1 /* $Id: http.c,v 1.23 2007-04-10 08:48:56 adam Exp $
2 Copyright (c) 2006-2007, Index Data.
4 This file is part of Pazpar2.
6 Pazpar2 is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 2, or (at your option) any later
11 Pazpar2 is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with Pazpar2; see the file LICENSE. If not, write to the
18 Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
23 #include <sys/socket.h>
24 #include <sys/types.h>
40 #include <netinet/in.h>
41 #include <arpa/inet.h>
44 #include <yaz/yaz-util.h>
45 #include <yaz/comstack.h>
53 #include "http_command.h"
55 static void proxy_io(IOCHAN i, int event);
56 static struct http_channel *http_create(const char *addr);
57 static void http_destroy(IOCHAN i);
59 extern IOCHAN channel_list;
60 extern struct parameters global_parameters;
63 // If this is set, we proxy normal HTTP requests
64 static struct sockaddr_in *proxy_addr = 0;
65 static char proxy_url[256] = "";
66 static char myurl[256] = "";
67 static struct http_buf *http_buf_freelist = 0;
68 static struct http_channel *http_channel_freelist = 0;
70 static struct http_buf *http_buf_create()
74 if (http_buf_freelist)
76 r = http_buf_freelist;
77 http_buf_freelist = http_buf_freelist->next;
80 r = xmalloc(sizeof(struct http_buf));
87 static void http_buf_destroy(struct http_buf *b)
89 b->next = http_buf_freelist;
90 http_buf_freelist = b;
93 static void http_buf_destroy_queue(struct http_buf *b)
105 // Calculate length of chain
106 static int http_buf_len(struct http_buf *b)
109 for (; b; b = b->next)
115 static struct http_buf *http_buf_bybuf(char *b, int len)
117 struct http_buf *res = 0;
118 struct http_buf **p = &res;
123 if (tocopy > HTTP_BUF_SIZE)
124 tocopy = HTTP_BUF_SIZE;
125 *p = http_buf_create();
126 memcpy((*p)->buf, b, tocopy);
135 // Add a (chain of) buffers to the end of an existing queue.
136 static void http_buf_enqueue(struct http_buf **queue, struct http_buf *b)
139 queue = &(*queue)->next;
143 static struct http_buf *http_buf_bywrbuf(WRBUF wrbuf)
145 // Heavens to Betsy (buf)!
146 return http_buf_bybuf(wrbuf_buf(wrbuf), wrbuf_len(wrbuf));
149 // Non-destructively collapse chain of buffers into a string (max *len)
151 static int http_buf_peek(struct http_buf *b, char *buf, int len)
154 while (b && rd < len)
156 int toread = len - rd;
159 memcpy(buf + rd, b->buf + b->offset, toread);
167 // Ddestructively munch up to len from head of queue.
168 static int http_buf_read(struct http_buf **b, char *buf, int len)
171 while ((*b) && rd < len)
173 int toread = len - rd;
174 if (toread > (*b)->len)
176 memcpy(buf + rd, (*b)->buf + (*b)->offset, toread);
178 if (toread < (*b)->len)
181 (*b)->offset += toread;
186 struct http_buf *n = (*b)->next;
187 http_buf_destroy(*b);
195 // Buffers may overlap.
