request was dropped because it was too long.");
737 conn->state = SEND_HEADER;
738 return;
739 }
740
741 /* process request if we have all of it */
742 if (conn->request_length > 4 &&
743 memcmp(conn->request+conn->request_length-4, "\r\n\r\n", 4) == 0)
744 {
745 process_request(conn);
746
747 /* request not needed anymore */
748 free(conn->request);
749 conn->request = NULL; /* important: don't free it again later */
750 }
751 }
752
753
754
755 /* ---------------------------------------------------------------------------
756 * Try to send header and [a part of the] reply in one packet.
757 */
758 static void poll_send_header_and_reply(struct connection *conn)
759 {
760 ssize_t sent;
761 struct iovec iov[2];
762
763 assert(!conn->header_only);
764 assert(conn->reply_length > 0);
765 assert(conn->header_sent == 0);
766
767 assert(conn->reply_sent == 0);
768
769 /* Fill out iovec */
770 iov[0].iov_base = conn->header;
771 iov[0].iov_len = conn->header_length;
772
773 iov[1].iov_base = conn->reply;
774 iov[1].iov_len = conn->reply_length;
775
776 sent = writev(conn->socket, iov, 2);
777 conn->last_active_mono = now_mono();
778
779 /* handle any errors (-1) or closure (0) in send() */
780 if (sent < 1) {
781 if (sent == -1)
782 verbosef("writev(%d) error: %s", conn->socket, strerror(errno));
783 conn->state = DONE;
784 return;
785 }
786
787 /* Figure out what we've sent. */
788 conn->total_sent += (unsigned int)sent;
789 if (sent < (ssize_t)conn->header_length) {
790 verbosef("partially sent header");
791 conn->header_sent = sent;
792 conn->state = SEND_HEADER;
793 return;
794 }
795 /* else */
796 conn->header_sent = conn->header_length;
797 sent -= conn->header_length;
798
799 if (sent < (ssize_t)conn->reply_length) {
800 verbosef("partially sent reply");
801 conn->reply_sent += sent;
802 conn->state = SEND_REPLY;
803 return;
804 }
805 /* else */
806 conn->reply_sent = conn->reply_length;
807 conn->state = DONE;
808 }
809
810 /* ---------------------------------------------------------------------------
811 * Sending header. Assumes conn->header is not NULL.
812 */
813 static void poll_send_header(struct connection *conn)
814 {
815 ssize_t sent;
816
817 sent = send(conn->socket, conn->header + conn->header_sent,
818 conn->header_length - conn->header_sent, 0);
819 conn->last_active_mono = now_mono();
820 dverbosef("poll_send_header(%d) sent %d bytes", conn->socket, (int)sent);
821
822 /* handle any errors (-1) or closure (0) in send() */
823 if (sent < 1)
824 {
825 if (sent == -1)
826 verbosef("send(%d) error: %s", conn->socket, strerror(errno));
827 conn->state = DONE;
828 return;
829 }
830 conn->header_sent += (unsigned int)sent;
831 conn->total_sent += (unsigned int)sent;
832
833 /* check if we're done sending */
834 if (conn->header_sent == conn->header_length)
835 {
836 if (conn->header_only)
837 conn->state = DONE;
838 else
839 conn->state = SEND_REPLY;
840 }
841 }
842
843
844
845 /* ---------------------------------------------------------------------------
846 * Sending reply.
847 */
848 static void poll_send_reply(struct connection *conn)
849 {
850 ssize_t sent;
851
852 sent = send(conn->socket,
853 conn->reply + conn->reply_sent,
854 conn->reply_length - conn->reply_sent, 0);
855 conn->last_active_mono = now_mono();
856 dverbosef("poll_send_reply(%d) sent %d: [%d-%d] of %d",
857 conn->socket, (int)sent,
858 (int)conn->reply_sent,
859 (int)(conn->reply_sent + sent - 1),
860 (int)conn->reply_length);
861
862 /* handle any errors (-1) or closure (0) in send() */
863 if (sent < 1)
864 {
865 if (sent == -1)
866 verbosef("send(%d) error: %s", conn->socket, strerror(errno));
867 else if (sent == 0)
868 verbosef("send(%d) closure", conn->socket);
869 conn->state = DONE;
870 return;
871 }
872 conn->reply_sent += (unsigned int)sent;
873 conn->total_sent += (unsigned int)sent;
874
875 /* check if we're done sending */
876 if (conn->reply_sent == conn->reply_length) conn->state = DONE;
877 }
878
879 /* Use getaddrinfo to figure out what type of socket to create and
880 * what to bind it to. "bindaddr" can be NULL. Remember to freeaddrinfo()
881 * the result.
