src/http.c

   1 /* This file is part of Pazpar2.
   2    Copyright (C) Index Data
   3
   4 Pazpar2 is free software; you can redistribute it and/or modify it under
   5 the terms of the GNU General Public License as published by the Free
   6 Software Foundation; either version 2, or (at your option) any later
   7 version.
   8
   9 Pazpar2 is distributed in the hope that it will be useful, but WITHOUT ANY
  10 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12 for more details.
  13
  14 You should have received a copy of the GNU General Public License
  15 along with this program; if not, write to the Free Software
  16 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17
  18 */
  19
  20 #if HAVE_CONFIG_H
  21 #include <config.h>
  22 #endif
  23
  24 #if HAVE_SYS_TIME_H
  25 #include <sys/time.h>
  26 #endif
  27
  28 #include <stdio.h>
  29 #ifdef WIN32
  30 #include <winsock2.h>
  31 #include <ws2tcpip.h>
  32 typedef int socklen_t;
  33 #endif
  34
  35 #if HAVE_SYS_SOCKET_H
  36 #include <sys/socket.h>
  37 #endif
  38
  39 #include <sys/types.h>
  40
  41 #include <yaz/snprintf.h>
  42 #if HAVE_UNISTD_H
  43 #include <unistd.h>
  44 #endif
  45
  46 #include <stdlib.h>
  47 #include <string.h>
  48 #include <ctype.h>
  49 #include <fcntl.h>
  50 #if HAVE_NETDB_H
  51 #include <netdb.h>
  52 #endif
  53
  54 #include <errno.h>
  55 #include <assert.h>
  56 #include <string.h>
  57
  58 #include <yaz/yaz-util.h>
  59 #include <yaz/comstack.h>
  60 #include <yaz/nmem.h>
  61 #include <yaz/mutex.h>
  62
  63 #include "ppmutex.h"
  64 #include "session.h"
  65 #include "http.h"
  66 #include "parameters.h"
  67
  68 #define MAX_HTTP_HEADER 4096
  69
  70 #ifdef WIN32
  71 #define strncasecmp _strnicmp
  72 #define strcasecmp _stricmp
  73 #endif
  74
  75 struct http_buf
  76 {
  77 #define HTTP_BUF_SIZE 4096
  78     char buf[4096];
  79     int offset;
  80     int len;
  81     struct http_buf *next;
  82 };
  83
  84 static int log_level_post = 0;
  85
  86 static void proxy_io(IOCHAN i, int event);
  87 static struct http_channel *http_channel_create(http_server_t http_server,
  88                                                 const char *addr,
  89                                                 struct conf_server *server);
  90 static void http_channel_destroy(IOCHAN i);
  91 static http_server_t http_server_create(void);
  92 static void http_server_incref(http_server_t hs);
  93
  94 #ifdef WIN32
  95 #define CLOSESOCKET(x) closesocket(x)
  96 #else
  97 #define CLOSESOCKET(x) close(x)
  98 #endif
  99
 100 struct http_server
 101 {
 102     YAZ_MUTEX mutex;
 103     int listener_socket;
 104     int ref_count;
 105     http_sessions_t http_sessions;
 106     struct sockaddr_in *proxy_addr;
 107     FILE *record_file;
 108 };
 109
 110 struct http_channel_observer_s {
 111     void *data;
 112     void *data2;
 113     http_channel_destroy_t destroy;
 114     struct http_channel_observer_s *next;
 115     struct http_channel *chan;
 116 };
 117
 118
 119 const char *http_lookup_header(struct http_header *header,
 120                                const char *name)
 121 {
 122     for (; header; header = header->next)
 123         if (!strcasecmp(name, header->name))
 124             return header->value;
 125     return 0;
 126 }
 127
 128 static struct http_buf *http_buf_create(http_server_t hs)
 129 {
 130     struct http_buf *r = xmalloc(sizeof(*r));
 131     r->offset = 0;
 132     r->len = 0;
 133     r->next = 0;
 134     return r;
 135 }
 136
 137 static void http_buf_destroy(http_server_t hs, struct http_buf *b)
 138 {
 139     xfree(b);
 140 }
 141
 142 static void http_buf_destroy_queue(http_server_t hs, struct http_buf *b)
 143 {
 144     struct http_buf *p;
 145     while (b)
 146     {
 147         p = b->next;
 148         http_buf_destroy(hs, b);
 149         b = p;
 150     }
 151 }
 152
 153 static struct http_buf *http_buf_bybuf(http_server_t hs, char *b, int len)
 154 {
 155     struct http_buf *res = 0;
 156     struct http_buf **p = &res;
 157
 158     while (len)
 159     {
 160         int tocopy = len;
 161         if (tocopy > HTTP_BUF_SIZE)
 162             tocopy = HTTP_BUF_SIZE;
 163         *p = http_buf_create(hs);
 164         memcpy((*p)->buf, b, tocopy);
 165         (*p)->len = tocopy;
 166         len -= tocopy;
 167         b += tocopy;
 168         p = &(*p)->next;
 169     }
 170     return res;
 171 }
 172
 173 // Add a (chain of) buffers to the end of an existing queue.
 174 static void http_buf_enqueue(struct http_buf **queue, struct http_buf *b)
 175 {
 176     while (*queue)
 177         queue = &(*queue)->next;
 178     *queue = b;
 179 }
 180
 181 static struct http_buf *http_buf_bywrbuf(http_server_t hs, WRBUF wrbuf)
 182 {
 183     // Heavens to Betsy (buf)!
 184     return http_buf_bybuf(hs, wrbuf_buf(wrbuf), wrbuf_len(wrbuf));
 185 }
 186
 187 // Non-destructively collapse chain of buffers into a string (max *len)
 188 // Return
 189 static void http_buf_peek(struct http_buf *b, char *buf, int len)
 190 {
 191     int rd = 0;
 192     while (b && rd < len)
 193     {
 194         int toread = len - rd;
 195         if (toread > b->len)
 196             toread = b->len;
 197         memcpy(buf + rd, b->buf + b->offset, toread);
 198         rd += toread;
 199         b = b->next;
 200     }
 201     buf[rd] = '\0';
 202 }
 203
 204 static int http_buf_size(struct http_buf *b)
 205 {
 206     int sz = 0;
 207     for (; b; b = b->next)
 208         sz += b->len;
 209     return sz;
 210 }
 211
 212 // Ddestructively munch up to len  from head of queue.
