src/zgdu.c

   1 /*
   2  * Copyright (c) 2002-2004, Index Data.
   3  * See the file LICENSE for details.
   4  *
   5  * $Id: zgdu.c,v 1.11 2004-10-15 00:19:01 adam Exp $
   6  */
   7
   8 /**
   9  * \file zgdu.c
  10  * \brief Implements HTTP and Z39.50 encoding and decoding.
  11  */
  12
  13 #include <ctype.h>
  14 #include <yaz/odr.h>
  15 #include <yaz/yaz-version.h>
  16 #include <yaz/yaz-iconv.h>
  17 #include <yaz/zgdu.h>
  18
  19 #ifdef WIN32
  20 #define strncasecmp _strnicmp
  21 #define strcasecmp _stricmp
  22 #endif
  23
  24 static int decode_headers_content(ODR o, int off, Z_HTTP_Header **headers,
  25                                   char **content_buf, int *content_len)
  26 {
  27     int i = off;
  28     int chunked = 0;
  29
  30     *headers = 0;
  31     while (i < o->size-1 && o->buf[i] == '\r')
  32     {
  33         int po;
  34         i++;
  35         if (o->buf[i] != '\n')
  36         {
  37             o->error = OHTTP;
  38             return 0;
  39         }
  40         i++;
  41         if (o->buf[i] == '\r')
  42             break;
  43         for (po = i; ; i++)
  44         {
  45             if (i == o->size)
  46             {
  47                 o->error = OHTTP;
  48                 return 0;
  49             }
  50             else if (o->buf[i] == ':')
  51                 break;
  52         }
  53         *headers = (Z_HTTP_Header *) odr_malloc(o, sizeof(**headers));
  54         (*headers)->name = (char*) odr_malloc(o, i - po + 1);
  55         memcpy ((*headers)->name, o->buf + po, i - po);
  56         (*headers)->name[i - po] = '\0';
  57         i++;
  58         while (i < o->size-1 && o->buf[i] == ' ')
  59             i++;
  60         for (po = i; i < o->size-1 && o->buf[i] != '\r' ; i++)
  61             ;
  62
  63         (*headers)->value = (char*) odr_malloc(o, i - po + 1);
  64         memcpy ((*headers)->value, o->buf + po, i - po);
  65         (*headers)->value[i - po] = '\0';
  66
  67         if (!strcasecmp((*headers)->name, "Transfer-Encoding")
  68             &&
  69             !strcasecmp((*headers)->value, "chunked"))
  70             chunked = 1;
  71         headers = &(*headers)->next;
  72     }
  73     *headers = 0;
  74     i++;
  75     if (o->buf[i] != '\n')
  76     {
  77         o->error = OHTTP;
  78         return 0;
  79     }
  80     i++;
  81
  82     if (chunked)
  83     {
  84         int off = 0;
  85
  86         /* we know buffer will be smaller than o->size - i*/
  87         *content_buf = (char*) odr_malloc(o, o->size - i);
  88
  89         while (1)
  90         {
  91             /* chunk length .. */
  92             int chunk_len = 0;
  93             for (; i  < o->size-2; i++)
  94                 if (isdigit(o->buf[i]))
  95                     chunk_len = chunk_len * 16 +
  96                         (o->buf[i] - '0');
  97                 else if (isupper(o->buf[i]))
  98                     chunk_len = chunk_len * 16 +
  99                         (o->buf[i] - ('A'-10));
 100                 else if (islower(o->buf[i]))
 101                     chunk_len = chunk_len * 16 +
 102                         (o->buf[i] - ('a'-10));
 103                 else
 104                     break;
 105             /* chunk extension ... */
 106             while (o->buf[i] != '\r' && o->buf[i+1] != '\n')
 107             {
 108                 if (i >= o->size-2)
 109                 {
 110                     o->error = OHTTP;
 111                     return 0;
 112                 }
 113                 i++;
 114             }
 115             i += 2;  /* skip CRLF */
 116             if (chunk_len == 0)
 117                 break;
 118             if (chunk_len < 0 || off + chunk_len > o->size)
 119             {
 120                 o->error = OHTTP;
 121                 return 0;
 122             }
 123             /* copy chunk .. */
 124             memcpy (*content_buf + off, o->buf + i, chunk_len);
 125             i += chunk_len + 2; /* skip chunk+CRLF */