882 */
883 static struct addrinfo *get_bind_addr(
884 const char *bindaddr, const unsigned short bindport)
885 {
886 struct addrinfo hints, *ai;
887 char portstr[6];
888 int ret;
889
890 memset(&hints, 0, sizeof(hints));
891 hints.ai_family = AF_UNSPEC;
892 hints.ai_socktype = SOCK_STREAM;
893 hints.ai_flags = AI_PASSIVE;
894
895 snprintf(portstr, sizeof(portstr), "%u", bindport);
896 if ((ret = getaddrinfo(bindaddr, portstr, &hints, &ai)))
897 err(1, "getaddrinfo(%s, %s) failed: %s",
898 bindaddr ? bindaddr : "NULL", portstr, gai_strerror(ret));
899 if (ai == NULL)
900 err(1, "getaddrinfo() returned NULL pointer");
901 return ai;
902 }
903
904 void http_add_bindaddr(const char *bindaddr)
905 {
906 struct bindaddr_entry *ent;
907
908 ent = xmalloc(sizeof(*ent));
909 ent->s = bindaddr;
910 STAILQ_INSERT_TAIL(&bindaddrs, ent, entries);
911 }
912
913 static void http_listen_one(struct addrinfo *ai,
914 const unsigned short bindport)
915 {
916 char ipaddr[INET6_ADDRSTRLEN];
917 int sockin, sockopt, ret;
918
919 /* format address into ipaddr string */
920 if ((ret = getnameinfo(ai->ai_addr, ai->ai_addrlen, ipaddr,
921 sizeof(ipaddr), NULL, 0, NI_NUMERICHOST)) != 0)
922 err(1, "getnameinfo failed: %s", gai_strerror(ret));
923
924 /* create incoming socket */
925 if ((sockin = socket(ai->ai_family, ai->ai_socktype,
926 ai->ai_protocol)) == -1) {
927 warn("http_listen_one(%s, %u): socket(%d (%s), %d, %d) failed",
928 ipaddr, (unsigned int)bindport,
929 ai->ai_family,
930 (ai->ai_family == AF_INET6) ? "AF_INET6" :
931 (ai->ai_family == AF_INET) ? "AF_INET" :
932 "?",
933 ai->ai_socktype, ai->ai_protocol);
934 return;
935 }
936
937 fd_set_nonblock(sockin);
938
939 /* reuse address */
940 sockopt = 1;
941 if (setsockopt(sockin, SOL_SOCKET, SO_REUSEADDR,
942 &sockopt, sizeof(sockopt)) == -1)
943 err(1, "can't set SO_REUSEADDR");
944
945 #ifdef IPV6_V6ONLY
946 /* explicitly disallow IPv4 mapped addresses since OpenBSD doesn't allow
947 * dual stack sockets under any circumstances
948 */
949 if (ai->ai_family == AF_INET6) {
950 sockopt = 1;
951 if (setsockopt(sockin, IPPROTO_IPV6, IPV6_V6ONLY,
952 &sockopt, sizeof(sockopt)) == -1)
953 err(1, "can't set IPV6_V6ONLY");
954 }
955 #endif
956
957 /* bind socket */
958 if (bind(sockin, ai->ai_addr, ai->ai_addrlen) == -1) {
959 warn("bind(\"%s\") failed", ipaddr);
960 close(sockin);
961 return;
962 }
963
964 /* listen on socket */
965 if (listen(sockin, 128) == -1)
966 err(1, "listen() failed");
967
968 verbosef("listening on http://%s%s%s:%u/",
969 (ai->ai_family == AF_INET6) ? "[" : "",
970 ipaddr,
971 (ai->ai_family == AF_INET6) ? "]" : "",
972 bindport);
973
974 /* add to insocks */
975 insocks = xrealloc(insocks, sizeof(*insocks) * (insock_num + 1));
976 insocks[insock_num++] = sockin;
977 }
978
979 /* Initialize the http sockets and listen on them. */
980 void http_listen(const unsigned short bindport)
981 {
982 /* If the user didn't specify any bind addresses, add a NULL.
983 * This will become a wildcard.
984 */
985 if (STAILQ_EMPTY(&bindaddrs))
986 http_add_bindaddr(NULL);
987
988 /* Listen on every specified interface. */
989 while (!STAILQ_EMPTY(&bindaddrs)) {
990 struct bindaddr_entry *bindaddr = STAILQ_FIRST(&bindaddrs);
991 struct addrinfo *ai, *ais = get_bind_addr(bindaddr->s, bindport);
992
993 /* There could be multiple addresses returned, handle them all. */
994 for (ai = ais; ai; ai = ai->ai_next)
995 http_listen_one(ai, bindport);
996
997 freeaddrinfo(ais);
998
999 STAILQ_REMOVE_HEAD(&bindaddrs, entries);
1000 free(bindaddr);
1001 }
1002
1003 if (insocks == NULL)
1004 errx(1, "was not able to bind any ports for http interface");
1005
1006 /* ignore SIGPIPE */
1007 if (signal(SIGPIPE, SIG_IGN) == SIG_ERR)
1008 err(1, "can't ignore SIGPIPE");
1009 }
1010
1011
1012
1013 /* ---------------------------------------------------------------------------
1014 * Set recv/send fd_sets and calculate timeout length.