 213 static int http_buf_read(http_server_t hs,
 214                          struct http_buf **b, char *buf, int len)
 215 {
 216     int rd = 0;
 217     while ((*b) && rd < len)
 218     {
 219         int toread = len - rd;
 220         if (toread > (*b)->len)
 221             toread = (*b)->len;
 222         memcpy(buf + rd, (*b)->buf + (*b)->offset, toread);
 223         rd += toread;
 224         if (toread < (*b)->len)
 225         {
 226             (*b)->len -= toread;
 227             (*b)->offset += toread;
 228             break;
 229         }
 230         else
 231         {
 232             struct http_buf *n = (*b)->next;
 233             http_buf_destroy(hs, *b);
 234             *b = n;
 235         }
 236     }
 237     buf[rd] = '\0';
 238     return rd;
 239 }
 240
 241 // Buffers may overlap.
 242 static void urldecode(char *i, char *o)
 243 {
 244     while (*i)
 245     {
 246         if (*i == '+')
 247         {
 248             *(o++) = ' ';
 249             i++;
 250         }
 251         else if (*i == '%' && i[1] && i[2])
 252         {
 253             int v;
 254             i++;
 255             sscanf(i, "%2x", &v);
 256             *o++ = v;
 257             i += 2;
 258         }
 259         else
 260             *(o++) = *(i++);
 261     }
 262     *o = '\0';
 263 }
 264
 265 // Warning: Buffers may not overlap
 266 void urlencode(const char *i, char *o)
 267 {
 268     while (*i)
 269     {
 270         if (strchr(" /:", *i))
 271         {
 272             sprintf(o, "%%%.2X", (int) *i);
 273             o += 3;
 274         }
 275         else
 276             *(o++) = *i;
 277         i++;
 278     }
 279     *o = '\0';
 280 }
 281
 282 void http_addheader(struct http_response *r, const char *name, const char *value)
 283 {
 284     struct http_channel *c = r->channel;
 285     struct http_header *h = nmem_malloc(c->nmem, sizeof *h);
 286     h->name = nmem_strdup(c->nmem, name);
 287     h->value = nmem_strdup(c->nmem, value);
 288     h->next = r->headers;
 289     r->headers = h;
 290 }
 291
 292 const char *http_argbyname(struct http_request *r, const char *name)
 293 {
 294     struct http_argument *p;
 295     if (!name)
 296         return 0;
 297     for (p = r->arguments; p; p = p->next)
 298         if (!strcmp(p->name, name))
 299             return p->value;
 300     return 0;
 301 }
 302
 303 const char *http_headerbyname(struct http_header *h, const char *name)
 304 {
 305     for (; h; h = h->next)
 306         if (!strcmp(h->name, name))
 307             return h->value;
 308     return 0;
 309 }
 310
 311 struct http_response *http_create_response(struct http_channel *c)
 312 {
 313     struct http_response *r = nmem_malloc(c->nmem, sizeof(*r));
 314     strcpy(r->code, "200");
 315     r->msg = "OK";
 316     r->channel = c;
 317     r->headers = 0;
 318     r->payload = 0;
 319     r->content_type = "text/xml";
 320     return r;
 321 }
 322
 323
 324 static const char *next_crlf(const char *cp, size_t *skipped)
 325 {
 326     const char *next_cp = strchr(cp, '\n');
 327     if (next_cp)
 328     {
 329         if (next_cp > cp && next_cp[-1] == '\r')
 330             *skipped = next_cp - cp - 1;
 331         else
 332             *skipped = next_cp - cp;
 333         next_cp++;
 334     }
 335     return next_cp;
 336 }
 337
 338 // Check if buf contains a package (minus payload)
 339 static int package_check(const char *buf, int sz)
 340 {
 341     int content_len = 0;
 342     int len = 0;
 343
 344     while (*buf)
 345     {
 346         size_t skipped = 0;
 347         const char *b = next_crlf(buf, &skipped);
 348
 349         if (!b)
 350         {
 351             // we did not find CRLF.. See if buffer is too large..
 352             if (sz >= MAX_HTTP_HEADER-1)
 353                 return MAX_HTTP_HEADER-1; // yes. Return that (will fail later)
 354             break;
 355         }
 356         len += (b - buf);
 357         if (skipped == 0)
 358         {
 359             // CRLF CRLF , i.e. end of header
 360             if (len + content_len <= sz)
 361                 return len + content_len;
 362             break;
 363         }
 364         buf = b;
 365         // following first skip of \r\n so that we don't consider Method
 366         if (!strncasecmp(buf, "Content-Length:", 15))
 367         {
 368             const char *cp = buf+15;
 369             while (*cp == ' ')
 370                 cp++;
 371             content_len = 0;
 372             while (*cp && isdigit(*(const unsigned char *)cp))
 373                 content_len = content_len*10 + (*cp++ - '0');
 374             if (content_len < 0) /* prevent negative offsets */
 375                 content_len = 0;
 376         }
 377     }
 378     return 0;     // incomplete request
 379 }
 380
 381 // Check if we have a request. Return 0 or length
 382 static int request_check(struct http_buf *queue)
 383 {
 384     char tmp[MAX_HTTP_HEADER];
 385
 386     // only peek at the header..
 387     http_buf_peek(queue, tmp, MAX_HTTP_HEADER-1);
 388     // still we only return non-zero if the complete request is received..
