2 * $Id: http.c,v 1.2 2006-11-24 20:29:07 quinn Exp $
6 #include <sys/socket.h>
17 #include <yaz/yaz-util.h>
18 #include <yaz/comstack.h>
26 #include "http_command.h"
28 static void proxy_io(IOCHAN i, int event);
30 extern IOCHAN channel_list;
32 static struct sockaddr_in *proxy_addr = 0; // If this is set, we proxy normal HTTP requests
33 static char proxy_url[256] = "";
34 static struct http_buf *http_buf_freelist = 0;
36 static struct http_buf *http_buf_create()
40 if (http_buf_freelist)
42 r = http_buf_freelist;
43 http_buf_freelist = http_buf_freelist->next;
46 r = xmalloc(sizeof(struct http_buf));
53 static void http_buf_destroy(struct http_buf *b)
55 b->next = http_buf_freelist;
56 http_buf_freelist = b;
59 static void http_buf_destroy_queue(struct http_buf *b)
71 // Calculate length of chain
72 static int http_buf_len(struct http_buf *b)
75 for (; b; b = b->next)
81 static struct http_buf *http_buf_bybuf(char *b, int len)
83 struct http_buf *res = 0;
84 struct http_buf **p = &res;
88 *p = http_buf_create();
90 if (tocopy > HTTP_BUF_SIZE)
91 tocopy = HTTP_BUF_SIZE;
92 memcpy((*p)->buf, b, tocopy);
101 // Add a (chain of) buffers to the end of an existing queue.
102 static void http_buf_enqueue(struct http_buf **queue, struct http_buf *b)
105 queue = &(*queue)->next;
109 static struct http_buf *http_buf_bywrbuf(WRBUF wrbuf)
111 return http_buf_bybuf(wrbuf_buf(wrbuf), wrbuf_len(wrbuf));
114 // Non-destructively collapse chain of buffers into a string (max *len)
116 static int http_buf_peek(struct http_buf *b, char *buf, int len)
119 while (b && rd < len)
121 int toread = len - rd;
124 memcpy(buf + rd, b->buf + b->offset, toread);
132 // Ddestructively munch up to len from head of queue.
133 static int http_buf_read(struct http_buf **b, char *buf, int len)
136 while ((*b) && rd < len)
138 int toread = len - rd;
139 if (toread > (*b)->len)
141 memcpy(buf + rd, (*b)->buf + (*b)->offset, toread);
143 if (toread < (*b)->len)
146 (*b)->offset += toread;
151 struct http_buf *n = (*b)->next;
152 http_buf_destroy(*b);
160 void http_addheader(struct http_response *r, const char *name, const char *value)
162 struct http_channel *c = r->channel;
163 struct http_header *h = nmem_malloc(c->nmem, sizeof *h);
164 h->name = nmem_strdup(c->nmem, name);
165 h->value = nmem_strdup(c->nmem, value);
166 h->next = r->headers;
170 char *http_argbyname(struct http_request *r, char *name)
172 struct http_argument *p;
175 for (p = r->arguments; p; p = p->next)
176 if (!strcmp(p->name, name))
181 char *http_headerbyname(struct http_request *r, char *name)
183 struct http_header *p;
184 for (p = r->headers; p; p = p->next)
185 if (!strcmp(p->name, name))
190 struct http_response *http_create_response(struct http_channel *c)
192 struct http_response *r = nmem_malloc(c->nmem, sizeof(*r));
193 strcpy(r->code, "200");
201 // Check if we have a complete request. Return 0 or length (including trailing newline)
202 // FIXME: Does not deal gracefully with requests carrying payload
203 // but this is kind of OK since we will reject anything other than an empty GET
204 static int request_check(struct http_buf *queue)
210 http_buf_peek(queue, tmp, 4096);
211 while (*buf) // Check if we have a sequence of lines terminated by an empty line
213 char *b = strstr(buf, "\r\n");
218 len += (b - buf) + 2;
226 struct http_request *http_parse_request(struct http_channel *c, struct http_buf **queue,
229 struct http_request *r = nmem_malloc(c->nmem, sizeof(*r));
236 if (http_buf_read(queue, buf, len) < len)
243 for (p = buf, p2 = r->method; *p && *p != ' ' && p - buf < 19; p++)
247 yaz_log(YLOG_WARN, "Unexpected HTTP method in request");
252 if (!(buf = strchr(buf, ' ')))
254 yaz_log(YLOG_WARN, "Syntax error in request (1)");
258 if (!(p = strchr(buf, ' ')))
260 yaz_log(YLOG_WARN, "Syntax error in request (2)");
264 if ((p2 = strchr(buf, '?'))) // Do we have arguments?
