2 * $Id: http.c,v 1.1 2006-12-20 20:47:16 quinn Exp $
6 #include <sys/socket.h>
18 #include <yaz/yaz-util.h>
19 #include <yaz/comstack.h>
27 #include "http_command.h"
29 static void proxy_io(IOCHAN i, int event);
30 static struct http_channel *http_create(void);
31 static void http_destroy(IOCHAN i);
33 extern IOCHAN channel_list;
35 static struct sockaddr_in *proxy_addr = 0; // If this is set, we proxy normal HTTP requests
36 static char proxy_url[256] = "";
37 static struct http_buf *http_buf_freelist = 0;
38 static struct http_channel *http_channel_freelist = 0;
40 static struct http_buf *http_buf_create()
44 if (http_buf_freelist)
46 r = http_buf_freelist;
47 http_buf_freelist = http_buf_freelist->next;
50 r = xmalloc(sizeof(struct http_buf));
57 static void http_buf_destroy(struct http_buf *b)
59 b->next = http_buf_freelist;
60 http_buf_freelist = b;
63 static void http_buf_destroy_queue(struct http_buf *b)
75 // Calculate length of chain
76 static int http_buf_len(struct http_buf *b)
79 for (; b; b = b->next)
85 static struct http_buf *http_buf_bybuf(char *b, int len)
87 struct http_buf *res = 0;
88 struct http_buf **p = &res;
92 *p = http_buf_create();
94 if (tocopy > HTTP_BUF_SIZE)
95 tocopy = HTTP_BUF_SIZE;
96 memcpy((*p)->buf, b, tocopy);
105 // Add a (chain of) buffers to the end of an existing queue.
106 static void http_buf_enqueue(struct http_buf **queue, struct http_buf *b)
109 queue = &(*queue)->next;
113 static struct http_buf *http_buf_bywrbuf(WRBUF wrbuf)
115 // Heavens to Betsy (buf)!
116 return http_buf_bybuf(wrbuf_buf(wrbuf), wrbuf_len(wrbuf));
119 // Non-destructively collapse chain of buffers into a string (max *len)
121 static int http_buf_peek(struct http_buf *b, char *buf, int len)
124 while (b && rd < len)
126 int toread = len - rd;
129 memcpy(buf + rd, b->buf + b->offset, toread);
137 // Ddestructively munch up to len from head of queue.
138 static int http_buf_read(struct http_buf **b, char *buf, int len)
141 while ((*b) && rd < len)
143 int toread = len - rd;
144 if (toread > (*b)->len)
146 memcpy(buf + rd, (*b)->buf + (*b)->offset, toread);
148 if (toread < (*b)->len)
151 (*b)->offset += toread;
156 struct http_buf *n = (*b)->next;
157 http_buf_destroy(*b);
165 void static urldecode(char *i, char *o)
177 sscanf(i, "%2hhx", o);
187 void http_addheader(struct http_response *r, const char *name, const char *value)
189 struct http_channel *c = r->channel;
190 struct http_header *h = nmem_malloc(c->nmem, sizeof *h);
191 h->name = nmem_strdup(c->nmem, name);
192 h->value = nmem_strdup(c->nmem, value);
193 h->next = r->headers;
197 char *http_argbyname(struct http_request *r, char *name)
199 struct http_argument *p;
202 for (p = r->arguments; p; p = p->next)
203 if (!strcmp(p->name, name))
208 char *http_headerbyname(struct http_request *r, char *name)
210 struct http_header *p;
211 for (p = r->headers; p; p = p->next)
212 if (!strcmp(p->name, name))
217 struct http_response *http_create_response(struct http_channel *c)
219 struct http_response *r = nmem_malloc(c->nmem, sizeof(*r));
220 strcpy(r->code, "200");
228 // Check if we have a complete request. Return 0 or length (including trailing newline)
229 // FIXME: Does not deal gracefully with requests carrying payload
230 // but this is kind of OK since we will reject anything other than an empty GET
231 static int request_check(struct http_buf *queue)
237 http_buf_peek(queue, tmp, 4096);
238 while (*buf) // Check if we have a sequence of lines terminated by an empty line
240 char *b = strstr(buf, "\r\n");
245 len += (b - buf) + 2;
253 struct http_request *http_parse_request(struct http_channel *c, struct http_buf **queue,
256 struct http_request *r = nmem_malloc(c->nmem, sizeof(*r));
263 if (http_buf_read(queue, buf, len) < len)
270 for (p = buf, p2 = r->method; *p && *p != ' ' && p - buf < 19; p++)
274 yaz_log(YLOG_WARN, "Unexpected HTTP method in request");
279 if (!(buf = strchr(buf, ' ')))
281 yaz_log(YLOG_WARN, "Syntax error in request (1)");
285 if (!(p = strchr(buf, ' ')))
287 yaz_log(YLOG_WARN, "Syntax error in request (2)");
291 if ((p2 = strchr(buf, '?'))) // Do we have arguments?