196 static void urldecode(char *i, char *o)
208 sscanf(i, "%2hhx", o);
218 // Warning: Buffers may not overlap
219 void urlencode(const char *i, char *o)
223 if (strchr(" /:", *i))
225 sprintf(o, "%%%.2X", (int) *i);
235 void http_addheader(struct http_response *r, const char *name, const char *value)
237 struct http_channel *c = r->channel;
238 struct http_header *h = nmem_malloc(c->nmem, sizeof *h);
239 h->name = nmem_strdup(c->nmem, name);
240 h->value = nmem_strdup(c->nmem, value);
241 h->next = r->headers;
245 char *http_argbyname(struct http_request *r, char *name)
247 struct http_argument *p;
250 for (p = r->arguments; p; p = p->next)
251 if (!strcmp(p->name, name))
256 char *http_headerbyname(struct http_header *h, char *name)
258 for (; h; h = h->next)
259 if (!strcmp(h->name, name))
264 struct http_response *http_create_response(struct http_channel *c)
266 struct http_response *r = nmem_malloc(c->nmem, sizeof(*r));
267 strcpy(r->code, "200");
275 // Check if buf contains a package (minus payload)
276 static int package_check(const char *buf)
279 while (*buf) // Check if we have a sequence of lines terminated by an empty line
281 char *b = strstr(buf, "\r\n");
286 len += (b - buf) + 2;
294 // Check if we have a request. Return 0 or length
295 // (including trailing CRNL) FIXME: Does not deal gracefully with requests
296 // carrying payload but this is kind of OK since we will reject anything
297 // other than an empty GET
298 static int request_check(struct http_buf *queue)
302 http_buf_peek(queue, tmp, 4096);
303 return package_check(tmp);
306 struct http_response *http_parse_response_buf(struct http_channel *c, const char *buf, int len)
309 struct http_response *r = http_create_response(c);
311 struct http_header **hp = &r->headers;
315 memcpy(tmp, buf, len);
316 for (p = tmp; *p && *p != ' '; p++) // Skip HTTP version
320 for (p2 = p; *p2 && *p2 != ' ' && p2 - p < 3; p2++)
321 r->code[p2 - p] = *p2;
322 if (!(p = strstr(tmp, "\r\n")))
327 if (!(p2 = strstr(p, "\r\n")))
329 if (p == p2) // End of headers
333 struct http_header *h = *hp = nmem_malloc(c->nmem, sizeof(*h));
334 char *value = strchr(p, ':');
338 h->name = nmem_strdup(c->nmem, p);
339 while (isspace(*value))
341 if (value >= p2) // Empty header;
348 h->value = nmem_strdup(c->nmem, value);
357 struct http_request *http_parse_request(struct http_channel *c, struct http_buf **queue,
360 struct http_request *r = nmem_malloc(c->nmem, sizeof(*r));
367 if (http_buf_read(queue, buf, len) < len)
375 for (p = buf, p2 = r->method; *p && *p != ' ' && p - buf < 19; p++)
379 yaz_log(YLOG_WARN, "Unexpected HTTP method in request");
384 if (!(buf = strchr(buf, ' ')))
386 yaz_log(YLOG_WARN, "Syntax error in request (1)");
390 if (!(p = strchr(buf, ' ')))
392 yaz_log(YLOG_WARN, "Syntax error in request (2)");
396 if ((p2 = strchr(buf, '?'))) // Do we have arguments?
398 r->path = nmem_strdup(c->nmem, buf);
401 r->search = nmem_strdup(c->nmem, p2);
405 struct http_argument *a;
406 char *equal = strchr(p2, '=');
407 char *eoa = strchr(p2, '&');
410 yaz_log(YLOG_WARN, "Expected '=' in argument");
414 eoa = equal + strlen(equal); // last argument
417 a = nmem_malloc(c->nmem, sizeof(struct http_argument));
419 a->name = nmem_strdup(c->nmem, p2);
420 urldecode(equal, equal);
421 a->value = nmem_strdup(c->nmem, equal);
422 a->next = r->arguments;
429 if (strncmp(buf, "HTTP/", 5))
430 strcpy(r->http_version, "1.0");
434 if (!(p = strstr(buf, "\r\n")))
438 strcpy(r->http_version, buf);
441 strcpy(c->version, r->http_version);
446 if (!(p = strstr(buf, "\r\n")))
452 struct http_header *h = nmem_malloc(c->nmem, sizeof(*h));
453 if (!(p2 = strchr(buf, ':')))
456 h->name = nmem_strdup(c->nmem, buf);
459 if (p2 >= p) // Empty header?