266 r->path = nmem_strdup(c->nmem, buf);
272 struct http_argument *a;
273 char *equal = strchr(p2, '=');
274 char *eoa = strchr(p2, '&');
277 yaz_log(YLOG_WARN, "Expected '=' in argument");
281 eoa = equal + strlen(equal); // last argument
284 a = nmem_malloc(c->nmem, sizeof(struct http_argument));
286 a->name = nmem_strdup(c->nmem, p2);
287 a->value = nmem_strdup(c->nmem, equal);
288 a->next = r->arguments;
295 if (strncmp(buf, "HTTP/", 5))
296 strcpy(r->http_version, "1.0");
300 if (!(p = strstr(buf, "\r\n")))
304 strcpy(r->http_version, buf);
307 strcpy(c->version, r->http_version);
312 if (!(p = strstr(buf, "\r\n")))
318 struct http_header *h = nmem_malloc(c->nmem, sizeof(*h));
319 if (!(p2 = strchr(buf, ':')))
322 h->name = nmem_strdup(c->nmem, buf);
325 if (p2 >= p) // Empty header?
331 h->value = nmem_strdup(c->nmem, p2);
332 h->next = r->headers;
342 static struct http_buf *http_serialize_response(struct http_channel *c,
343 struct http_response *r)
345 wrbuf_rewind(c->wrbuf);
346 struct http_header *h;
348 wrbuf_printf(c->wrbuf, "HTTP/1.1 %s %s\r\n", r->code, r->msg);
349 for (h = r->headers; h; h = h->next)
350 wrbuf_printf(c->wrbuf, "%s: %s\r\n", h->name, h->value);
351 wrbuf_printf(c->wrbuf, "Content-length: %d\r\n", r->payload ? strlen(r->payload) : 0);
352 wrbuf_printf(c->wrbuf, "Content-type: text/xml\r\n");
353 wrbuf_puts(c->wrbuf, "\r\n");
356 wrbuf_puts(c->wrbuf, r->payload);
358 return http_buf_bywrbuf(c->wrbuf);
361 // Serialize a HTTP request
362 static struct http_buf *http_serialize_request(struct http_request *r)
364 struct http_channel *c = r->channel;
365 wrbuf_rewind(c->wrbuf);
366 struct http_header *h;
367 struct http_argument *a;
369 wrbuf_printf(c->wrbuf, "%s %s", r->method, r->path);
373 wrbuf_putc(c->wrbuf, '?');
374 for (a = r->arguments; a; a = a->next) {
375 if (a != r->arguments)
376 wrbuf_putc(c->wrbuf, '&');
377 wrbuf_printf(c->wrbuf, "%s=%s", a->name, a->value);
381 wrbuf_printf(c->wrbuf, " HTTP/%s\r\n", r->http_version);
383 for (h = r->headers; h; h = h->next)
384 wrbuf_printf(c->wrbuf, "%s: %s\r\n", h->name, h->value);
386 wrbuf_puts(c->wrbuf, "\r\n");
388 return http_buf_bywrbuf(c->wrbuf);
393 static void http_destroy(IOCHAN i)
395 struct http_channel *s = iochan_getdata(i);
397 yaz_log(YLOG_DEBUG, "Destroying http channel");
400 yaz_log(YLOG_DEBUG, "Destroying Proxy channel");
401 if (s->proxy->iochan)
403 close(iochan_getfd(s->proxy->iochan));
404 iochan_destroy(s->proxy->iochan);
406 http_buf_destroy_queue(s->proxy->oqueue);
409 http_buf_destroy_queue(s->iqueue);
410 http_buf_destroy_queue(s->oqueue);
411 nmem_destroy(s->nmem);
412 wrbuf_free(s->wrbuf, 1);
414 close(iochan_getfd(i));
418 static int http_weshouldproxy(struct http_request *rq)
420 if (proxy_addr && !strstr(rq->path, "search.pz2"))
425 static int http_proxy(struct http_request *rq)
427 struct http_channel *c = rq->channel;
428 struct http_proxy *p = c->proxy;
429 struct http_header *hp;
430 struct http_buf *requestbuf;
432 yaz_log(YLOG_DEBUG, "Proxy request");
434 if (!p) // This is a new connection. Create a proxy channel
441 yaz_log(YLOG_DEBUG, "Creating a new proxy channel");
442 if (!(pe = getprotobyname("tcp"))) {
445 if ((sock = socket(PF_INET, SOCK_STREAM, pe->p_proto)) < 0)
447 yaz_log(YLOG_WARN|YLOG_ERRNO, "socket");