 389     return package_check(tmp, http_buf_size(queue));
 390 }
 391
 392 struct http_response *http_parse_response_buf(struct http_channel *c, const char *buf, int len)
 393 {
 394     char tmp[MAX_HTTP_HEADER];
 395     struct http_response *r = http_create_response(c);
 396     char *p, *p2;
 397     struct http_header **hp = &r->headers;
 398
 399     if (len >= MAX_HTTP_HEADER)
 400         return 0;
 401     memcpy(tmp, buf, len);
 402     for (p = tmp; *p && *p != ' '; p++) // Skip HTTP version
 403         ;
 404     p++;
 405     // Response code
 406     for (p2 = p; *p2 && *p2 != ' ' && p2 - p < 3; p2++)
 407         r->code[p2 - p] = *p2;
 408     if (!(p = strstr(tmp, "\r\n")))
 409         return 0;
 410     p += 2;
 411     while (*p)
 412     {
 413         if (!(p2 = strstr(p, "\r\n")))
 414             return 0;
 415         if (p == p2) // End of headers
 416             break;
 417         else
 418         {
 419             struct http_header *h = *hp = nmem_malloc(c->nmem, sizeof(*h));
 420             char *value = strchr(p, ':');
 421             if (!value)
 422                 return 0;
 423             *(value++) = '\0';
 424             h->name = nmem_strdup(c->nmem, p);
 425             while (isspace(*(const unsigned char *) value))
 426                 value++;
 427             if (value >= p2)  // Empty header;
 428             {
 429                 h->value = "";
 430                 p = p2 + 2;
 431                 continue;
 432             }
 433             *p2 = '\0';
 434             h->value = nmem_strdup(c->nmem, value);
 435             h->next = 0;
 436             hp = &h->next;
 437             p = p2 + 2;
 438         }
 439     }
 440     return r;
 441 }
 442
 443 static int http_parse_arguments(struct http_request *r, NMEM nmem,
 444                                 const char *args)
 445 {
 446     const char *p2 = args;
 447
 448     while (*p2)
 449     {
 450         struct http_argument *a;
 451         const char *equal = strchr(p2, '=');
 452         const char *eoa = strchr(p2, '&');
 453         if (!equal)
 454         {
 455             yaz_log(YLOG_WARN, "Expected '=' in argument");
 456             return -1;
 457         }
 458         if (!eoa)
 459             eoa = equal + strlen(equal); // last argument
 460         else if (equal > eoa)
 461         {
 462             yaz_log(YLOG_WARN, "Missing '&' in argument");
 463             return -1;
 464         }
 465         a = nmem_malloc(nmem, sizeof(struct http_argument));
 466         a->name = nmem_strdupn(nmem, p2, equal - p2);
 467         a->value = nmem_strdupn(nmem, equal+1, eoa - equal - 1);
 468         urldecode(a->name, a->name);
 469         urldecode(a->value, a->value);
 470         a->next = r->arguments;
 471         r->arguments = a;
 472         p2 = eoa;
 473         while (*p2 == '&')
 474             p2++;
 475     }
 476     return 0;
 477 }
 478
 479 struct http_request *http_parse_request(struct http_channel *c,
 480                                         struct http_buf **queue,
 481                                         int len)
 482 {
 483     struct http_request *r = nmem_malloc(c->nmem, sizeof(*r));
 484     char *p, *p2;
 485     char *start = nmem_malloc(c->nmem, len+1);
 486     char *buf = start;
 487
 488     if (http_buf_read(c->http_server, queue, buf, len) < len)
 489     {
 490         yaz_log(YLOG_WARN, "http_buf_read < len (%d)", len);
 491         return 0;
 492     }
 493     r->search = "";
 494     r->channel = c;
 495     r->arguments = 0;
 496     r->headers = 0;
 497     r->content_buf = 0;
 498     r->content_len = 0;
 499     // Parse first line
 500     for (p = buf, p2 = r->method; *p && *p != ' ' && p - buf < 19; p++)
 501         *(p2++) = *p;
 502     if (*p != ' ')
 503     {
 504         yaz_log(YLOG_WARN, "Unexpected HTTP method in request");
 505         return 0;
 506     }
 507     *p2 = '\0';
 508
 509     if (!(buf = strchr(buf, ' ')))
 510     {
 511         yaz_log(YLOG_WARN, "Missing Request-URI in HTTP request");
 512         return 0;
 513     }
 514     buf++;
 515     if (!(p = strchr(buf, ' ')))
 516     {
 517         yaz_log(YLOG_WARN, "HTTP Request-URI not terminated (too long?)");
 518         return 0;
 519     }
 520     *(p++) = '\0';
 521     if ((p2 = strchr(buf, '?'))) // Do we have arguments?
 522         *(p2++) = '\0';
 523     r->path = nmem_strdup(c->nmem, buf);
 524     if (p2)
 525     {
 526         r->search = nmem_strdup(c->nmem, p2);
 527         // Parse Arguments
 528         http_parse_arguments(r, c->nmem, p2);
 529     }
 530     buf = p;
 531
 532     if (strncmp(buf, "HTTP/", 5))
 533         strcpy(r->http_version, "1.0");
 534     else
 535     {
 536         size_t skipped;
 537         buf += 5; // strlen("HTTP/")
 538
 539         p = (char*) next_crlf(buf, &skipped);
 540         if (!p || skipped < 3 || skipped > 5)
 541             return 0;
 542
 543         memcpy(r->http_version, buf, skipped);
 544         r->http_version[skipped] = '\0';
 545         buf = p;
 546     }
 547     strcpy(c->version, r->http_version);
 548
 549     r->headers = 0;
 550     while (*buf)
 551     {
 552         size_t skipped;
 553
 554         p = (char *) next_crlf(buf, &skipped);
 555         if (!p)
 556         {
 557             return 0;
 558         }
 559         else if (skipped == 0)
 560         {
 561             buf = p;
 562             break;
 563         }
 564         else
 565         {
 566             char *cp;
 567             char *n_v = nmem_malloc(c->nmem, skipped+1);
 568             struct http_header *h = nmem_malloc(c->nmem, sizeof(*h));
 569
 570             memcpy(n_v, buf, skipped);
 571             n_v[skipped] = '\0';
 572
 573             if (!(cp = strchr(n_v, ':')))
 574                 return 0;
 575             h->name = nmem_strdupn(c->nmem, n_v, cp - n_v);
 576             cp++;
 577             while (isspace(*cp))
 578                 cp++;
 579             h->value = nmem_strdup(c->nmem, cp);
 580             h->next = r->headers;
 581             r->headers = h;
 582             buf = p;
 583         }
 584     }
 585
 586     // determine if we do keep alive
 587     if (!strcmp(c->version, "1.0"))
 588     {
 589         const char *v = http_lookup_header(r->headers, "Connection");
 590         if (v && !strcmp(v, "Keep-Alive"))
 591             c->keep_alive = 1;
 592         else
 593             c->keep_alive = 0;
 594     }
 595     else
 596     {
 597         const char *v = http_lookup_header(r->headers, "Connection");
 598         if (v && !strcmp(v, "close"))
 599             c->keep_alive = 0;
 600         else
 601             c->keep_alive = 1;
 602     }
 603     if (buf < start + len)
 604     {
 605         const char *content_type = http_lookup_header(r->headers,
 606                                                       "Content-Type");
 607         r->content_len = start + len - buf;
 608         r->content_buf = buf;
 609
 610         if (content_type &&
 611             !yaz_strcmp_del("application/x-www-form-urlencoded",
 612                             content_type, "; "))
 613         {
 614             http_parse_arguments(r, c->nmem, r->content_buf);
 615         }
 616     }
 617     return r;
 618 }
 619
 620 static struct http_buf *http_serialize_response(struct http_channel *c,
 621         struct http_response *r)
 622 {
 623     struct http_header *h;
 624
 625     wrbuf_rewind(c->wrbuf);
 626
 627     wrbuf_printf(c->wrbuf, "HTTP/%s %s %s\r\n", c->version, r->code, r->msg);
 628     for (h = r->headers; h; h = h->next)
 629         wrbuf_printf(c->wrbuf, "%s: %s\r\n", h->name, h->value);
 630     if (r->payload)
 631     {
 632         wrbuf_printf(c->wrbuf, "Content-Length: %d\r\n", r->payload ?