465 h->value = nmem_strdup(c->nmem, p2);
466 h->next = r->headers;
475 static struct http_buf *http_serialize_response(struct http_channel *c,
476 struct http_response *r)
478 struct http_header *h;
480 wrbuf_rewind(c->wrbuf);
481 wrbuf_printf(c->wrbuf, "HTTP/1.1 %s %s\r\n", r->code, r->msg);
482 for (h = r->headers; h; h = h->next)
483 wrbuf_printf(c->wrbuf, "%s: %s\r\n", h->name, h->value);
486 wrbuf_printf(c->wrbuf, "Content-length: %d\r\n", r->payload ?
487 (int) strlen(r->payload) : 0);
488 wrbuf_printf(c->wrbuf, "Content-type: text/xml\r\n");
490 wrbuf_puts(c->wrbuf, "\r\n");
493 wrbuf_puts(c->wrbuf, r->payload);
495 return http_buf_bywrbuf(c->wrbuf);
498 // Serialize a HTTP request
499 static struct http_buf *http_serialize_request(struct http_request *r)
501 struct http_channel *c = r->channel;
502 struct http_header *h;
503 struct http_argument *a;
505 wrbuf_rewind(c->wrbuf);
506 wrbuf_printf(c->wrbuf, "%s %s", r->method, r->path);
510 wrbuf_putc(c->wrbuf, '?');
511 for (a = r->arguments; a; a = a->next) {
512 if (a != r->arguments)
513 wrbuf_putc(c->wrbuf, '&');
514 wrbuf_printf(c->wrbuf, "%s=%s", a->name, a->value);
518 wrbuf_printf(c->wrbuf, " HTTP/%s\r\n", r->http_version);
520 for (h = r->headers; h; h = h->next)
521 wrbuf_printf(c->wrbuf, "%s: %s\r\n", h->name, h->value);
523 wrbuf_puts(c->wrbuf, "\r\n");
525 return http_buf_bywrbuf(c->wrbuf);
529 static int http_weshouldproxy(struct http_request *rq)
531 if (proxy_addr && !strstr(rq->path, "search.pz2"))
537 struct http_header * http_header_append(struct http_channel *ch,
538 struct http_header * hp,
542 struct http_header *hpnew = 0;
547 while (hp && hp->next)
550 if(name && strlen(name)&& value && strlen(value)){
551 hpnew = nmem_malloc(ch->nmem, sizeof *hpnew);
552 hpnew->name = nmem_strdup(ch->nmem, name);
553 hpnew->value = nmem_strdup(ch->nmem, value);
567 static int http_proxy(struct http_request *rq)
569 struct http_channel *c = rq->channel;
570 struct http_proxy *p = c->proxy;
571 struct http_header *hp;
572 struct http_buf *requestbuf;
573 char server_via[128] = "";
574 char server_port[16] = "";
575 struct conf_server *ser = global_parameters.server;
577 if (!p) // This is a new connection. Create a proxy channel
584 if (!(pe = getprotobyname("tcp"))) {
587 if ((sock = socket(PF_INET, SOCK_STREAM, pe->p_proto)) < 0)
589 yaz_log(YLOG_WARN|YLOG_ERRNO, "socket");
592 if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (char*)
593 &one, sizeof(one)) < 0)
595 if ((flags = fcntl(sock, F_GETFL, 0)) < 0)
596 yaz_log(YLOG_FATAL|YLOG_ERRNO, "fcntl");
597 if (fcntl(sock, F_SETFL, flags | O_NONBLOCK) < 0)
598 yaz_log(YLOG_FATAL|YLOG_ERRNO, "fcntl2");
599 if (connect(sock, (struct sockaddr *) proxy_addr,
600 sizeof(*proxy_addr)) < 0)
601 if (errno != EINPROGRESS)
603 yaz_log(YLOG_WARN|YLOG_ERRNO, "Proxy connect");
607 p = xmalloc(sizeof(struct http_proxy));
610 p->first_response = 1;
612 // We will add EVENT_OUTPUT below
613 p->iochan = iochan_create(sock, proxy_io, EVENT_INPUT);
614 iochan_setdata(p->iochan, p);
615 p->iochan->next = channel_list;
616 channel_list = p->iochan;
619 // Do _not_ modify Host: header, just checking it's existence
620 for (hp = rq->headers; hp; hp = hp->next)
621 if (!strcmp(hp->name, "Host"))
625 yaz_log(YLOG_WARN, "Failed to find Host header in proxy");
629 // Add new header about paraz2 version, host, remote client address, etc.