450 if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (char*)
451 &one, sizeof(one)) < 0)
453 if ((flags = fcntl(sock, F_GETFL, 0)) < 0)
454 yaz_log(YLOG_FATAL|YLOG_ERRNO, "fcntl");
455 if (fcntl(sock, F_SETFL, flags | O_NONBLOCK) < 0)
456 yaz_log(YLOG_FATAL|YLOG_ERRNO, "fcntl2");
457 if (connect(sock, (struct sockaddr *) proxy_addr, sizeof(*proxy_addr)) < 0)
458 if (errno != EINPROGRESS)
460 yaz_log(YLOG_WARN|YLOG_ERRNO, "Proxy connect");
464 p = xmalloc(sizeof(struct http_proxy));
468 // We will add EVENT_OUTPUT below
469 p->iochan = iochan_create(sock, proxy_io, EVENT_INPUT);
470 iochan_setdata(p->iochan, p);
471 p->iochan->next = channel_list;
472 channel_list = p->iochan;
475 // Modify Host: header
476 for (hp = rq->headers; hp; hp = hp->next)
477 if (!strcmp(hp->name, "Host"))
481 yaz_log(YLOG_WARN, "Failed to find Host header in proxy");
484 hp->value = nmem_strdup(c->nmem, proxy_url);
485 requestbuf = http_serialize_request(rq);
486 http_buf_enqueue(&p->oqueue, requestbuf);
487 iochan_setflag(p->iochan, EVENT_OUTPUT);
491 static void http_io(IOCHAN i, int event)
493 struct http_channel *hc = iochan_getdata(i);
494 struct http_request *request;
495 struct http_response *response;
500 struct http_buf *htbuf;
503 yaz_log(YLOG_DEBUG, "HTTP Input event");
505 htbuf = http_buf_create();
506 res = read(iochan_getfd(i), htbuf->buf, HTTP_BUF_SIZE -1);
507 if (res <= 0 && errno != EAGAIN)
509 yaz_log(YLOG_WARN|YLOG_ERRNO, "HTTP read");
510 http_buf_destroy(htbuf);
516 htbuf->buf[res] = '\0';
518 http_buf_enqueue(&hc->iqueue, htbuf);
521 if ((reqlen = request_check(hc->iqueue)) <= 2)
523 yaz_log(YLOG_DEBUG, "We don't have a complete HTTP request yet");
526 yaz_log(YLOG_DEBUG, "We think we have a complete HTTP request (len %d)", reqlen);
528 nmem_reset(hc->nmem);
529 if (!(request = http_parse_request(hc, &hc->iqueue, reqlen)))
531 yaz_log(YLOG_WARN, "Failed to parse request");
535 yaz_log(YLOG_LOG, "Request: %s %s v %s", request->method, request->path,
536 request->http_version);
537 if (http_weshouldproxy(request))
542 // Execute our business logic!
543 response = http_command(request);
549 if (!(hb = http_serialize_response(hc, response)))
554 http_buf_enqueue(&hc->oqueue, hb);
555 yaz_log(YLOG_DEBUG, "Response ready");
556 iochan_setflags(i, EVENT_OUTPUT); // Turns off input selecting
560 yaz_log(YLOG_DEBUG, "We think we have more input to read. Forcing event");
561 iochan_setevent(i, EVENT_INPUT);
567 yaz_log(YLOG_DEBUG, "HTTP output event");
570 struct http_buf *wb = hc->oqueue;
571 res = write(iochan_getfd(hc->iochan), wb->buf + wb->offset, wb->len);
574 yaz_log(YLOG_WARN|YLOG_ERRNO, "write");
578 yaz_log(YLOG_DEBUG, "HTTP Wrote %d octets", res);
581 hc->oqueue = hc->oqueue->next;
582 http_buf_destroy(wb);
590 yaz_log(YLOG_DEBUG, "Writing finished");
591 if (!strcmp(hc->version, "1.0"))
593 yaz_log(YLOG_DEBUG, "Closing 1.0 connection");
598 iochan_setflags(i, EVENT_INPUT); // Turns off output flag
602 if (!hc->oqueue && hc->proxy && !hc->proxy->iochan)
603 http_destroy(i); // Server closed; we're done
606 yaz_log(YLOG_WARN, "Unexpected event on connection");
611 // Handles I/O on a client connection to a backend web server (proxy mode)
612 static void proxy_io(IOCHAN pi, int event)
614 struct http_proxy *pc = iochan_getdata(pi);