 633                 (int) strlen(r->payload) : 0);
 634         wrbuf_printf(c->wrbuf, "Content-Type: %s\r\n", r->content_type);
 635         if (!strcmp(r->content_type, "text/xml"))
 636         {
 637             xmlDoc *doc = xmlParseMemory(r->payload, strlen(r->payload));
 638             if (doc)
 639             {
 640                 xmlFreeDoc(doc);
 641             }
 642             else
 643             {
 644                 yaz_log(YLOG_WARN, "Sending non-wellformed "
 645                         "response (bug #1162");
 646                 yaz_log(YLOG_WARN, "payload: %s", r->payload);
 647             }
 648         }
 649     }
 650     wrbuf_puts(c->wrbuf, "\r\n");
 651
 652     if (r->payload)
 653         wrbuf_puts(c->wrbuf, r->payload);
 654
 655     if (global_parameters.dump_records > 1)
 656     {
 657         FILE *lf = yaz_log_file();
 658         yaz_log(YLOG_LOG, "Response:");
 659         fwrite(wrbuf_buf(c->wrbuf), 1, wrbuf_len(c->wrbuf), lf);
 660         fputc('\n', lf);
 661     }
 662     return http_buf_bywrbuf(c->http_server, c->wrbuf);
 663 }
 664
 665 // Serialize a HTTP request
 666 static struct http_buf *http_serialize_request(struct http_request *r)
 667 {
 668     struct http_channel *c = r->channel;
 669     struct http_header *h;
 670
 671     wrbuf_rewind(c->wrbuf);
 672     wrbuf_printf(c->wrbuf, "%s %s%s%s", r->method, r->path,
 673                  *r->search ? "?" : "", r->search);
 674
 675     wrbuf_printf(c->wrbuf, " HTTP/%s\r\n", r->http_version);
 676
 677     for (h = r->headers; h; h = h->next)
 678         wrbuf_printf(c->wrbuf, "%s: %s\r\n", h->name, h->value);
 679
 680     wrbuf_puts(c->wrbuf, "\r\n");
 681
 682     if (r->content_buf)
 683         wrbuf_write(c->wrbuf, r->content_buf, r->content_len);
 684
 685 #if 0
 686     yaz_log(YLOG_LOG, "WRITING TO PROXY:\n%s\n----",
 687             wrbuf_cstr(c->wrbuf));
 688 #endif
 689     return http_buf_bywrbuf(c->http_server, c->wrbuf);
 690 }
 691
 692
 693 static int http_weshouldproxy(struct http_request *rq)
 694 {
 695     struct http_channel *c = rq->channel;
 696     if (c->server->http_server->proxy_addr && !strstr(rq->path, "search.pz2"))
 697         return 1;
 698     return 0;
 699 }
 700
 701
 702 struct http_header * http_header_append(struct http_channel *ch,
 703                                         struct http_header * hp,
 704                                         const char *name,
 705                                         const char *value)
 706 {
 707     struct http_header *hpnew = 0;
 708
 709     if (!hp | !ch)
 710         return 0;
 711
 712     while (hp && hp->next)
 713         hp = hp->next;
 714
 715     if(name && strlen(name)&& value && strlen(value)){
 716         hpnew = nmem_malloc(ch->nmem, sizeof *hpnew);
 717         hpnew->name = nmem_strdup(ch->nmem, name);
 718         hpnew->value = nmem_strdup(ch->nmem, value);
 719
 720         hpnew->next = 0;
 721         hp->next = hpnew;
 722         hp = hp->next;
 723
 724         return hpnew;
 725     }
 726
 727     return hp;
 728 }
 729
 730
 731 static int is_inprogress(void)
 732 {
 733 #ifdef WIN32
 734     if (WSAGetLastError() == WSAEWOULDBLOCK)
 735         return 1;
 736 #else
 737     if (errno == EINPROGRESS)
 738         return 1;
 739 #endif
 740     return 0;
 741 }
 742
 743 static void enable_nonblock(int sock)
 744 {
 745     int flags;
 746 #ifdef WIN32
 747     flags = (flags & CS_FLAGS_BLOCKING) ? 0 : 1;
 748     if (ioctlsocket(sock, FIONBIO, &flags) < 0)
 749         yaz_log(YLOG_FATAL|YLOG_ERRNO, "ioctlsocket");
 750 #else
 751     if ((flags = fcntl(sock, F_GETFL, 0)) < 0)
 752         yaz_log(YLOG_FATAL|YLOG_ERRNO, "fcntl");
 753     if (fcntl(sock, F_SETFL, flags | O_NONBLOCK) < 0)
 754         yaz_log(YLOG_FATAL|YLOG_ERRNO, "fcntl2");
 755 #endif
 756 }
 757
 758 static int http_proxy(struct http_request *rq)
 759 {
 760     struct http_channel *c = rq->channel;
 761     struct http_proxy *p = c->proxy;
 762     struct http_header *hp;
 763     struct http_buf *requestbuf;
 764     struct conf_server *ser = c->server;
 765
 766     if (!p) // This is a new connection. Create a proxy channel
 767     {
 768         int sock;
 769         struct protoent *pe;
 770         int one = 1;
 771
 772         if (!(pe = getprotobyname("tcp"))) {
 773             abort();
 774         }
 775         if ((sock = socket(PF_INET, SOCK_STREAM, pe->p_proto)) < 0)
 776         {
 777             yaz_log(YLOG_WARN|YLOG_ERRNO, "socket");
 778             return -1;
 779         }
 780         if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (char*)
 781                         &one, sizeof(one)) < 0)
 782             abort();
 783         enable_nonblock(sock);
 784         if (connect(sock, (struct sockaddr *)
 785                     c->server->http_server->proxy_addr,
 786                     sizeof(*c->server->http_server->proxy_addr)) < 0)
 787         {
 788             if (!is_inprogress())
 789             {
 790                 yaz_log(YLOG_WARN|YLOG_ERRNO, "Proxy connect");
 791                 return -1;
 792             }
 793         }
 794         p = xmalloc(sizeof(struct http_proxy));
 795         p->oqueue = 0;
 796         p->channel = c;
 797         p->first_response = 1;
 798         c->proxy = p;
 799         // We will add EVENT_OUTPUT below
 800         p->iochan = iochan_create(sock, proxy_io, EVENT_INPUT, "http_proxy");
 801         iochan_setdata(p->iochan, p);
 802
 803         iochan_add(ser->iochan_man, p->iochan);
 804     }
 805
 806     // Do _not_ modify Host: header, just checking it's existence
 807
 808     if (!http_lookup_header(rq->headers, "Host"))
 809     {
 810         yaz_log(YLOG_WARN, "Failed to find Host header in proxy");
 811         return -1;
 812     }
 813
 814     // Add new header about paraz2 version, host, remote client address, etc.