 126             off += chunk_len;
 127         }
 128         if (!off)
 129             *content_buf = 0;
 130         *content_len = off;
 131     }
 132     else
 133     {
 134         if (i > o->size)
 135         {
 136             o->error = OHTTP;
 137             return 0;
 138         }
 139         else if (i == o->size)
 140         {
 141             *content_buf = 0;
 142             *content_len = 0;
 143         }
 144         else
 145         {
 146             *content_len = o->size - i;
 147             *content_buf = (char*) odr_malloc(o, *content_len + 1);
 148             memcpy(*content_buf, o->buf + i, *content_len);
 149             (*content_buf)[*content_len] = '\0';
 150         }
 151     }
 152     return 1;
 153 }
 154
 155 void z_HTTP_header_add(ODR o, Z_HTTP_Header **hp, const char *n,
 156                        const char *v)
 157 {
 158     while (*hp)
 159         hp = &(*hp)->next;
 160     *hp = (Z_HTTP_Header *) odr_malloc(o, sizeof(**hp));
 161     (*hp)->name = odr_strdup(o, n);
 162     (*hp)->value = odr_strdup(o, v);
 163     (*hp)->next = 0;
 164 }
 165
 166 const char *z_HTTP_header_lookup(Z_HTTP_Header *hp, const char *n)
 167 {
 168     for (; hp; hp = hp->next)
 169         if (!yaz_matchstr(hp->name, n))
 170             return hp->value;
 171     return 0;
 172 }
 173
 174
 175 Z_GDU *z_get_HTTP_Request(ODR o)
 176 {
 177     Z_GDU *p = (Z_GDU *) odr_malloc(o, sizeof(*p));
 178     Z_HTTP_Request *hreq;
 179
 180     p->which = Z_GDU_HTTP_Request;
 181     p->u.HTTP_Request = (Z_HTTP_Request *) odr_malloc(o, sizeof(*hreq));
 182     hreq = p->u.HTTP_Request;
 183     hreq->headers = 0;
 184     hreq->content_len = 0;
 185     hreq->content_buf = 0;
 186     hreq->version = "1.1";
 187     hreq->method = "POST";
 188     hreq->path = "/";
 189     z_HTTP_header_add(o, &hreq->headers, "User-Agent",
 190                       "YAZ/" YAZ_VERSION);
 191     return p;
 192 }
 193
 194 Z_GDU *z_get_HTTP_Response(ODR o, int code)
 195 {
 196     Z_GDU *p = (Z_GDU *) odr_malloc(o, sizeof(*p));
 197     Z_HTTP_Response *hres;
 198
 199     p->which = Z_GDU_HTTP_Response;
 200     p->u.HTTP_Response = (Z_HTTP_Response *) odr_malloc(o, sizeof(*hres));
 201     hres = p->u.HTTP_Response;
 202     hres->headers = 0;
 203     hres->content_len = 0;
 204     hres->content_buf = 0;
 205     hres->code = code;
 206     hres->version = "1.1";
 207     z_HTTP_header_add(o, &hres->headers, "Server",
 208                       "YAZ/" YAZ_VERSION);
 209     if (code != 200)
 210     {
 211         hres->content_buf = (char*) odr_malloc(o, 400);
 212         sprintf (hres->content_buf,
 213                  "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\n"
 214                  "<HTML>\n"
 215                  " <HEAD>\n"
 216                  "  <TITLE>YAZ " YAZ_VERSION "</TITLE>\n"
 217                  " </HEAD>\n"
 218                  " <BODY>\n"
 219                  "  <P><A HREF=\"http://www.indexdata.dk/yaz/\">YAZ</A> "
 220                  YAZ_VERSION "</P>\n"
 221                  "  <P>Error: %d</P>\n"
 222                  "  <P>Description: %.50s</P>\n"
 223                  " </BODY>\n"
 224                  "</HTML>\n",
 225                  code, z_HTTP_errmsg(code));
 226         hres->content_len = strlen(hres->content_buf);
 227         z_HTTP_header_add(o, &hres->headers, "Content-Type", "text/html");
 228     }
 229     return p;
 230 }
 231
 232 const char *z_HTTP_errmsg(int code)
 233 {
 234     if (code == 200)
 235         return "OK";
 236     else if (code == 400)
 237         return "Bad Request";
 238     else if (code == 404)
 239         return "Not Found";
 240     else if (code == 405)
 241         return "Method Not Allowed";
 242     else if (code == 500)
 243         return "Internal Error";
 244     else
 245         return "Unknown Error";
 246 }
 247
 248 int z_GDU (ODR o, Z_GDU **p, int opt, const char *name)
 249 {
 250     if (o->direction == ODR_DECODE) {