632 hp = http_header_append(c, hp,
633 "X-Pazpar2-Version", PACKAGE_VERSION);
634 hp = http_header_append(c, hp,
635 "X-Pazpar2-Server-Host", ser->host);
636 sprintf(server_port, "%d", ser->port);
637 hp = http_header_append(c, hp,
638 "X-Pazpar2-Server-Port", server_port);
639 sprintf(server_via, "1.1 %s:%s (%s/%s)",
640 ser->host, server_port, PACKAGE_NAME, PACKAGE_VERSION);
641 hp = http_header_append(c, hp, "Via" , server_via);
642 hp = http_header_append(c, hp, "X-Forwarded-For", c->addr);
645 requestbuf = http_serialize_request(rq);
646 http_buf_enqueue(&p->oqueue, requestbuf);
647 iochan_setflag(p->iochan, EVENT_OUTPUT);
651 void http_send_response(struct http_channel *ch)
653 struct http_response *rs = ch->response;
657 hb = http_serialize_response(ch, rs);
660 yaz_log(YLOG_WARN, "Failed to serialize HTTP response");
661 http_destroy(ch->iochan);
665 http_buf_enqueue(&ch->oqueue, hb);
666 iochan_setflag(ch->iochan, EVENT_OUTPUT);
667 ch->state = Http_Idle;
671 static void http_io(IOCHAN i, int event)
673 struct http_channel *hc = iochan_getdata(i);
678 struct http_buf *htbuf;
681 htbuf = http_buf_create();
682 res = read(iochan_getfd(i), htbuf->buf, HTTP_BUF_SIZE -1);
683 if (res == -1 && errno == EAGAIN)
685 http_buf_destroy(htbuf);
690 http_buf_destroy(htbuf);
696 htbuf->buf[res] = '\0';
698 http_buf_enqueue(&hc->iqueue, htbuf);
701 if (hc->state == Http_Busy)
703 if ((reqlen = request_check(hc->iqueue)) <= 2)
706 nmem_reset(hc->nmem);
707 if (!(hc->request = http_parse_request(hc, &hc->iqueue, reqlen)))
709 yaz_log(YLOG_WARN, "Failed to parse request");
714 yaz_log(YLOG_LOG, "Request: %s %s%s%s", hc->request->method,
716 *hc->request->search ? "?" : "",
717 hc->request->search);
718 if (http_weshouldproxy(hc->request))
719 http_proxy(hc->request);
722 // Execute our business logic!
