2 * $Id: http.c,v 1.4 2006-11-27 14:35:15 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 static urldecode(char *i, char *o)
172 sscanf(i, "%2hhx", o);
182 void http_addheader(struct http_response *r, const char *name, const char *value)
184 struct http_channel *c = r->channel;
185 struct http_header *h = nmem_malloc(c->nmem, sizeof *h);
186 h->name = nmem_strdup(c->nmem, name);
187 h->value = nmem_strdup(c->nmem, value);
188 h->next = r->headers;
192 char *http_argbyname(struct http_request *r, char *name)
194 struct http_argument *p;
197 for (p = r->arguments; p; p = p->next)
198 if (!strcmp(p->name, name))
203 char *http_headerbyname(struct http_request *r, char *name)
205 struct http_header *p;
206 for (p = r->headers; p; p = p->next)
207 if (!strcmp(p->name, name))
212 struct http_response *http_create_response(struct http_channel *c)
214 struct http_response *r = nmem_malloc(c->nmem, sizeof(*r));
215 strcpy(r->code, "200");
223 // Check if we have a complete request. Return 0 or length (including trailing newline)
224 // FIXME: Does not deal gracefully with requests carrying payload
225 // but this is kind of OK since we will reject anything other than an empty GET
226 static int request_check(struct http_buf *queue)
232 http_buf_peek(queue, tmp, 4096);
233 while (*buf) // Check if we have a sequence of lines terminated by an empty line
235 char *b = strstr(buf, "\r\n");
240 len += (b - buf) + 2;
248 struct http_request *http_parse_request(struct http_channel *c, struct http_buf **queue,
251 struct http_request *r = nmem_malloc(c->nmem, sizeof(*r));
258 if (http_buf_read(queue, buf, len) < len)
265 for (p = buf, p2 = r->method; *p && *p != ' ' && p - buf < 19; p++)
269 yaz_log(YLOG_WARN, "Unexpected HTTP method in request");
274 if (!(buf = strchr(buf, ' ')))
276 yaz_log(YLOG_WARN, "Syntax error in request (1)");
280 if (!(p = strchr(buf, ' ')))
282 yaz_log(YLOG_WARN, "Syntax error in request (2)");
286 if ((p2 = strchr(buf, '?'))) // Do we have arguments?
288 r->path = nmem_strdup(c->nmem, buf);
294 struct http_argument *a;
295 char *equal = strchr(p2, '=');
296 char *eoa = strchr(p2, '&');
299 yaz_log(YLOG_WARN, "Expected '=' in argument");
303 eoa = equal + strlen(equal); // last argument
306 a = nmem_malloc(c->nmem, sizeof(struct http_argument));
308 a->name = nmem_strdup(c->nmem, p2);
309 urldecode(equal, equal);
310 a->value = nmem_strdup(c->nmem, equal);
311 a->next = r->arguments;
318 if (strncmp(buf, "HTTP/", 5))
319 strcpy(r->http_version, "1.0");
323 if (!(p = strstr(buf, "\r\n")))
327 strcpy(r->http_version, buf);
330 strcpy(c->version, r->http_version);
335 if (!(p = strstr(buf, "\r\n")))
341 struct http_header *h = nmem_malloc(c->nmem, sizeof(*h));
342 if (!(p2 = strchr(buf, ':')))
345 h->name = nmem_strdup(c->nmem, buf);
348 if (p2 >= p) // Empty header?
354 h->value = nmem_strdup(c->nmem, p2);
355 h->next = r->headers;
365 static struct http_buf *http_serialize_response(struct http_channel *c,
366 struct http_response *r)
368 wrbuf_rewind(c->wrbuf);
369 struct http_header *h;
371 wrbuf_printf(c->wrbuf, "HTTP/1.1 %s %s\r\n", r->code, r->msg);
372 for (h = r->headers; h; h = h->next)
373 wrbuf_printf(c->wrbuf, "%s: %s\r\n", h->name, h->value);
374 wrbuf_printf(c->wrbuf, "Content-length: %d\r\n", r->payload ? strlen(r->payload) : 0);
375 wrbuf_printf(c->wrbuf, "Content-type: text/xml\r\n");
376 wrbuf_puts(c->wrbuf, "\r\n");
379 wrbuf_puts(c->wrbuf, r->payload);
381 return http_buf_bywrbuf(c->wrbuf);