 251         *p = (Z_GDU *) odr_malloc(o, sizeof(**p));
 252         if (o->size > 10 && !memcmp(o->buf, "HTTP/", 5))
 253         {
 254             int i, po;
 255             Z_HTTP_Response *hr;
 256             (*p)->which = Z_GDU_HTTP_Response;
 257
 258             hr = (*p)->u.HTTP_Response = (Z_HTTP_Response *)
 259                 odr_malloc(o, sizeof(*hr));
 260             hr->content_buf = 0;
 261             hr->content_len = 0;
 262
 263             po = i = 5;
 264             while (i < o->size-2 && o->buf[i] != ' ' && o->buf[i] != '\r')
 265                 i++;
 266             hr->version = (char *) odr_malloc(o, i - po + 1);
 267             if (i - po)
 268                 memcpy(hr->version, o->buf + po, i - po);
 269             hr->version[i-po] = 0;
 270             if (o->buf[i] != ' ')
 271             {
 272                 o->error = OHTTP;
 273                 return 0;
 274             }
 275             i++;
 276             hr->code = 0;
 277             while (i < o->size-2 && o->buf[i] >= '0' && o->buf[i] <= '9')
 278             {
 279                 hr->code = hr->code*10 + (o->buf[i] - '0');
 280                 i++;
 281             }
 282             while (i < o->size-1 && o->buf[i] != '\r')
 283                 i++;
 284             return decode_headers_content(o, i, &hr->headers,
 285                                           &hr->content_buf, &hr->content_len);
 286         }
 287         else if (o->size > 5 &&
 288             o->buf[0] >= 0x20 && o->buf[0] < 0x7f
 289             && o->buf[1] >= 0x20 && o->buf[1] < 0x7f
 290             && o->buf[2] >= 0x20 && o->buf[2] < 0x7f
 291             && o->buf[3] >= 0x20 && o->buf[3] < 0x7f)
 292         {
 293             int i, po;
 294             Z_HTTP_Request *hr;
 295
 296             (*p)->which = Z_GDU_HTTP_Request;
 297             hr = (*p)->u.HTTP_Request =
 298                 (Z_HTTP_Request *) odr_malloc(o, sizeof(*hr));
 299
 300             /* method .. */
 301             for (i = 0; o->buf[i] != ' '; i++)
 302                 if (i >= o->size-5 || i > 30)
 303                 {
 304                     o->error = OHTTP;
 305                     return 0;
 306                 }
 307             hr->method = (char *) odr_malloc(o, i+1);
 308             memcpy (hr->method, o->buf, i);
 309             hr->method[i] = '\0';
 310             /* path */
 311             po = i+1;
 312             for (i = po; o->buf[i] != ' '; i++)
 313                 if (i >= o->size-5)
 314                 {
 315                     o->error = OHTTP;
 316                     return 0;
 317                 }
 318             hr->path = (char *) odr_malloc(o, i - po + 1);
 319             memcpy (hr->path, o->buf+po, i - po);
 320             hr->path[i - po] = '\0';
 321             /* HTTP version */
 322             i++;
 323             if (i > o->size-5 || memcmp(o->buf+i, "HTTP/", 5))
 324             {
 325                 o->error = OHTTP;
 326                 return 0;
 327             }
 328             i+= 5;
 329             po = i;
 330             while (o->buf[i] != '\r')
 331             {
 332                 if (i >= o->size-1)
 333                 {
 334                     o->error = OHTTP;
 335                     return 0;
 336                 }
 337                 i++;
 338             }
 339             hr->version = (char *) odr_malloc(o, i - po + 1);
 340             memcpy(hr->version, o->buf + po, i - po);
 341             hr->version[i - po] = '\0';
 342             /* headers */
 343             return decode_headers_content(o, i, &hr->headers,
 344                                           &hr->content_buf, &hr->content_len);
 345
 346         }
 347         else
 348         {
 349             (*p)->which = Z_GDU_Z3950;
 350             return z_APDU(o, &(*p)->u.z3950, opt, 0);
 351         }
 352     }
 353     else /* ENCODE or PRINT */
 354     {
 355         int top0 = o->top;
 356         char sbuf[80];
 357         Z_HTTP_Header *h;
 358         switch((*p)->which)
