zutil/zgdu.c

   1 /*
   2  * Copyright (c) 2002-2003, Index Data.
   3  * See the file LICENSE for details.
   4  *
   5  * $Id: zgdu.c,v 1.1 2003-02-12 15:06:44 adam Exp $
   6  */
   7
   8 #include <yaz/proto.h>
   9
  10 #define HTTP_DEBUG 0
  11
  12 static int decode_headers_content(ODR o, int off, Z_HTTP_Header **headers,
  13                                   char **content_buf, int *content_len)
  14 {
  15     int i = off;
  16
  17     *headers = 0;
  18     while (i < o->size-1 && o->buf[i] == '\r')
  19     {
  20         int po;
  21         i++;
  22         if (o->buf[i] != '\n')
  23         {
  24             o->error = OHTTP;
  25             return 0;
  26         }
  27         i++;
  28         if (o->buf[i] == '\r')
  29             break;
  30         for (po = i; ; i++)
  31         {
  32             if (i == o->size)
  33             {
  34                 o->error = OHTTP;
  35                 return 0;
  36             }
  37             else if (o->buf[i] == ':')
  38                 break;
  39         }
  40         *headers = odr_malloc(o, sizeof(**headers));
  41         (*headers)->name = odr_malloc(o, i - po + 1);
  42         memcpy ((*headers)->name, o->buf + po, i - po);
  43         (*headers)->name[i - po] = '\0';
  44         i++;
  45         while (i < o->size-1 && o->buf[i] == ' ')
  46             i++;
  47         for (po = i; i < o->size-1 && o->buf[i] != '\r' ; i++)
  48             ;
  49
  50         (*headers)->value = odr_malloc(o, i - po + 1);
  51         memcpy ((*headers)->value, o->buf + po, i - po);
  52         (*headers)->value[i - po] = '\0';
  53
  54         headers = &(*headers)->next;
  55     }
  56     *headers = 0;
  57     i++;
  58     if (o->buf[i] != '\n')
  59     {
  60         o->error = OHTTP;
  61         return 0;
  62     }
  63     i++;
  64
  65     if (i > o->size)
  66     {
  67         o->error = OHTTP;
  68         return 0;
  69     }
  70     else if (i == o->size)
  71     {
  72         *content_buf = 0;
  73         *content_len = 0;
  74     }
  75     else
  76     {
  77         *content_len = o->size - i;
  78         *content_buf = odr_malloc(o, *content_len + 1);
  79         memcpy(*content_buf, o->buf + i, *content_len);
  80         (*content_buf)[*content_len] = '\0';
  81     }
  82     return 1;
  83 }
  84
  85 void z_HTTP_header_add(ODR o, Z_HTTP_Header **hp, const char *n,
  86                        const char *v)
  87 {
  88     while (*hp)
  89         hp = &(*hp)->next;
  90     *hp = odr_malloc(o, sizeof(**hp));
  91     (*hp)->name = odr_strdup(o, n);
  92     (*hp)->value = odr_strdup(o, v);
  93     (*hp)->next = 0;
  94 }
  95
  96 const char *z_HTTP_header_lookup(Z_HTTP_Header *hp, const char *n)
  97 {
  98     for (; hp; hp = hp->next)
  99         if (!strcmp(hp->name, n))
 100             return hp->value;
 101     return 0;
 102 }
 103
 104
 105 Z_GDU *z_get_HTTP_Response(ODR o, int code)
 106 {
 107     Z_GDU *p = odr_malloc(o, sizeof(*p));
 108     Z_HTTP_Response *hres;
 109
 110     p->which = Z_GDU_HTTP_Response;
 111     hres = p->u.HTTP_Response = odr_malloc(o, sizeof(*hres));
 112     hres->headers = 0;
 113     hres->content_len = 0;
 114     hres->content_buf = 0;
 115     hres->code = code;
 116     hres->version = "1.1";
 117     z_HTTP_header_add(o, &hres->headers, "Server",
 118                       "YAZ/" YAZ_VERSION);
 119     if (code != 200)
 120     {
 121         hres->content_buf = odr_malloc(o, 400);
 122         sprintf (hres->content_buf,
 123                  "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\n"
 124                  "<HTML>\n"
 125                  " <HEAD>\n"
 126                  "  <TITLE>YAZ " YAZ_VERSION "</TITLE>\n"
 127                  " </HEAD>\n"
 128                  " <BODY>\n"
 129                  "  <P><A HREF=\"http://www.indexdata.dk/yaz/\">YAZ</A> "
 130                  YAZ_VERSION "</P>\n"
 131                  "  <P>Error: %d</P>\n"
 132                  "  <P>Description: %.50s</P>\n"
 133                  " </BODY>\n"
 134                  "</HTML>\n",
 135                  code, z_HTTP_errmsg(code));
 136         hres->content_len = strlen(hres->content_buf);
 137         z_HTTP_header_add(o, &hres->headers, "Content-Type", "text/html");
 138     }
 139     return p;
 140 }
 141
 142 const char *z_HTTP_errmsg(int code)
 143 {
 144     if (code == 200)
 145         return "OK";
 146     else if (code == 400)
 147         return "Bad Request";
 148     else if (code == 404)
 149         return "Not Found";
 150     else if (code == 405)
 151         return "Method Not Allowed";
 152     else if (code == 500)
 153         return "Internal Error";
 154     else
 155         return "Unknown Error";
 156 }
 157