 815     {
 816         char server_via[128];
 817
 818         hp = rq->headers;
 819         hp = http_header_append(c, hp,
 820                                 "X-Pazpar2-Version", PACKAGE_VERSION);
 821         hp = http_header_append(c, hp,
 822                                 "X-Pazpar2-Server-Host", ser->host);
 823         hp = http_header_append(c, hp,
 824                                 "X-Pazpar2-Server-Port", ser->port);
 825         yaz_snprintf(server_via, sizeof(server_via),
 826                      "1.1 %s:%s (%s/%s)",
 827                      ser->host, ser->port,
 828                      PACKAGE_NAME, PACKAGE_VERSION);
 829         hp = http_header_append(c, hp, "Via" , server_via);
 830         hp = http_header_append(c, hp, "X-Forwarded-For", c->addr);
 831     }
 832
 833     requestbuf = http_serialize_request(rq);
 834
 835     http_buf_enqueue(&p->oqueue, requestbuf);
 836     iochan_setflag(p->iochan, EVENT_OUTPUT);
 837     return 0;
 838 }
 839
 840 void http_send_response(struct http_channel *ch)
 841 {
 842     struct http_response *rs = ch->response;
 843     struct http_buf *hb;
 844
 845     yaz_timing_stop(ch->yt);
 846     if (ch->request)
 847     {
 848         yaz_log(YLOG_LOG, "Response: %6.5f %d %s%s%s ",
 849                 yaz_timing_get_real(ch->yt),
 850                 iochan_getfd(ch->iochan),
 851                 ch->request->path,
 852                 *ch->request->search ? "?" : "",
 853                 ch->request->search);
 854     }
 855     assert(rs);
 856     hb = http_serialize_response(ch, rs);
 857     if (!hb)
 858     {
 859         yaz_log(YLOG_WARN, "Failed to serialize HTTP response");
 860         http_channel_destroy(ch->iochan);
 861     }
 862     else
 863     {
 864         http_buf_enqueue(&ch->oqueue, hb);
 865         iochan_setflag(ch->iochan, EVENT_OUTPUT);
 866         ch->state = Http_Idle;
 867     }
 868 }
 869
 870 static void http_error(struct http_channel *hc, int no, const char *msg)
 871 {
 872     struct http_response *rs = http_create_response(hc);
 873
 874     hc->response = rs;
 875     hc->keep_alive = 0;  // not keeping this HTTP session alive
 876
 877     sprintf(rs->code, "%d", no);
 878
 879     rs->msg = nmem_strdup(hc->nmem, msg);
 880     rs->payload = nmem_malloc(hc->nmem, 100);
 881     yaz_snprintf(rs->payload, 99, "<error>HTTP Error %d: %s</error>\n",
 882                  no, msg);
 883     http_send_response(hc);
 884 }
 885
 886 static void http_io(IOCHAN i, int event)
 887 {
 888     struct http_channel *hc = iochan_getdata(i);
 889     while (event)
 890     {
 891         if (event == EVENT_INPUT)
 892         {
 893             int res, reqlen;
 894             struct http_buf *htbuf;
 895
 896             htbuf = http_buf_create(hc->http_server);
 897             res = recv(iochan_getfd(i), htbuf->buf, HTTP_BUF_SIZE -1, 0);
 898             if (res == -1 && errno == EAGAIN)
 899             {
 900                 http_buf_destroy(hc->http_server, htbuf);
 901                 return;
 902             }
 903             if (res <= 0)
 904             {
 905 #if HAVE_SYS_TIME_H
 906                 if (hc->http_server->record_file)
 907                 {
 908                     struct timeval tv;
 909                     gettimeofday(&tv, 0);
 910                     fprintf(hc->http_server->record_file, "r %lld %lld %lld 0\n",
 911                             (long long) tv.tv_sec, (long long) tv.tv_usec,
 912                             (long long) iochan_getfd(i));
 913                 }
 914 #endif
 915                 http_buf_destroy(hc->http_server, htbuf);
 916                 fflush(hc->http_server->record_file);
 917                 http_channel_destroy(i);
 918                 return;
 919             }
 920             htbuf->buf[res] = '\0';
 921             htbuf->len = res;
 922             http_buf_enqueue(&hc->iqueue, htbuf);
 923
 924             while (1)
 925             {
 926                 if (hc->state == Http_Busy)
 927                     return;
 928                 reqlen = request_check(hc->iqueue);
 929                 if (reqlen <= 2)
 930                     return;
 931                 // we have a complete HTTP request
 932                 nmem_reset(hc->nmem);
 933 #if HAVE_SYS_TIME_H
 934                 if (hc->http_server->record_file)
 935                 {
 936                     struct timeval tv;
 937                     int sz = 0;
 938                     struct http_buf *hb;
 939                     for (hb = hc->iqueue; hb; hb = hb->next)
 940                         sz += hb->len;
 941                     gettimeofday(&tv, 0);
 942                     fprintf(hc->http_server->record_file, "r %lld %lld %lld %d\n",
 943                             (long long) tv.tv_sec, (long long) tv.tv_usec,
 944                             (long long) iochan_getfd(i), sz);
 945                     for (hb = hc->iqueue; hb; hb = hb->next)
 946                         fwrite(hb->buf, 1, hb->len, hc->http_server->record_file);
 947                     fflush(hc->http_server->record_file);
 948                 }
 949  #endif
 950                 yaz_timing_start(hc->yt);
 951                 if (!(hc->request = http_parse_request(hc, &hc->iqueue, reqlen)))
 952                 {
 953                     yaz_log(YLOG_WARN, "Failed to parse request");
 954                     http_error(hc, 400, "Bad Request");
 955                     return;
 956                 }
 957                 hc->response = 0;
 958                 yaz_log(YLOG_LOG, "Request: - %d %s %s%s%s",
 959                         iochan_getfd(i),
 960                         hc->request->method,
 961                         hc->request->path,
 962                         *hc->request->search ? "?" : "",
 963                         hc->request->search);
 964                 if (hc->request->content_buf && log_level_post)
 965                     yaz_log(log_level_post, "%s", hc->request->content_buf);
 966                 if (http_weshouldproxy(hc->request))
 967                     http_proxy(hc->request);
 968                 else
 969                 {
 970                     // Execute our business logic!
