src/zgdu.c

   1 /*
   2  * Copyright (c) 2002-2004, Index Data.
   3  * See the file LICENSE for details.
   4  *
   5  * $Id: zgdu.c,v 1.7 2004-02-23 10:14:06 adam Exp $
   6  */
   7
   8 #include <ctype.h>
   9 #include <yaz/odr.h>
  10 #include <yaz/yaz-version.h>
  11 #include <yaz/yaz-iconv.h>
  12 #include <yaz/zgdu.h>
  13
  14 #ifdef WIN32
  15 #define strncasecmp _strnicmp
  16 #define strcasecmp _stricmp
  17 #endif
  18
  19 static int decode_headers_content(ODR o, int off, Z_HTTP_Header **headers,
  20                                   char **content_buf, int *content_len)
  21 {
  22     int i = off;
  23     int chunked = 0;
  24
  25     *headers = 0;
  26     while (i < o->size-1 && o->buf[i] == '\r')
  27     {
  28         int po;
  29         i++;
  30         if (o->buf[i] != '\n')
  31         {
  32             o->error = OHTTP;
  33             return 0;
  34         }
  35         i++;
  36         if (o->buf[i] == '\r')
  37             break;
  38         for (po = i; ; i++)
  39         {
  40             if (i == o->size)
  41             {
  42                 o->error = OHTTP;
  43                 return 0;
  44             }
  45             else if (o->buf[i] == ':')
  46                 break;
  47         }
  48         *headers = (Z_HTTP_Header *) odr_malloc(o, sizeof(**headers));
  49         (*headers)->name = (char*) odr_malloc(o, i - po + 1);
  50         memcpy ((*headers)->name, o->buf + po, i - po);
  51         (*headers)->name[i - po] = '\0';
  52         i++;
  53         while (i < o->size-1 && o->buf[i] == ' ')
  54             i++;
  55         for (po = i; i < o->size-1 && o->buf[i] != '\r' ; i++)
  56             ;
  57
  58         (*headers)->value = (char*) odr_malloc(o, i - po + 1);
  59         memcpy ((*headers)->value, o->buf + po, i - po);
  60         (*headers)->value[i - po] = '\0';
  61
  62         if (!strcasecmp((*headers)->name, "Transfer-Encoding")
  63             &&
  64             !strcasecmp((*headers)->value, "chunked"))
  65             chunked = 1;
  66         headers = &(*headers)->next;
  67     }
  68     *headers = 0;
  69     i++;
  70     if (o->buf[i] != '\n')
  71     {
  72         o->error = OHTTP;
  73         return 0;
  74     }
  75     i++;
  76
  77     if (chunked)
  78     {
  79         int off = 0;
  80
  81         /* we know buffer will be smaller than o->size - i - 2*/
  82         *content_buf = (char*) odr_malloc(o, o->size - i - 2);
  83
  84         while (1)
  85         {
  86             int chunk_len = 0;
  87             for (; i  < o->size-2; i++)
  88                 if (isdigit(o->buf[i]))
  89                     chunk_len = chunk_len * 16 +
  90                         (o->buf[i] - '0');
  91                 else if (isupper(o->buf[i]))
  92                     chunk_len = chunk_len * 16 +
  93                         (o->buf[i] - ('A'-10));
  94                 else if (islower(o->buf[i]))
  95                     chunk_len = chunk_len * 16 +
  96                         (o->buf[i] - ('a'-10));
  97                 else
  98                     break;
  99             if (i > o->size - 2)
 100                 break;
 101             if (o->buf[i] != '\r' || o->buf[i+1] != '\n')
 102             {   /* chunk length must be followed by \r\n */
 103                 o->error = OHTTP;
 104                 return 0;
 105             }
 106             i += 2;
 107             if (chunk_len == 0)
 108                 break;
 109             if (chunk_len < 0 || off + chunk_len > o->size)
 110             {
 111                 o->error = OHTTP;
 112                 return 0;
 113             }
 114             memcpy (*content_buf + off, o->buf + i, chunk_len);
 115             i += chunk_len;
 116             off += chunk_len;
 117         }
 118         if (!off)
 119             *content_buf = 0;
 120         *content_len = off;
 121     }
 122     else
 123     {