1015 */
1016 void
1017 http_fd_set(fd_set *recv_set, fd_set *send_set, int *max_fd,
1018 struct timeval *timeout, int *need_timeout)
1019 {
1020 struct connection *conn, *next;
1021 int minidle = idletime + 1;
1022 unsigned int i;
1023
1024 #define MAX_FD_SET(sock, fdset) do { \
1025 FD_SET(sock, fdset); *max_fd = MAX(*max_fd, sock); } while(0)
1026
1027 for (i=0; i<insock_num; i++)
1028 MAX_FD_SET(insocks[i], recv_set);
1029
1030 LIST_FOREACH_SAFE(conn, &connlist, entries, next)
1031 {
1032 int idlefor = now_mono() - conn->last_active_mono;
1033
1034 /* Time out dead connections. */
1035 if (idlefor >= idletime) {
1036 char ipaddr[INET6_ADDRSTRLEN];
1037 /* FIXME: this is too late on FreeBSD, socket is invalid */
1038 int ret = getnameinfo((struct sockaddr *)&conn->client,
1039 sizeof(conn->client), ipaddr, sizeof(ipaddr),
1040 NULL, 0, NI_NUMERICHOST);
1041 if (ret == 0)
1042 verbosef("http socket timeout from %s (fd %d)",
1043 ipaddr, conn->socket);
1044 else
1045 warn("http socket timeout: getnameinfo error: %s",
1046 gai_strerror(ret));
1047 conn->state = DONE;
1048 }
1049
1050 /* Connections that need a timeout. */
1051 if (conn->state != DONE)
1052 minidle = MIN(minidle, (idletime - idlefor));
1053
1054 switch (conn->state)
1055 {
1056 case DONE:
1057 /* clean out stale connection */
1058 LIST_REMOVE(conn, entries);
1059 free_connection(conn);
1060 free(conn);
1061 break;
1062
1063 case RECV_REQUEST:
1064 MAX_FD_SET(conn->socket, recv_set);
1065 break;
1066
1067 case SEND_HEADER_AND_REPLY:
1068 case SEND_HEADER:
1069 case SEND_REPLY:
1070 MAX_FD_SET(conn->socket, send_set);
1071 break;
1072
1073 default: errx(1, "invalid state");
1074 }
1075 }
1076 #undef MAX_FD_SET
1077
1078 /* Only set timeout if cap hasn't already. */
1079 if ((*need_timeout == 0) && (minidle <= idletime)) {
1080 *need_timeout = 1;
1081 timeout->tv_sec = minidle;
1082 timeout->tv_usec = 0;
1083 }
1084 }
1085
1086
1087
1088 /* ---------------------------------------------------------------------------
1089 * poll connections that select() says need attention
1090 */
1091 void http_poll(fd_set *recv_set, fd_set *send_set)
1092 {
1093 struct connection *conn;
1094 unsigned int i;
1095
1096 for (i=0; i<insock_num; i++)
1097 if (FD_ISSET(insocks[i], recv_set))
1098 accept_connection(insocks[i]);
1099
1100 LIST_FOREACH(conn, &connlist, entries)
1101 switch (conn->state)
1102 {
1103 case RECV_REQUEST:
1104 if (FD_ISSET(conn->socket, recv_set)) poll_recv_request(conn);
1105 break;
1106
1107 case SEND_HEADER_AND_REPLY:
1108 if (FD_ISSET(conn->socket, send_set)) poll_send_header_and_reply(conn);
1109 break;
1110
1111 case SEND_HEADER:
1112 if (FD_ISSET(conn->socket, send_set)) poll_send_header(conn);
1113 break;
1114
1115 case SEND_REPLY:
1116 if (FD_ISSET(conn->socket, send_set)) poll_send_reply(conn);
1117 break;
1118
1119 case DONE: /* fallthrough */
1120 default: errx(1, "invalid state");
1121 }
1122 }
1123
1124 void http_stop(void) {
1125 struct connection *conn;
1126 unsigned int i;
1127
1128 /* Close listening sockets. */
1129 for (i=0; i<insock_num; i++)
1130 close(insocks[i]);
1131 free(insocks);
1132 insocks = NULL;
1133
1134 /* Close in-flight connections. */
1135 LIST_FOREACH(conn, &connlist, entries) {
1136 LIST_REMOVE(conn, entries);
1137 free_connection(conn);
1138 free(conn);
1139 }
1140 }
1141
1142 /* vim:set ts=4 sw=4 et tw=78: */