 971                     hc->state = Http_Busy;
 972                     http_command(hc);
 973                 }
 974             }
 975         }
 976         else if (event == EVENT_OUTPUT)
 977         {
 978             event = 0;
 979             if (hc->oqueue)
 980             {
 981                 struct http_buf *wb = hc->oqueue;
 982                 int res;
 983                 res = send(iochan_getfd(hc->iochan),
 984                            wb->buf + wb->offset, wb->len, 0);
 985                 if (res <= 0)
 986                 {
 987                     yaz_log(YLOG_WARN|YLOG_ERRNO, "write");
 988                     http_channel_destroy(i);
 989                     return;
 990                 }
 991                 if (res == wb->len)
 992                 {
 993 #if HAVE_SYS_TIME_H
 994                     if (hc->http_server->record_file)
 995                     {
 996                         struct timeval tv;
 997                         int sz = wb->offset + wb->len;
 998                         gettimeofday(&tv, 0);
 999                         fprintf(hc->http_server->record_file, "w %lld %lld %lld %d\n",
1000                                 (long long) tv.tv_sec, (long long) tv.tv_usec,
1001                                 (long long) iochan_getfd(i), sz);
1002                         fwrite(wb->buf, 1, wb->offset + wb->len,
1003                                hc->http_server->record_file);
1004                         fputc('\n', hc->http_server->record_file);
1005                         fflush(hc->http_server->record_file);
1006                     }
1007  #endif
1008                     hc->oqueue = hc->oqueue->next;
1009                     http_buf_destroy(hc->http_server, wb);
1010                 }
1011                 else
1012                 {
1013                     wb->len -= res;
1014                     wb->offset += res;
1015                 }
1016                 if (!hc->oqueue)
1017                 {
1018                     if (!hc->keep_alive)
1019                     {
1020                         http_channel_destroy(i);
1021                         return;
1022                     }
1023                     else
1024                     {
1025                         iochan_clearflag(i, EVENT_OUTPUT);
1026                         if (hc->iqueue)
1027                             event = EVENT_INPUT;
1028                     }
1029                 }
1030             }
1031             if (!hc->oqueue && hc->proxy && !hc->proxy->iochan)
1032                 http_channel_destroy(i); // Server closed; we're done
1033         }
1034         else
1035         {
1036             yaz_log(YLOG_WARN, "Unexpected event on connection");
1037             http_channel_destroy(i);
1038             event = 0;
1039         }
1040     }
1041 }
1042
1043 // Handles I/O on a client connection to a backend web server (proxy mode)
1044 static void proxy_io(IOCHAN pi, int event)
1045 {
1046     struct http_proxy *pc = iochan_getdata(pi);
1047     struct http_channel *hc = pc->channel;
1048
1049     switch (event)
1050     {
1051         int res;
1052         struct http_buf *htbuf;
1053
1054         case EVENT_INPUT:
1055             htbuf = http_buf_create(hc->http_server);
1056             res = recv(iochan_getfd(pi), htbuf->buf, HTTP_BUF_SIZE -1, 0);
1057             if (res == 0 || (res < 0 && !is_inprogress()))
1058             {
1059                 if (hc->oqueue)
1060                 {
1061                     yaz_log(YLOG_WARN, "Proxy read came up short");
1062                     // Close channel and alert client HTTP channel that we're gone
1063                     http_buf_destroy(hc->http_server, htbuf);
1064                     CLOSESOCKET(iochan_getfd(pi));
1065                     iochan_destroy(pi);
1066                     pc->iochan = 0;
1067                 }
1068                 else
1069                 {
1070                     http_channel_destroy(hc->iochan);
1071                     return;
1072                 }
1073             }
1074             else
1075             {
1076                 htbuf->buf[res] = '\0';
1077                 htbuf->offset = 0;
1078                 htbuf->len = res;
1079                 // Write any remaining payload
1080                 if (htbuf->len - htbuf->offset > 0)
1081                     http_buf_enqueue(&hc->oqueue, htbuf);
1082             }
1083             iochan_setflag(hc->iochan, EVENT_OUTPUT);
1084             break;
1085         case EVENT_OUTPUT:
1086             if (!(htbuf = pc->oqueue))
1087             {
1088                 iochan_clearflag(pi, EVENT_OUTPUT);
1089                 return;
1090             }
1091             res = send(iochan_getfd(pi), htbuf->buf + htbuf->offset, htbuf->len, 0);
1092             if (res <= 0)
1093             {
1094                 yaz_log(YLOG_WARN|YLOG_ERRNO, "write");
1095                 http_channel_destroy(hc->iochan);
1096                 return;
1097             }
1098             if (res == htbuf->len)
1099             {
1100                 struct http_buf *np = htbuf->next;
1101                 http_buf_destroy(hc->http_server, htbuf);
1102                 pc->oqueue = np;
1103             }
1104             else
1105             {
1106                 htbuf->len -= res;
1107                 htbuf->offset += res;
1108             }
1109
1110             if (!pc->oqueue) {
1111                 iochan_setflags(pi, EVENT_INPUT); // Turns off output flag
1112             }
1113             break;
1114         default:
1115             yaz_log(YLOG_WARN, "Unexpected event on connection");
1116             http_channel_destroy(hc->iochan);
1117             break;
1118     }
1119 }
1120
1121 static void http_fire_observers(struct http_channel *c);
1122 static void http_destroy_observers(struct http_channel *c);