293 r->path = nmem_strdup(c->nmem, buf);
299 struct http_argument *a;
300 char *equal = strchr(p2, '=');
301 char *eoa = strchr(p2, '&');
304 yaz_log(YLOG_WARN, "Expected '=' in argument");
308 eoa = equal + strlen(equal); // last argument
311 a = nmem_malloc(c->nmem, sizeof(struct http_argument));
313 a->name = nmem_strdup(c->nmem, p2);
314 urldecode(equal, equal);
315 a->value = nmem_strdup(c->nmem, equal);
316 a->next = r->arguments;
323 if (strncmp(buf, "HTTP/", 5))
324 strcpy(r->http_version, "1.0");
328 if (!(p = strstr(buf, "\r\n")))
332 strcpy(r->http_version, buf);
335 strcpy(c->version, r->http_version);
340 if (!(p = strstr(buf, "\r\n")))
346 struct http_header *h = nmem_malloc(c->nmem, sizeof(*h));
347 if (!(p2 = strchr(buf, ':')))
350 h->name = nmem_strdup(c->nmem, buf);
353 if (p2 >= p) // Empty header?
359 h->value = nmem_strdup(c->nmem, p2);
360 h->next = r->headers;
370 static struct http_buf *http_serialize_response(struct http_channel *c,
371 struct http_response *r)
373 wrbuf_rewind(c->wrbuf);
374 struct http_header *h;
376 wrbuf_printf(c->wrbuf, "HTTP/1.1 %s %s\r\n", r->code, r->msg);
377 for (h = r->headers; h; h = h->next)
378 wrbuf_printf(c->wrbuf, "%s: %s\r\n", h->name, h->value);
379 wrbuf_printf(c->wrbuf, "Content-length: %d\r\n", r->payload ? (int) strlen(r->payload) : 0);
380 wrbuf_printf(c->wrbuf, "Content-type: text/xml\r\n");
381 wrbuf_puts(c->wrbuf, "\r\n");
384 wrbuf_puts(c->wrbuf, r->payload);
386 return http_buf_bywrbuf(c->wrbuf);
389 // Serialize a HTTP request
390 static struct http_buf *http_serialize_request(struct http_request *r)
392 struct http_channel *c = r->channel;
393 wrbuf_rewind(c->wrbuf);
394 struct http_header *h;
395 struct http_argument *a;
397 wrbuf_printf(c->wrbuf, "%s %s", r->method, r->path);
401 wrbuf_putc(c->wrbuf, '?');
402 for (a = r->arguments; a; a = a->next) {
403 if (a != r->arguments)
404 wrbuf_putc(c->wrbuf, '&');
405 wrbuf_printf(c->wrbuf, "%s=%s", a->name, a->value);
409 wrbuf_printf(c->wrbuf, " HTTP/%s\r\n", r->http_version);
411 for (h = r->headers; h; h = h->next)
412 wrbuf_printf(c->wrbuf, "%s: %s\r\n", h->name, h->value);
414 wrbuf_puts(c->wrbuf, "\r\n");
416 return http_buf_bywrbuf(c->wrbuf);
420 static int http_weshouldproxy(struct http_request *rq)
422 if (proxy_addr && !strstr(rq->path, "search.pz2"))
427 static int http_proxy(struct http_request *rq)
429 struct http_channel *c = rq->channel;
430 struct http_proxy *p = c->proxy;
431 struct http_header *hp;
432 struct http_buf *requestbuf;
434 if (!p) // This is a new connection. Create a proxy channel
441 if (!(pe = getprotobyname("tcp"))) {
444 if ((sock = socket(PF_INET, SOCK_STREAM, pe->p_proto)) < 0)
446 yaz_log(YLOG_WARN|YLOG_ERRNO, "socket");
449 if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (char*)
450 &one, sizeof(one)) < 0)
452 if ((flags = fcntl(sock, F_GETFL, 0)) < 0)
453 yaz_log(YLOG_FATAL|YLOG_ERRNO, "fcntl");
454 if (fcntl(sock, F_SETFL, flags | O_NONBLOCK) < 0)
455 yaz_log(YLOG_FATAL|YLOG_ERRNO, "fcntl2");
456 if (connect(sock, (struct sockaddr *) proxy_addr, sizeof(*proxy_addr)) < 0)
457 if (errno != EINPROGRESS)
459 yaz_log(YLOG_WARN|YLOG_ERRNO, "Proxy connect");
463 p = xmalloc(sizeof(struct http_proxy));
467 // We will add EVENT_OUTPUT below