615 struct http_channel *hc = pc->channel;
620 struct http_buf *htbuf;
623 yaz_log(YLOG_DEBUG, "Proxy input event");
624 htbuf = http_buf_create();
625 res = read(iochan_getfd(pi), htbuf->buf, HTTP_BUF_SIZE -1);
626 yaz_log(YLOG_DEBUG, "Proxy read %d bytes.", res);
627 if (res == 0 || (res < 0 && errno != EINPROGRESS))
631 yaz_log(YLOG_WARN, "Proxy read came up short");
632 // Close channel and alert client HTTP channel that we're gone
633 http_buf_destroy(htbuf);
634 close(iochan_getfd(pi));
640 http_destroy(hc->iochan);
646 htbuf->buf[res] = '\0';
648 http_buf_enqueue(&hc->oqueue, htbuf);
650 iochan_setflag(hc->iochan, EVENT_OUTPUT);
653 yaz_log(YLOG_DEBUG, "Proxy output event");
654 if (!(htbuf = pc->oqueue))
656 iochan_clearflag(pi, EVENT_OUTPUT);
659 res = write(iochan_getfd(pi), htbuf->buf + htbuf->offset, htbuf->len);
662 yaz_log(YLOG_WARN|YLOG_ERRNO, "write");
663 http_destroy(hc->iochan);
666 if (res == htbuf->len)
668 struct http_buf *np = htbuf->next;
669 http_buf_destroy(htbuf);
675 htbuf->offset += res;
679 iochan_setflags(pi, EVENT_INPUT); // Turns off output flag
683 yaz_log(YLOG_WARN, "Unexpected event on connection");
684 http_destroy(hc->iochan);
688 /* Accept a new command connection */
689 static void http_accept(IOCHAN i, int event)
691 struct sockaddr_in addr;
692 int fd = iochan_getfd(i);
697 struct http_channel *ch;
700 if ((s = accept(fd, (struct sockaddr *) &addr, &len)) < 0)
702 yaz_log(YLOG_WARN|YLOG_ERRNO, "accept");
705 if ((flags = fcntl(s, F_GETFL, 0)) < 0)
706 yaz_log(YLOG_FATAL|YLOG_ERRNO, "fcntl");
707 if (fcntl(s, F_SETFL, flags | O_NONBLOCK) < 0)
708 yaz_log(YLOG_FATAL|YLOG_ERRNO, "fcntl2");
710 yaz_log(YLOG_LOG, "New command connection");
711 c = iochan_create(s, http_io, EVENT_INPUT | EVENT_EXCEPT);
713 ch = xmalloc(sizeof(*ch));
715 ch->nmem = nmem_create();
716 ch->wrbuf = wrbuf_alloc();
718 ch->iqueue = ch->oqueue = 0;
719 iochan_setdata(c, ch);
721 c->next = channel_list;
725 /* Create a http-channel listener */
726 void http_init(int port)
731 struct sockaddr_in myaddr;
734 yaz_log(YLOG_LOG, "HTTP port is %d", port);
735 if (!(p = getprotobyname("tcp"))) {
738 if ((l = socket(PF_INET, SOCK_STREAM, p->p_proto)) < 0)
739 yaz_log(YLOG_FATAL|YLOG_ERRNO, "socket");
740 if (setsockopt(l, SOL_SOCKET, SO_REUSEADDR, (char*)
741 &one, sizeof(one)) < 0)
744 bzero(&myaddr, sizeof myaddr);
745 myaddr.sin_family = AF_INET;
746 myaddr.sin_addr.s_addr = INADDR_ANY;
747 myaddr.sin_port = htons(port);
748 if (bind(l, (struct sockaddr *) &myaddr, sizeof myaddr) < 0)
749 yaz_log(YLOG_FATAL|YLOG_ERRNO, "bind");
750 if (listen(l, SOMAXCONN) < 0)
751 yaz_log(YLOG_FATAL|YLOG_ERRNO, "listen");
753 c = iochan_create(l, http_accept, EVENT_INPUT | EVENT_EXCEPT);
754 c->next = channel_list;
758 void http_set_proxyaddr(char *host)
764 strcpy(proxy_url, host);
765 p = strchr(host, ':');
766 yaz_log(YLOG_DEBUG, "Proxying for %s", host);
773 if (!(he = gethostbyname(host)))
775 fprintf(stderr, "Failed to lookup '%s'\n", host);
778 proxy_addr = xmalloc(sizeof(struct sockaddr_in));
779 proxy_addr->sin_family = he->h_addrtype;
780 memcpy(&proxy_addr->sin_addr.s_addr, he->h_addr_list[0], he->h_length);
781 proxy_addr->sin_port = htons(port);
787 * indent-tabs-mode: nil
789 * vim: shiftwidth=4 tabstop=8 expandtab