1123
1124 // Cleanup channel
1125 static void http_channel_destroy(IOCHAN i)
1126 {
1127     struct http_channel *s = iochan_getdata(i);
1128     http_server_t http_server;
1129
1130     if (s->proxy)
1131     {
1132         if (s->proxy->iochan)
1133         {
1134             CLOSESOCKET(iochan_getfd(s->proxy->iochan));
1135             iochan_destroy(s->proxy->iochan);
1136         }
1137         http_buf_destroy_queue(s->http_server, s->proxy->oqueue);
1138         xfree(s->proxy);
1139     }
1140     yaz_timing_destroy(&s->yt);
1141     http_buf_destroy_queue(s->http_server, s->iqueue);
1142     http_buf_destroy_queue(s->http_server, s->oqueue);
1143     http_fire_observers(s);
1144     http_destroy_observers(s);
1145
1146     http_server = s->http_server; /* save it for destroy (decref) */
1147
1148     http_server_destroy(http_server);
1149
1150     CLOSESOCKET(iochan_getfd(i));
1151
1152     iochan_destroy(i);
1153     nmem_destroy(s->nmem);
1154     wrbuf_destroy(s->wrbuf);
1155     xfree(s);
1156 }
1157
1158 static struct http_channel *http_channel_create(http_server_t hs,
1159                                                 const char *addr,
1160                                                 struct conf_server *server)
1161 {
1162     struct http_channel *r;
1163
1164     r = xmalloc(sizeof(struct http_channel));
1165     r->nmem = nmem_create();
1166     r->wrbuf = wrbuf_alloc();
1167
1168     http_server_incref(hs);
1169     r->http_server = hs;
1170     r->http_sessions = hs->http_sessions;
1171     assert(r->http_sessions);
1172     r->server = server;
1173     r->proxy = 0;
1174     r->iochan = 0;
1175     r->iqueue = r->oqueue = 0;
1176     r->state = Http_Idle;
1177     r->keep_alive = 0;
1178     r->request = 0;
1179     r->response = 0;
1180     strcpy(r->version, "1.0");
1181     if (!addr)
1182     {
1183         yaz_log(YLOG_WARN, "Invalid HTTP forward address");
1184         exit(1);
1185     }
1186     strcpy(r->addr, addr);
1187     r->observers = 0;
1188     r->yt = yaz_timing_create();
1189     return r;
1190 }
1191
1192
1193 /* Accept a new command connection */
1194 static void http_accept(IOCHAN i, int event)
1195 {
1196     char host[256];
1197     struct sockaddr_storage addr;
1198     int fd = iochan_getfd(i);
1199     socklen_t len = sizeof addr;
1200     int s;
1201     IOCHAN c;
1202     struct http_channel *ch;
1203     struct conf_server *server = iochan_getdata(i);
1204
1205     if ((s = accept(fd, (struct sockaddr *) &addr, &len)) < 0)
1206     {
1207         yaz_log(YLOG_WARN|YLOG_ERRNO, "accept");
1208         return;
1209     }
1210     if (getnameinfo((struct sockaddr *) &addr, len, host, sizeof(host)-1, 0, 0,
1211         NI_NUMERICHOST))
1212     {
1213         yaz_log(YLOG_WARN|YLOG_ERRNO, "getnameinfo");
1214         CLOSESOCKET(s);
1215         return;
1216     }
1217     enable_nonblock(s);
1218
1219     yaz_log(YLOG_DEBUG, "New command connection");
1220     c = iochan_create(s, http_io, EVENT_INPUT | EVENT_EXCEPT,
1221                       "http_session_socket");
1222
1223
1224     ch = http_channel_create(server->http_server, host, server);
1225     ch->iochan = c;
1226     iochan_setdata(c, ch);
1227     iochan_add(server->iochan_man, c);
1228 }
1229
1230 /* Create a http-channel listener, syntax [host:]port */
1231 int http_init(struct conf_server *server, const char *record_fname)
1232 {
1233     IOCHAN c;
1234     int s = -1;
1235     int one = 1;
1236     FILE *record_file = 0;
1237     struct addrinfo hints, *af = 0, *ai;
1238     int error;
1239     int ipv6_only = -1;
1240
1241     yaz_log(YLOG_LOG, "HTTP listener %s:%s", server->host, server->port);
1242
1243     hints.ai_flags = 0;
1244     hints.ai_family = AF_UNSPEC;
1245     hints.ai_socktype = SOCK_STREAM;
1246     hints.ai_protocol = 0;
1247     hints.ai_addrlen        = 0;
1248     hints.ai_addr           = NULL;
1249     hints.ai_canonname      = NULL;
1250     hints.ai_next           = NULL;
1251
1252     if (!strcmp(server->host, "@"))
1253     {
1254         ipv6_only = 0;
1255         hints.ai_flags = AI_PASSIVE;
1256         error = getaddrinfo(0, server->port, &hints, &af);
1257     }
1258     else
1259         error = getaddrinfo(server->host, server->port, &hints, &af);
1260
1261     if (error)
1262     {
1263         yaz_log(YLOG_FATAL, "Failed to resolve %s: %s", server->host,
1264                 gai_strerror(error));
1265         return 1;
1266     }
1267     for (ai = af; ai; ai = ai->ai_next)
1268     {
1269         if (ai->ai_family == AF_INET6)
1270         {
1271             s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
1272             if (s != -1)
1273                 break;
1274         }
1275     }
1276     if (s == -1)
1277     {
1278         for (ai = af; ai; ai = ai->ai_next)
1279         {
1280             s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
1281             if (s != -1)
1282                 break;
1283         }
1284     }
1285     if (s == -1)
1286     {
1287         yaz_log(YLOG_FATAL|YLOG_ERRNO, "socket");
1288         freeaddrinfo(af);
1289         return 1;
1290     }
1291     if (ipv6_only >= 0 && ai->ai_family == AF_INET6 &&
1292         setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &ipv6_only, sizeof(ipv6_only)))
1293     {
1294         yaz_log(YLOG_FATAL|YLOG_ERRNO, "setsockopt IPV6_V6ONLY %s:%s %d",
1295                 server->host, server->port, ipv6_only);
1296         freeaddrinfo(af);
1297         CLOSESOCKET(s);
1298         return 1;
1299     }
1300     if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)))
1301     {
1302         yaz_log(YLOG_FATAL|YLOG_ERRNO, "setsockopt SO_REUSEADDR %s:%s",
1303                 server->host, server->port);
1304         freeaddrinfo(af);
1305         CLOSESOCKET(s);