384 // Serialize a HTTP request
385 static struct http_buf *http_serialize_request(struct http_request *r)
387 struct http_channel *c = r->channel;
388 wrbuf_rewind(c->wrbuf);
389 struct http_header *h;
390 struct http_argument *a;
392 wrbuf_printf(c->wrbuf, "%s %s", r->method, r->path);
396 wrbuf_putc(c->wrbuf, '?');
397 for (a = r->arguments; a; a = a->next) {
398 if (a != r->arguments)
399 wrbuf_putc(c->wrbuf, '&');
400 wrbuf_printf(c->wrbuf, "%s=%s", a->name, a->value);
404 wrbuf_printf(c->wrbuf, " HTTP/%s\r\n", r->http_version);
406 for (h = r->headers; h; h = h->next)
407 wrbuf_printf(c->wrbuf, "%s: %s\r\n", h->name, h->value);
409 wrbuf_puts(c->wrbuf, "\r\n");
411 return http_buf_bywrbuf(c->wrbuf);
416 static void http_destroy(IOCHAN i)
418 struct http_channel *s = iochan_getdata(i);
422 if (s->proxy->iochan)
424 close(iochan_getfd(s->proxy->iochan));
425 iochan_destroy(s->proxy->iochan);
427 http_buf_destroy_queue(s->proxy->oqueue);
430 http_buf_destroy_queue(s->iqueue);
431 http_buf_destroy_queue(s->oqueue);
432 nmem_destroy(s->nmem);
433 wrbuf_free(s->wrbuf, 1);
435 close(iochan_getfd(i));
439 static int http_weshouldproxy(struct http_request *rq)
441 if (proxy_addr && !strstr(rq->path, "search.pz2"))
446 static int http_proxy(struct http_request *rq)
448 struct http_channel *c = rq->channel;
449 struct http_proxy *p = c->proxy;
450 struct http_header *hp;
451 struct http_buf *requestbuf;
453 if (!p) // This is a new connection. Create a proxy channel
460 if (!(pe = getprotobyname("tcp"))) {
463 if ((sock = socket(PF_INET, SOCK_STREAM, pe->p_proto)) < 0)
465 yaz_log(YLOG_WARN|YLOG_ERRNO, "socket");
468 if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (char*)
469 &one, sizeof(one)) < 0)
471 if ((flags = fcntl(sock, F_GETFL, 0)) < 0)
472 yaz_log(YLOG_FATAL|YLOG_ERRNO, "fcntl");
473 if (fcntl(sock, F_SETFL, flags | O_NONBLOCK) < 0)
474 yaz_log(YLOG_FATAL|YLOG_ERRNO, "fcntl2");
475 if (connect(sock, (struct sockaddr *) proxy_addr, sizeof(*proxy_addr)) < 0)
476 if (errno != EINPROGRESS)
478 yaz_log(YLOG_WARN|YLOG_ERRNO, "Proxy connect");
482 p = xmalloc(sizeof(struct http_proxy));
486 // We will add EVENT_OUTPUT below
487 p->iochan = iochan_create(sock, proxy_io, EVENT_INPUT);
488 iochan_setdata(p->iochan, p);
489 p->iochan->next = channel_list;
490 channel_list = p->iochan;
493 // Modify Host: header
494 for (hp = rq->headers; hp; hp = hp->next)
495 if (!strcmp(hp->name, "Host"))
499 yaz_log(YLOG_WARN, "Failed to find Host header in proxy");
502 hp->value = nmem_strdup(c->nmem, proxy_url);
503 requestbuf = http_serialize_request(rq);
504 http_buf_enqueue(&p->oqueue, requestbuf);
505 iochan_setflag(p->iochan, EVENT_OUTPUT);
509 static void http_io(IOCHAN i, int event)
511 struct http_channel *hc = iochan_getdata(i);
512 struct http_request *request;
513 struct http_response *response;
518 struct http_buf *htbuf;
521 htbuf = http_buf_create();
522 res = read(iochan_getfd(i), htbuf->buf, HTTP_BUF_SIZE -1);
523 if (res <= 0 && errno != EAGAIN)
525 http_buf_destroy(htbuf);
531 htbuf->buf[res] = '\0';
533 http_buf_enqueue(&hc->iqueue, htbuf);
536 if ((reqlen = request_check(hc->iqueue)) <= 2)
539 nmem_reset(hc->nmem);
540 if (!(request = http_parse_request(hc, &hc->iqueue, reqlen)))
542 yaz_log(YLOG_WARN, "Failed to parse request");
546 yaz_log(YLOG_LOG, "Request: %s %s v %s", request->method, request->path,
547 request->http_version);
548 if (http_weshouldproxy(request))
553 // Execute our business logic!