468 p->iochan = iochan_create(sock, proxy_io, EVENT_INPUT);
469 iochan_setdata(p->iochan, p);
470 p->iochan->next = channel_list;
471 channel_list = p->iochan;
474 // Modify Host: header
475 for (hp = rq->headers; hp; hp = hp->next)
476 if (!strcmp(hp->name, "Host"))
480 yaz_log(YLOG_WARN, "Failed to find Host header in proxy");
483 hp->value = nmem_strdup(c->nmem, proxy_url);
484 requestbuf = http_serialize_request(rq);
485 http_buf_enqueue(&p->oqueue, requestbuf);
486 iochan_setflag(p->iochan, EVENT_OUTPUT);
490 void http_send_response(struct http_channel *ch)
492 struct http_response *rs = ch->response;
494 struct http_buf *hb = http_serialize_response(ch, rs);
497 yaz_log(YLOG_WARN, "Failed to serialize HTTP response");
498 http_destroy(ch->iochan);
502 http_buf_enqueue(&ch->oqueue, hb);
503 iochan_setflag(ch->iochan, EVENT_OUTPUT);
504 ch->state = Http_Idle;
508 static void http_io(IOCHAN i, int event)
510 struct http_channel *hc = iochan_getdata(i);
515 struct http_buf *htbuf;
518 htbuf = http_buf_create();
519 res = read(iochan_getfd(i), htbuf->buf, HTTP_BUF_SIZE -1);
520 if (res <= 0 && errno != EAGAIN)
522 http_buf_destroy(htbuf);
528 htbuf->buf[res] = '\0';
530 http_buf_enqueue(&hc->iqueue, htbuf);
533 if (hc->state == Http_Busy)
536 if ((reqlen = request_check(hc->iqueue)) <= 2)
539 nmem_reset(hc->nmem);
540 if (!(hc->request = http_parse_request(hc, &hc->iqueue, reqlen)))
542 yaz_log(YLOG_WARN, "Failed to parse request");
547 yaz_log(YLOG_LOG, "Request: %s %s v %s", hc->request->method,
548 hc->request->path, hc->request->http_version);
549 if (http_weshouldproxy(hc->request))
550 http_proxy(hc->request);
553 // Execute our business logic!
554 hc->state = Http_Busy;
559 yaz_log(YLOG_DEBUG, "We think we have more input to read. Forcing event");
560 iochan_setevent(i, EVENT_INPUT);
568 struct http_buf *wb = hc->oqueue;
569 res = write(iochan_getfd(hc->iochan), wb->buf + wb->offset, wb->len);
572 yaz_log(YLOG_WARN|YLOG_ERRNO, "write");
578 hc->oqueue = hc->oqueue->next;
579 http_buf_destroy(wb);
587 if (!strcmp(hc->version, "1.0"))
594 iochan_clearflag(i, EVENT_OUTPUT);
596 iochan_setevent(hc->iochan, EVENT_INPUT);
601 if (!hc->oqueue && hc->proxy && !hc->proxy->iochan)
602 http_destroy(i); // Server closed; we're done
605 yaz_log(YLOG_WARN, "Unexpected event on connection");
610 // Handles I/O on a client connection to a backend web server (proxy mode)
611 static void proxy_io(IOCHAN pi, int event)
613 struct http_proxy *pc = iochan_getdata(pi);
614 struct http_channel *hc = pc->channel;
619 struct http_buf *htbuf;
622 htbuf = http_buf_create();
623 res = read(iochan_getfd(pi), htbuf->buf, HTTP_BUF_SIZE -1);
624 if (res == 0 || (res < 0 && errno != EINPROGRESS))
628 yaz_log(YLOG_WARN, "Proxy read came up short");
629 // Close channel and alert client HTTP channel that we're gone
630 http_buf_destroy(htbuf);
631 close(iochan_getfd(pi));
637 http_destroy(hc->iochan);
643 htbuf->buf[res] = '\0';
645 http_buf_enqueue(&hc->oqueue, htbuf);
647 iochan_setflag(hc->iochan, EVENT_OUTPUT);
650 if (!(htbuf = pc->oqueue))
652 iochan_clearflag(pi, EVENT_OUTPUT);
655 res = write(iochan_getfd(pi), htbuf->buf + htbuf->offset, htbuf->len);
658 yaz_log(YLOG_WARN|YLOG_ERRNO, "write");