1306         return 1;
1307     }
1308     if (bind(s, ai->ai_addr, ai->ai_addrlen) < 0)
1309     {
1310         yaz_log(YLOG_FATAL|YLOG_ERRNO, "bind %s:%s",
1311                 server->host, server->port);
1312         freeaddrinfo(af);
1313         CLOSESOCKET(s);
1314         return 1;
1315     }
1316     freeaddrinfo(af);
1317     if (listen(s, SOMAXCONN) < 0)
1318     {
1319         yaz_log(YLOG_FATAL|YLOG_ERRNO, "listen %s:%s",
1320                 server->host, server->port);
1321         CLOSESOCKET(s);
1322         return 1;
1323     }
1324
1325     if (record_fname)
1326     {
1327         record_file = fopen(record_fname, "wb");
1328         if (!record_file)
1329         {
1330             yaz_log(YLOG_FATAL|YLOG_ERRNO, "fopen %s", record_fname);
1331             CLOSESOCKET(s);
1332             return 1;
1333         }
1334     }
1335     server->http_server = http_server_create();
1336
1337     server->http_server->record_file = record_file;
1338     server->http_server->listener_socket = s;
1339
1340     c = iochan_create(s, http_accept, EVENT_INPUT | EVENT_EXCEPT, "http_server");
1341     iochan_setdata(c, server);
1342
1343     iochan_add(server->iochan_man, c);
1344     return 0;
1345 }
1346
1347 void http_close_server(struct conf_server *server)
1348 {
1349     /* break the event_loop (select) by closing down the HTTP listener sock */
1350     if (server->http_server->listener_socket)
1351     {
1352 #ifdef WIN32
1353         closesocket(server->http_server->listener_socket);
1354 #else
1355         close(server->http_server->listener_socket);
1356 #endif
1357     }
1358 }
1359
1360 void http_set_proxyaddr(const char *host, struct conf_server *server)
1361 {
1362     const char *p;
1363     short port;
1364     struct hostent *he;
1365     WRBUF w = wrbuf_alloc();
1366
1367     yaz_log(YLOG_LOG, "HTTP backend  %s", host);
1368
1369     p = strchr(host, ':');
1370     if (p)
1371     {
1372         port = atoi(p + 1);
1373         wrbuf_write(w, host, p - host);
1374         wrbuf_puts(w, "");
1375     }
1376     else
1377     {
1378         port = 80;
1379         wrbuf_puts(w, host);
1380     }
1381     if (!(he = gethostbyname(wrbuf_cstr(w))))
1382     {
1383         fprintf(stderr, "Failed to lookup '%s'\n", wrbuf_cstr(w));
1384         exit(1);
1385     }
1386     wrbuf_destroy(w);
1387
1388     server->http_server->proxy_addr = xmalloc(sizeof(struct sockaddr_in));
1389     server->http_server->proxy_addr->sin_family = he->h_addrtype;
1390     memcpy(&server->http_server->proxy_addr->sin_addr.s_addr,
1391            he->h_addr_list[0], he->h_length);
1392     server->http_server->proxy_addr->sin_port = htons(port);
1393 }
1394
1395 static void http_fire_observers(struct http_channel *c)
1396 {
1397     http_channel_observer_t p = c->observers;
1398     while (p)
1399     {
1400         p->destroy(p->data, c, p->data2);
1401         p = p->next;
1402     }
1403 }
1404
1405 static void http_destroy_observers(struct http_channel *c)
1406 {
1407     while (c->observers)
1408     {
1409         http_channel_observer_t obs = c->observers;
1410         c->observers = obs->next;
1411         xfree(obs);
1412     }
1413 }
1414
1415 http_channel_observer_t http_add_observer(struct http_channel *c, void *data,
1416                                           http_channel_destroy_t des)
1417 {
1418     http_channel_observer_t obs = xmalloc(sizeof(*obs));
1419     obs->chan = c;
1420     obs->data = data;
1421     obs->data2 = 0;
1422     obs->destroy= des;
1423     obs->next = c->observers;
1424     c->observers = obs;
1425     return obs;
1426 }
1427
1428 void http_remove_observer(http_channel_observer_t obs)
1429 {
1430     struct http_channel *c = obs->chan;
1431     http_channel_observer_t found, *p = &c->observers;
1432     while (*p != obs)
1433         p = &(*p)->next;
1434     found = *p;
1435     assert(found);
1436     *p = (*p)->next;
1437     xfree(found);
1438 }
1439
1440 struct http_channel *http_channel_observer_chan(http_channel_observer_t obs)
1441 {
1442     return obs->chan;
1443 }
1444
1445 void http_observer_set_data2(http_channel_observer_t obs, void *data2)
1446 {
1447     obs->data2 = data2;
1448 }
1449
1450 http_server_t http_server_create(void)
1451 {
1452     http_server_t hs = xmalloc(sizeof(*hs));
1453     hs->mutex = 0;
1454     hs->proxy_addr = 0;
1455     hs->ref_count = 1;
1456     hs->http_sessions = 0;
1457     hs->record_file = 0;
1458
1459     log_level_post = yaz_log_module_level("post");
1460
1461     return hs;
1462 }
1463
1464 void http_server_destroy(http_server_t hs)
1465 {
1466     if (hs)
1467     {
1468         int r;
1469
1470         yaz_mutex_enter(hs->mutex); /* OK: hs->mutex may be NULL */
1471         r = --(hs->ref_count);
1472         yaz_mutex_leave(hs->mutex);
1473
1474         if (r == 0)
1475         {
1476             http_sessions_destroy(hs->http_sessions);
1477             xfree(hs->proxy_addr);
1478             yaz_mutex_destroy(&hs->mutex);
1479             if (hs->record_file)
1480                 fclose(hs->record_file);
1481             xfree(hs);
1482         }
1483     }
1484 }
1485
1486 void http_server_incref(http_server_t hs)
1487 {
1488     assert(hs);
1489     yaz_mutex_enter(hs->mutex);
1490     (hs->ref_count)++;
1491     yaz_mutex_leave(hs->mutex);
1492 }
1493
1494 void http_mutex_init(struct conf_server *server)
1495 {
1496     assert(server);
1497
1498     assert(server->http_server->mutex == 0);
1499     pazpar2_mutex_create(&server->http_server->mutex, "http_server");
1500     server->http_server->http_sessions = http_sessions_create();
1501 }
1502
1503 /*
1504  * Local variables:
1505  * c-basic-offset: 4
1506  * c-file-style: "Stroustrup"
1507  * indent-tabs-mode: nil
1508  * End:
1509  * vim: shiftwidth=4 tabstop=8 expandtab
1510  */
1511