 124         if (i > o->size)
 125         {
 126             o->error = OHTTP;
 127             return 0;
 128         }
 129         else if (i == o->size)
 130         {
 131             *content_buf = 0;
 132             *content_len = 0;
 133         }
 134         else
 135         {
 136             *content_len = o->size - i;
 137             *content_buf = (char*) odr_malloc(o, *content_len + 1);
 138             memcpy(*content_buf, o->buf + i, *content_len);
 139             (*content_buf)[*content_len] = '\0';
 140         }
 141     }
 142     return 1;
 143 }
 144
 145 void z_HTTP_header_add(ODR o, Z_HTTP_Header **hp, const char *n,
 146                        const char *v)
 147 {
 148     while (*hp)
 149         hp = &(*hp)->next;
 150     *hp = (Z_HTTP_Header *) odr_malloc(o, sizeof(**hp));
 151     (*hp)->name = odr_strdup(o, n);
 152     (*hp)->value = odr_strdup(o, v);
 153     (*hp)->next = 0;
 154 }
 155
 156 const char *z_HTTP_header_lookup(Z_HTTP_Header *hp, const char *n)
 157 {
 158     for (; hp; hp = hp->next)
 159         if (!yaz_matchstr(hp->name, n))
 160             return hp->value;
 161     return 0;
 162 }
 163
 164
 165 Z_GDU *z_get_HTTP_Request(ODR o)
 166 {
 167     Z_GDU *p = (Z_GDU *) odr_malloc(o, sizeof(*p));
 168     Z_HTTP_Request *hreq;
 169
 170     p->which = Z_GDU_HTTP_Request;
 171     p->u.HTTP_Request = (Z_HTTP_Request *) odr_malloc(o, sizeof(*hreq));
 172     hreq = p->u.HTTP_Request;
 173     hreq->headers = 0;
 174     hreq->content_len = 0;
 175     hreq->content_buf = 0;
 176     hreq->version = "1.1";
 177     hreq->method = "POST";
 178     hreq->path = "/";
 179     z_HTTP_header_add(o, &hreq->headers, "User-Agent",
 180                       "YAZ/" YAZ_VERSION);
 181     return p;
 182 }
 183
 184 Z_GDU *z_get_HTTP_Response(ODR o, int code)
 185 {
 186     Z_GDU *p = (Z_GDU *) odr_malloc(o, sizeof(*p));
 187     Z_HTTP_Response *hres;
 188
 189     p->which = Z_GDU_HTTP_Response;
 190     p->u.HTTP_Response = (Z_HTTP_Response *) odr_malloc(o, sizeof(*hres));
 191     hres = p->u.HTTP_Response;
 192     hres->headers = 0;
 193     hres->content_len = 0;
 194     hres->content_buf = 0;
 195     hres->code = code;
 196     hres->version = "1.1";
 197     z_HTTP_header_add(o, &hres->headers, "Server",
 198                       "YAZ/" YAZ_VERSION);
 199     if (code != 200)
 200     {
 201         hres->content_buf = (char*) odr_malloc(o, 400);
 202         sprintf (hres->content_buf,
 203                  "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\n"
 204                  "<HTML>\n"
 205                  " <HEAD>\n"
 206                  "  <TITLE>YAZ " YAZ_VERSION "</TITLE>\n"
 207                  " </HEAD>\n"
 208                  " <BODY>\n"
 209                  "  <P><A HREF=\"http://www.indexdata.dk/yaz/\">YAZ</A> "
 210                  YAZ_VERSION "</P>\n"
 211                  "  <P>Error: %d</P>\n"
 212                  "  <P>Description: %.50s</P>\n"
 213                  " </BODY>\n"
 214                  "</HTML>\n",
 215                  code, z_HTTP_errmsg(code));
 216         hres->content_len = strlen(hres->content_buf);
 217         z_HTTP_header_add(o, &hres->headers, "Content-Type", "text/html");
 218     }
 219     return p;
 220 }
 221
 222 const char *z_HTTP_errmsg(int code)
 223 {
 224     if (code == 200)
 225         return "OK";
 226     else if (code == 400)
 227         return "Bad Request";
 228     else if (code == 404)
 229         return "Not Found";
 230     else if (code == 405)
 231         return "Method Not Allowed";
 232     else if (code == 500)
 233         return "Internal Error";
 234     else
 235         return "Unknown Error";
 236 }
 237
 238 int z_GDU (ODR o, Z_GDU **p, int opt, const char *name)
 239 {
 240     if (o->direction == ODR_DECODE) {
 241         *p = (Z_GDU *) odr_malloc(o, sizeof(**p));
 242         if (o->size > 10 && !memcmp(o->buf, "HTTP/", 5))