723 hc->state = Http_Busy;
728 yaz_log(YLOG_DEBUG, "We think we have more input to read. Forcing event");
729 iochan_setevent(i, EVENT_INPUT);
737 struct http_buf *wb = hc->oqueue;
738 res = write(iochan_getfd(hc->iochan), wb->buf + wb->offset, wb->len);
741 yaz_log(YLOG_WARN|YLOG_ERRNO, "write");
747 hc->oqueue = hc->oqueue->next;
748 http_buf_destroy(wb);
756 if (!strcmp(hc->version, "1.0"))
763 iochan_clearflag(i, EVENT_OUTPUT);
765 iochan_setevent(hc->iochan, EVENT_INPUT);
770 if (!hc->oqueue && hc->proxy && !hc->proxy->iochan)
771 http_destroy(i); // Server closed; we're done
774 yaz_log(YLOG_WARN, "Unexpected event on connection");
780 // If this hostname contains our proxy host as a prefix, replace with myurl
781 static char *sub_hostname(struct http_channel *c, char *buf)
784 if (strlen(buf) > 1023)
786 if (strncmp(buf, "http://", 7))
788 if (!strncmp(buf + 7, proxy_url, strlen(proxy_url)))
791 strcat(tmp, buf + strlen(proxy_url) + 7);
792 return nmem_strdup(c->nmem, tmp);
798 // Handles I/O on a client connection to a backend web server (proxy mode)
799 static void proxy_io(IOCHAN pi, int event)
801 struct http_proxy *pc = iochan_getdata(pi);
802 struct http_channel *hc = pc->channel;
807 struct http_buf *htbuf;
810 htbuf = http_buf_create();
811 res = read(iochan_getfd(pi), htbuf->buf, HTTP_BUF_SIZE -1);
812 if (res == 0 || (res < 0 && errno != EINPROGRESS))
816 yaz_log(YLOG_WARN, "Proxy read came up short");
817 // Close channel and alert client HTTP channel that we're gone
818 http_buf_destroy(htbuf);
819 close(iochan_getfd(pi));
825 http_destroy(hc->iochan);
831 htbuf->buf[res] = '\0';
835 if (pc->first_response) // Check if this is a redirect
838 if ((len = package_check(htbuf->buf)))
840 struct http_response *res = http_parse_response_buf(hc, htbuf->buf, len);
843 struct http_header *h;
844 for (h = res->headers; h; h = h->next)
845 if (!strcmp(h->name, "Location"))
847 // We found a location header. Rewrite it.
848 struct http_buf *buf;
849 h->value = sub_hostname(hc, h->value);
850 buf = http_serialize_response(hc, res);
851 yaz_log(YLOG_LOG, "Proxy rewrite");
852 http_buf_enqueue(&hc->oqueue, buf);
858 pc->first_response = 0;
861 // Write any remaining payload
862 if (htbuf->len - htbuf->offset > 0)
863 http_buf_enqueue(&hc->oqueue, htbuf);
865 iochan_setflag(hc->iochan, EVENT_OUTPUT);
868 if (!(htbuf = pc->oqueue))
870 iochan_clearflag(pi, EVENT_OUTPUT);
873 res = write(iochan_getfd(pi), htbuf->buf + htbuf->offset, htbuf->len);
876 yaz_log(YLOG_WARN|YLOG_ERRNO, "write");
877 http_destroy(hc->iochan);
880 if (res == htbuf->len)
882 struct http_buf *np = htbuf->next;
883 http_buf_destroy(htbuf);
889 htbuf->offset += res;
893 iochan_setflags(pi, EVENT_INPUT); // Turns off output flag
897 yaz_log(YLOG_WARN, "Unexpected event on connection");
898 http_destroy(hc->iochan);
903 static void http_destroy(IOCHAN i)
905 struct http_channel *s = iochan_getdata(i);
909 if (s->proxy->iochan)
911 close(iochan_getfd(s->proxy->iochan));
912 iochan_destroy(s->proxy->iochan);
914 http_buf_destroy_queue(s->proxy->oqueue);
917 s->next = http_channel_freelist;
918 http_channel_freelist = s;
919 close(iochan_getfd(i));
923 static struct http_channel *http_create(const char *addr)