 359         {
 360         case Z_GDU_HTTP_Response:
 361             sprintf(sbuf, "HTTP/%s %d %s\r\n", (*p)->u.HTTP_Response->version,
 362                     (*p)->u.HTTP_Response->code,
 363                     z_HTTP_errmsg((*p)->u.HTTP_Response->code));
 364             odr_write(o, (unsigned char *) sbuf, strlen(sbuf));
 365             /* apply Content-Length if not already applied */
 366             if (!z_HTTP_header_lookup((*p)->u.HTTP_Response->headers,
 367                                       "Content-Length"))
 368             {
 369                 char lstr[60];
 370                 sprintf(lstr, "Content-Length: %d\r\n",
 371                         (*p)->u.HTTP_Response->content_len);
 372                 odr_write(o, (unsigned char *) lstr, strlen(lstr));
 373             }
 374             for (h = (*p)->u.HTTP_Response->headers; h; h = h->next)
 375             {
 376                 odr_write(o, (unsigned char *) h->name, strlen(h->name));
 377                 odr_write(o, (unsigned char *) ": ", 2);
 378                 odr_write(o, (unsigned char *) h->value, strlen(h->value));
 379                 odr_write(o, (unsigned char *) "\r\n", 2);
 380             }
 381             odr_write(o, (unsigned char *) "\r\n", 2);
 382             if ((*p)->u.HTTP_Response->content_buf)
 383                 odr_write(o, (unsigned char *)
 384                           (*p)->u.HTTP_Response->content_buf,
 385                           (*p)->u.HTTP_Response->content_len);
 386             if (o->direction == ODR_PRINT)
 387             {
 388                 odr_printf(o, "-- HTTP response:\n%.*s\n", o->top - top0,
 389                            o->buf + top0);
 390                 odr_printf(o, "-- \n");
 391             }
 392             break;
 393         case Z_GDU_HTTP_Request:
 394             odr_write(o, (unsigned char *) (*p)->u.HTTP_Request->method,
 395                       strlen((*p)->u.HTTP_Request->method));
 396             odr_write(o, (unsigned char *) " ", 1);
 397             odr_write(o, (unsigned char *) (*p)->u.HTTP_Request->path,
 398                       strlen((*p)->u.HTTP_Request->path));
 399             odr_write(o, (unsigned char *) " HTTP/", 6);
 400             odr_write(o, (unsigned char *) (*p)->u.HTTP_Request->version,
 401                       strlen((*p)->u.HTTP_Request->version));
 402             odr_write(o, (unsigned char *) "\r\n", 2);
 403             if ((*p)->u.HTTP_Request->content_len &&
 404                 !z_HTTP_header_lookup((*p)->u.HTTP_Request->headers,
 405                                       "Content-Length"))
 406             {
 407                 char lstr[60];
 408                 sprintf(lstr, "Content-Length: %d\r\n",
 409                         (*p)->u.HTTP_Request->content_len);
 410                 odr_write(o, (unsigned char *) lstr, strlen(lstr));
 411             }
 412             for (h = (*p)->u.HTTP_Request->headers; h; h = h->next)
 413             {
 414                 odr_write(o, (unsigned char *) h->name, strlen(h->name));
 415                 odr_write(o, (unsigned char *) ": ", 2);
 416                 odr_write(o, (unsigned char *) h->value, strlen(h->value));
 417                 odr_write(o, (unsigned char *) "\r\n", 2);
 418             }
 419             odr_write(o, (unsigned char *) "\r\n", 2);
 420             if ((*p)->u.HTTP_Request->content_buf)
 421                 odr_write(o, (unsigned char *)
 422                           (*p)->u.HTTP_Request->content_buf,
 423                           (*p)->u.HTTP_Request->content_len);
 424             if (o->direction == ODR_PRINT)
 425             {
 426                 odr_printf(o, "-- HTTP request:\n%.*s\n", o->top - top0,
 427                         o->buf + top0);
 428                 odr_printf(o, "-- \n");
 429             }
 430             break;
 431         case Z_GDU_Z3950:
 432             return z_APDU(o, &(*p)->u.z3950, opt, 0);
 433         }
 434     }
 435     return 1;
 436 }
 437