 243         {
 244             int i, po;
 245             Z_HTTP_Response *hr;
 246             (*p)->which = Z_GDU_HTTP_Response;
 247
 248             hr = (*p)->u.HTTP_Response = (Z_HTTP_Response *)
 249                 odr_malloc(o, sizeof(*hr));
 250             po = i = 5;
 251             while (i < o->size-2 && o->buf[i] != ' ' && o->buf[i] != '\r')
 252                 i++;
 253             hr->version = (char *) odr_malloc(o, i - po + 1);
 254             if (i - po)
 255                 memcpy(hr->version, o->buf + po, i - po);
 256             hr->version[i-po] = 0;
 257             if (o->buf[i] != ' ')
 258             {
 259                 o->error = OHTTP;
 260                 return 0;
 261             }
 262             i++;
 263             hr->code = 0;
 264             while (i < o->size-2 && o->buf[i] >= '0' && o->buf[i] <= '9')
 265             {
 266                 hr->code = hr->code*10 + (o->buf[i] - '0');
 267                 i++;
 268             }
 269             while (i < o->size-1 && o->buf[i] != '\r')
 270                 i++;
 271             return decode_headers_content(o, i, &hr->headers,
 272                                           &hr->content_buf, &hr->content_len);
 273         }
 274         else if (o->size > 5 &&
 275             o->buf[0] >= 0x20 && o->buf[0] < 0x7f
 276             && o->buf[1] >= 0x20 && o->buf[1] < 0x7f
 277             && o->buf[2] >= 0x20 && o->buf[2] < 0x7f
 278             && o->buf[3] >= 0x20 && o->buf[3] < 0x7f)
 279         {
 280             int i, po;
 281             Z_HTTP_Request *hr;
 282
 283             (*p)->which = Z_GDU_HTTP_Request;
 284             hr = (*p)->u.HTTP_Request =
 285                 (Z_HTTP_Request *) odr_malloc(o, sizeof(*hr));
 286
 287             /* method .. */
 288             for (i = 0; o->buf[i] != ' '; i++)
 289                 if (i >= o->size-5 || i > 30)
 290                 {
 291                     o->error = OHTTP;
 292                     return 0;
 293                 }
 294             hr->method = (char *) odr_malloc(o, i+1);
 295             memcpy (hr->method, o->buf, i);
 296             hr->method[i] = '\0';
 297             /* path */
 298             po = i+1;
 299             for (i = po; o->buf[i] != ' '; i++)
 300                 if (i >= o->size-5)
 301                 {
 302                     o->error = OHTTP;
 303                     return 0;
 304                 }
 305             hr->path = (char *) odr_malloc(o, i - po + 1);
 306             memcpy (hr->path, o->buf+po, i - po);
 307             hr->path[i - po] = '\0';
 308             /* HTTP version */
 309             i++;
 310             if (i > o->size-5 || memcmp(o->buf+i, "HTTP/", 5))
 311             {
 312                 o->error = OHTTP;
 313                 return 0;
 314             }
 315             i+= 5;
 316             po = i;
 317             while (o->buf[i] != '\r')
 318             {
 319                 if (i >= o->size-1)
 320                 {
 321                     o->error = OHTTP;
 322                     return 0;
 323                 }
 324                 i++;
 325             }
 326             hr->version = (char *) odr_malloc(o, i - po + 1);
 327             memcpy(hr->version, o->buf + po, i - po);
 328             hr->version[i - po] = '\0';
 329             /* headers */
 330             return decode_headers_content(o, i, &hr->headers,
 331                                           &hr->content_buf, &hr->content_len);
 332
 333         }
 334         else
 335         {
 336             (*p)->which = Z_GDU_Z3950;
 337             return z_APDU(o, &(*p)->u.z3950, opt, 0);
 338         }
 339     }
 340     else /* ENCODE or PRINT */
 341     {
 342         int top0 = o->top;
 343         char sbuf[80];
 344         Z_HTTP_Header *h;
 345         switch((*p)->which)
 346         {
 347         case Z_GDU_HTTP_Response:
 348             sprintf(sbuf, "HTTP/%s %d %s\r\n", (*p)->u.HTTP_Response->version,
 349                     (*p)->u.HTTP_Response->code,
 350                     z_HTTP_errmsg((*p)->u.HTTP_Response->code));
 351             odr_write(o, (unsigned char *) sbuf, strlen(sbuf));
 352             /* apply Content-Length if not already applied */
 353             if (!z_HTTP_header_lookup((*p)->u.HTTP_Response->headers,
 354                                       "Content-Length"))
 355             {
 356                 char lstr[60];
 357                 sprintf(lstr, "Content-Length: %d\r\n",
 358                         (*p)->u.HTTP_Response->content_len);
 359                 odr_write(o, (unsigned char *) lstr, strlen(lstr));
 360             }
 361             for (h = (*p)->u.HTTP_Response->headers; h; h = h->next)
 362             {
 363                 odr_write(o, (unsigned char *) h->name, strlen(h->name));
 364                 odr_write(o, (unsigned char *) ": ", 2);
 365                 odr_write(o, (unsigned char *) h->value, strlen(h->value));
 366                 odr_write(o, (unsigned char *) "\r\n", 2);
 367             }
 368             odr_write(o, (unsigned char *) "\r\n", 2);
 369             if ((*p)->u.HTTP_Response->content_buf)
 370                 odr_write(o, (unsigned char *)
 371                           (*p)->u.HTTP_Response->content_buf,
 372                           (*p)->u.HTTP_Response->content_len);
 373             if (o->direction == ODR_PRINT)
 374             {
 375                 fprintf(o->print, "-- HTTP response:\n%.*s\n", o->top - top0,
 376                         o->buf + top0);
 377                 fprintf(o->print, "-- \n");
 378             }
 379             break;
 380         case Z_GDU_HTTP_Request:
 381             odr_write(o, (unsigned char *) (*p)->u.HTTP_Request->method,
 382                       strlen((*p)->u.HTTP_Request->method));
 383             odr_write(o, (unsigned char *) " ", 1);
 384             odr_write(o, (unsigned char *) (*p)->u.HTTP_Request->path,
 385                       strlen((*p)->u.HTTP_Request->path));
 386             odr_write(o, (unsigned char *) " HTTP/", 6);
 387             odr_write(o, (unsigned char *) (*p)->u.HTTP_Request->version,
 388                       strlen((*p)->u.HTTP_Request->version));
 389             odr_write(o, (unsigned char *) "\r\n", 2);
 390             if ((*p)->u.HTTP_Request->content_len &&
 391                 !z_HTTP_header_lookup((*p)->u.HTTP_Request->headers,
 392                                       "Content-Length"))
 393             {
 394                 char lstr[60];
 395                 sprintf(lstr, "Content-Length: %d\r\n",
 396                         (*p)->u.HTTP_Request->content_len);
 397                 odr_write(o, (unsigned char *) lstr, strlen(lstr));
 398             }
 399             for (h = (*p)->u.HTTP_Request->headers; h; h = h->next)
 400             {
 401                 odr_write(o, (unsigned char *) h->name, strlen(h->name));
 402                 odr_write(o, (unsigned char *) ": ", 2);
 403                 odr_write(o, (unsigned char *) h->value, strlen(h->value));
 404                 odr_write(o, (unsigned char *) "\r\n", 2);
 405             }
 406             odr_write(o, (unsigned char *) "\r\n", 2);
 407             if ((*p)->u.HTTP_Request->content_buf)
 408                 odr_write(o, (unsigned char *)
 409                           (*p)->u.HTTP_Request->content_buf,
 410                           (*p)->u.HTTP_Request->content_len);
 411             if (o->direction == ODR_PRINT)
 412             {
 413                 fprintf(o->print, "-- HTTP request:\n%.*s\n", o->top - top0,
 414                         o->buf + top0);
 415                 fprintf(o->print, "-- \n");
 416             }
 417             break;
 418         case Z_GDU_Z3950:
 419             return z_APDU(o, &(*p)->u.z3950, opt, 0);
 420         }
 421     }
 422     return 1;
 423 }
 424