925 struct http_channel *r = http_channel_freelist;
929 http_channel_freelist = r->next;
931 wrbuf_rewind(r->wrbuf);
935 r = xmalloc(sizeof(struct http_channel));
936 r->nmem = nmem_create();
937 r->wrbuf = wrbuf_alloc();
941 r->iqueue = r->oqueue = 0;
942 r->state = Http_Idle;
947 yaz_log(YLOG_WARN, "Invalid HTTP forward address");
950 r->addr = nmem_strdup(r->nmem, addr);
955 /* Accept a new command connection */
956 static void http_accept(IOCHAN i, int event)
958 struct sockaddr_in addr;
959 int fd = iochan_getfd(i);
964 struct http_channel *ch;
967 if ((s = accept(fd, (struct sockaddr *) &addr, &len)) < 0)
969 yaz_log(YLOG_WARN|YLOG_ERRNO, "accept");
972 if ((flags = fcntl(s, F_GETFL, 0)) < 0)
973 yaz_log(YLOG_FATAL|YLOG_ERRNO, "fcntl");
974 if (fcntl(s, F_SETFL, flags | O_NONBLOCK) < 0)
975 yaz_log(YLOG_FATAL|YLOG_ERRNO, "fcntl2");
977 yaz_log(YLOG_DEBUG, "New command connection");
978 c = iochan_create(s, http_io, EVENT_INPUT | EVENT_EXCEPT);
980 ch = http_create(inet_ntoa(addr.sin_addr));
982 iochan_setdata(c, ch);
984 c->next = channel_list;
988 /* Create a http-channel listener, syntax [host:]port */
989 void http_init(const char *addr)
994 struct sockaddr_in myaddr;
999 yaz_log(YLOG_LOG, "HTTP listener %s", addr);
1001 memset(&myaddr, 0, sizeof myaddr);
1002 myaddr.sin_family = AF_INET;
1003 pp = strchr(addr, ':');
1006 int len = pp - addr;
1010 strncpy(hostname, addr, len);
1011 hostname[len] = '\0';
1012 if (!(he = gethostbyname(hostname)))
1014 yaz_log(YLOG_FATAL, "Unable to resolve '%s'", hostname);
1018 memcpy(&myaddr.sin_addr.s_addr, he->h_addr_list[0], he->h_length);
1019 port = atoi(pp + 1);
1021 yaz_log(YLOG_LOG, "HTTP address %s:%d",
1022 "" == he->h_addr_list[0] ? he->h_addr_list[0] : "127.0.0.1" ,
1031 myaddr.sin_addr.s_addr = INADDR_ANY;
1034 // get hostname from system - after deciding to bind to any
1035 // IP address this box might have.
1036 if (0 == gethostname(h, len)){
1038 global_parameters.server->host = nmem_strdup(nmem, h);
1040 yaz_log(YLOG_WARN, "Could not get host name");
1045 myaddr.sin_port = htons(port);
1048 if (!(p = getprotobyname("tcp"))) {
1051 if ((l = socket(PF_INET, SOCK_STREAM, p->p_proto)) < 0)
1052 yaz_log(YLOG_FATAL|YLOG_ERRNO, "socket");
1053 if (setsockopt(l, SOL_SOCKET, SO_REUSEADDR, (char*)
1054 &one, sizeof(one)) < 0)
1057 if (bind(l, (struct sockaddr *) &myaddr, sizeof myaddr) < 0)
1058 yaz_log(YLOG_FATAL|YLOG_ERRNO, "bind");
1059 if (listen(l, SOMAXCONN) < 0)
1060 yaz_log(YLOG_FATAL|YLOG_ERRNO, "listen");
1062 c = iochan_create(l, http_accept, EVENT_INPUT | EVENT_EXCEPT);
1063 c->next = channel_list;
1067 void http_set_proxyaddr(char *host, char *base_url)
1073 strcpy(myurl, base_url);
1074 strcpy(proxy_url, host);
1075 p = strchr(host, ':');
1076 yaz_log(YLOG_DEBUG, "Proxying for %s", host);
1077 yaz_log(YLOG_LOG, "HTTP backend %s", proxy_url);
1084 if (!(he = gethostbyname(host)))
1086 fprintf(stderr, "Failed to lookup '%s'\n", host);
1089 proxy_addr = xmalloc(sizeof(struct sockaddr_in));
1090 proxy_addr->sin_family = he->h_addrtype;
1091 memcpy(&proxy_addr->sin_addr.s_addr, he->h_addr_list[0], he->h_length);
1092 proxy_addr->sin_port = htons(port);
1098 * indent-tabs-mode: nil
1100 * vim: shiftwidth=4 tabstop=8 expandtab