554 response = http_command(request);
560 if (!(hb = http_serialize_response(hc, response)))
565 http_buf_enqueue(&hc->oqueue, hb);
566 iochan_setflags(i, EVENT_OUTPUT); // Turns off input selecting
570 yaz_log(YLOG_DEBUG, "We think we have more input to read. Forcing event");
571 iochan_setevent(i, EVENT_INPUT);
579 struct http_buf *wb = hc->oqueue;
580 res = write(iochan_getfd(hc->iochan), wb->buf + wb->offset, wb->len);
583 yaz_log(YLOG_WARN|YLOG_ERRNO, "write");
589 hc->oqueue = hc->oqueue->next;
590 http_buf_destroy(wb);
598 if (!strcmp(hc->version, "1.0"))
604 iochan_setflags(i, EVENT_INPUT); // Turns off output flag
608 if (!hc->oqueue && hc->proxy && !hc->proxy->iochan)
609 http_destroy(i); // Server closed; we're done
612 yaz_log(YLOG_WARN, "Unexpected event on connection");
617 // Handles I/O on a client connection to a backend web server (proxy mode)
618 static void proxy_io(IOCHAN pi, int event)
620 struct http_proxy *pc = iochan_getdata(pi);
621 struct http_channel *hc = pc->channel;
626 struct http_buf *htbuf;
629 htbuf = http_buf_create();
630 res = read(iochan_getfd(pi), htbuf->buf, HTTP_BUF_SIZE -1);
631 if (res == 0 || (res < 0 && errno != EINPROGRESS))
635 yaz_log(YLOG_WARN, "Proxy read came up short");
636 // Close channel and alert client HTTP channel that we're gone
637 http_buf_destroy(htbuf);
638 close(iochan_getfd(pi));
644 http_destroy(hc->iochan);
650 htbuf->buf[res] = '\0';
652 http_buf_enqueue(&hc->oqueue, htbuf);
654 iochan_setflag(hc->iochan, EVENT_OUTPUT);
657 if (!(htbuf = pc->oqueue))
659 iochan_clearflag(pi, EVENT_OUTPUT);
662 res = write(iochan_getfd(pi), htbuf->buf + htbuf->offset, htbuf->len);
665 yaz_log(YLOG_WARN|YLOG_ERRNO, "write");
666 http_destroy(hc->iochan);
669 if (res == htbuf->len)
671 struct http_buf *np = htbuf->next;
672 http_buf_destroy(htbuf);
678 htbuf->offset += res;
682 iochan_setflags(pi, EVENT_INPUT); // Turns off output flag
686 yaz_log(YLOG_WARN, "Unexpected event on connection");
687 http_destroy(hc->iochan);
691 /* Accept a new command connection */
692 static void http_accept(IOCHAN i, int event)
694 struct sockaddr_in addr;
695 int fd = iochan_getfd(i);
700 struct http_channel *ch;
703 if ((s = accept(fd, (struct sockaddr *) &addr, &len)) < 0)
705 yaz_log(YLOG_WARN|YLOG_ERRNO, "accept");
708 if ((flags = fcntl(s, F_GETFL, 0)) < 0)
709 yaz_log(YLOG_FATAL|YLOG_ERRNO, "fcntl");
710 if (fcntl(s, F_SETFL, flags | O_NONBLOCK) < 0)
711 yaz_log(YLOG_FATAL|YLOG_ERRNO, "fcntl2");
713 yaz_log(YLOG_LOG, "New command connection");
714 c = iochan_create(s, http_io, EVENT_INPUT | EVENT_EXCEPT);
716 ch = xmalloc(sizeof(*ch));
718 ch->nmem = nmem_create();
719 ch->wrbuf = wrbuf_alloc();
721 ch->iqueue = ch->oqueue = 0;
722 iochan_setdata(c, ch);
724 c->next = channel_list;
728 /* Create a http-channel listener */
729 void http_init(int port)
734 struct sockaddr_in myaddr;
737 yaz_log(YLOG_LOG, "HTTP port is %d", port);
738 if (!(p = getprotobyname("tcp"))) {
741 if ((l = socket(PF_INET, SOCK_STREAM, p->p_proto)) < 0)
742 yaz_log(YLOG_FATAL|YLOG_ERRNO, "socket");
743 if (setsockopt(l, SOL_SOCKET, SO_REUSEADDR, (char*)
744 &one, sizeof(one)) < 0)
747 bzero(&myaddr, sizeof myaddr);
748 myaddr.sin_family = AF_INET;
749 myaddr.sin_addr.s_addr = INADDR_ANY;
750 myaddr.sin_port = htons(port);
751 if (bind(l, (struct sockaddr *) &myaddr, sizeof myaddr) < 0)
752 yaz_log(YLOG_FATAL|YLOG_ERRNO, "bind");
753 if (listen(l, SOMAXCONN) < 0)
754 yaz_log(YLOG_FATAL|YLOG_ERRNO, "listen");
756 c = iochan_create(l, http_accept, EVENT_INPUT | EVENT_EXCEPT);
757 c->next = channel_list;
761 void http_set_proxyaddr(char *host)
767 strcpy(proxy_url, host);
768 p = strchr(host, ':');
769 yaz_log(YLOG_DEBUG, "Proxying for %s", host);
776 if (!(he = gethostbyname(host)))
778 fprintf(stderr, "Failed to lookup '%s'\n", host);
781 proxy_addr = xmalloc(sizeof(struct sockaddr_in));
782 proxy_addr->sin_family = he->h_addrtype;
783 memcpy(&proxy_addr->sin_addr.s_addr, he->h_addr_list[0], he->h_length);
784 proxy_addr->sin_port = htons(port);
790 * indent-tabs-mode: nil
792 * vim: shiftwidth=4 tabstop=8 expandtab