659 http_destroy(hc->iochan);
662 if (res == htbuf->len)
664 struct http_buf *np = htbuf->next;
665 http_buf_destroy(htbuf);
671 htbuf->offset += res;
675 iochan_setflags(pi, EVENT_INPUT); // Turns off output flag
679 yaz_log(YLOG_WARN, "Unexpected event on connection");
680 http_destroy(hc->iochan);
685 static void http_destroy(IOCHAN i)
687 struct http_channel *s = iochan_getdata(i);
691 if (s->proxy->iochan)
693 close(iochan_getfd(s->proxy->iochan));
694 iochan_destroy(s->proxy->iochan);
696 http_buf_destroy_queue(s->proxy->oqueue);
699 s->next = http_channel_freelist;
700 http_channel_freelist = s;
701 close(iochan_getfd(i));
705 static struct http_channel *http_create(void)
707 struct http_channel *r = http_channel_freelist;
711 http_channel_freelist = r->next;
713 wrbuf_rewind(r->wrbuf);
717 r = xmalloc(sizeof(struct http_channel));
718 r->nmem = nmem_create();
719 r->wrbuf = wrbuf_alloc();
723 r->iqueue = r->oqueue = 0;
724 r->state = Http_Idle;
731 /* Accept a new command connection */
732 static void http_accept(IOCHAN i, int event)
734 struct sockaddr_in addr;
735 int fd = iochan_getfd(i);
740 struct http_channel *ch;
743 if ((s = accept(fd, (struct sockaddr *) &addr, &len)) < 0)
745 yaz_log(YLOG_WARN|YLOG_ERRNO, "accept");
748 if ((flags = fcntl(s, F_GETFL, 0)) < 0)
749 yaz_log(YLOG_FATAL|YLOG_ERRNO, "fcntl");
750 if (fcntl(s, F_SETFL, flags | O_NONBLOCK) < 0)
751 yaz_log(YLOG_FATAL|YLOG_ERRNO, "fcntl2");
753 yaz_log(YLOG_LOG, "New command connection");
754 c = iochan_create(s, http_io, EVENT_INPUT | EVENT_EXCEPT);
758 iochan_setdata(c, ch);
760 c->next = channel_list;
764 /* Create a http-channel listener, syntax [host:]port */
765 void http_init(const char *addr)
770 struct sockaddr_in myaddr;
775 yaz_log(YLOG_LOG, "HTTP listener is %s", addr);
777 bzero(&myaddr, sizeof myaddr);
778 myaddr.sin_family = AF_INET;
779 pp = strchr(addr, ':');
786 strncpy(hostname, addr, len);
787 hostname[len] = '\0';
788 if (!(he = gethostbyname(hostname)))
790 yaz_log(YLOG_FATAL, "Unable to resolve '%s'", hostname);
793 memcpy(&myaddr.sin_addr.s_addr, he->h_addr_list[0], he->h_length);
799 myaddr.sin_addr.s_addr = INADDR_ANY;
801 myaddr.sin_port = htons(port);
803 if (!(p = getprotobyname("tcp"))) {
806 if ((l = socket(PF_INET, SOCK_STREAM, p->p_proto)) < 0)
807 yaz_log(YLOG_FATAL|YLOG_ERRNO, "socket");
808 if (setsockopt(l, SOL_SOCKET, SO_REUSEADDR, (char*)
809 &one, sizeof(one)) < 0)
812 if (bind(l, (struct sockaddr *) &myaddr, sizeof myaddr) < 0)
813 yaz_log(YLOG_FATAL|YLOG_ERRNO, "bind");
814 if (listen(l, SOMAXCONN) < 0)
815 yaz_log(YLOG_FATAL|YLOG_ERRNO, "listen");
817 c = iochan_create(l, http_accept, EVENT_INPUT | EVENT_EXCEPT);
818 c->next = channel_list;
822 void http_set_proxyaddr(char *host)
828 strcpy(proxy_url, host);
829 p = strchr(host, ':');
830 yaz_log(YLOG_DEBUG, "Proxying for %s", host);
837 if (!(he = gethostbyname(host)))
839 fprintf(stderr, "Failed to lookup '%s'\n", host);
842 proxy_addr = xmalloc(sizeof(struct sockaddr_in));
843 proxy_addr->sin_family = he->h_addrtype;
844 memcpy(&proxy_addr->sin_addr.s_addr, he->h_addr_list[0], he->h_length);
845 proxy_addr->sin_port = htons(port);
851 * indent-tabs-mode: nil
853 * vim: shiftwidth=4 tabstop=8 expandtab