 158 int z_GDU (ODR o, Z_GDU **p, int opt, const char *name)
 159 {
 160     if (o->direction == ODR_DECODE) {
 161         *p = odr_malloc(o, sizeof(**p));
 162         if (o->size > 10 && !memcmp(o->buf, "HTTP/", 5))
 163         {
 164             int i, po;
 165             Z_HTTP_Response *hr;
 166             (*p)->which = Z_GDU_HTTP_Response;
 167
 168             hr = (*p)->u.HTTP_Response = odr_malloc(o, sizeof(*hr));
 169
 170             po = i = 5;
 171             while (i < o->size-2 && o->buf[i] != ' ' && o->buf[i] != '\r')
 172                 i++;
 173             hr->version = odr_malloc(o, i - po + 1);
 174             if (i - po)
 175                 memcpy(hr->version, o->buf + po, i - po);
 176             hr->version[i-po] = 0;
 177             if (o->buf[i] != ' ')
 178             {
 179                 o->error = OHTTP;
 180                 return 0;
 181             }
 182             i++;
 183             hr->code = 0;
 184             while (i < o->size-2 && o->buf[i] >= '0' && o->buf[i] <= '9')
 185             {
 186                 hr->code = hr->code*10 + (o->buf[i] - '0');
 187                 i++;
 188             }
 189             while (i < o->size-1 && o->buf[i] != '\r')
 190                 i++;
 191             return decode_headers_content(o, i, &hr->headers,
 192                                           &hr->content_buf, &hr->content_len);
 193         }
 194         else if (o->size > 5 &&
 195             o->buf[0] >= 0x20 && o->buf[0] < 0x7f
 196             && o->buf[1] >= 0x20 && o->buf[1] < 0x7f
 197             && o->buf[2] >= 0x20 && o->buf[2] < 0x7f
 198             && o->buf[3] >= 0x20 && o->buf[3] < 0x7f)
 199         {
 200             int i, po;
 201             Z_HTTP_Request *hr;
 202
 203 #if HTTP_DEBUG
 204             fprintf(stderr, "HTTP decode:\n%.*s\n", o->size, o->buf);
 205 #endif
 206             (*p)->which = Z_GDU_HTTP_Request;
 207             hr = (*p)->u.HTTP_Request = odr_malloc(o, sizeof(*hr));
 208
 209             /* method .. */
 210             for (i = 0; o->buf[i] != ' '; i++)
 211                 if (i >= o->size-5 || i > 30)
 212                 {
 213                     o->error = OHTTP;
 214                     return 0;
 215                 }
 216             hr->method = odr_malloc(o, i+1);
 217             memcpy (hr->method, o->buf, i);
 218             hr->method[i] = '\0';
 219             /* path */
 220             po = i+1;
 221             for (i = po; o->buf[i] != ' '; i++)
 222                 if (i >= o->size-5)
 223                 {
 224                     o->error = OHTTP;
 225                     return 0;
 226                 }
 227             hr->path = odr_malloc(o, i - po + 1);
 228             memcpy (hr->path, o->buf+po, i - po);
 229             hr->path[i - po] = '\0';
 230             /* HTTP version */
 231             i++;
 232             if (i > o->size-5 || memcmp(o->buf+i, "HTTP/", 5))
 233             {
 234                 o->error = OHTTP;
 235                 return 0;
 236             }
 237             i+= 5;
 238             po = i;
 239             while (o->buf[i] != '\r')
 240             {
 241                 if (i >= o->size-1)
 242                 {
 243                     o->error = OHTTP;
 244                     return 0;
 245                 }
 246                 i++;
 247             }
 248             hr->version = odr_malloc(o, i - po + 1);
 249             memcpy(hr->version, o->buf + po, i - po);
 250             hr->version[i - po] = '\0';
 251             /* headers */
 252             return decode_headers_content(o, i, &hr->headers,
 253                                           &hr->content_buf, &hr->content_len);
 254
 255         }
 256         else
 257         {
 258             (*p)->which = Z_GDU_Z3950;
 259             return z_APDU(o, &(*p)->u.z3950, opt, 0);
 260         }
 261     }
 262     else if (o->direction == ODR_ENCODE)
 263     {
 264         char sbuf[80];
 265         Z_HTTP_Header *h;
 266         switch((*p)->which)
 267         {
 268         case Z_GDU_HTTP_Response:
 269             sprintf(sbuf, "HTTP/%s %d %s\r\n", (*p)->u.HTTP_Response->version,
 270                     (*p)->u.HTTP_Response->code,
 271                     z_HTTP_errmsg((*p)->u.HTTP_Response->code));
 272             odr_write(o, sbuf, strlen(sbuf));
 273             /* apply Content-Length if not already applied */
 274             if (!z_HTTP_header_lookup((*p)->u.HTTP_Response->headers,
 275                                       "Content-Length"))
 276             {
 277                 char lstr[20];
 278                 sprintf(lstr, "%d", (*p)->u.HTTP_Response->content_len);
 279                 z_HTTP_header_add(o,
 280                                   &(*p)->u.HTTP_Response->headers,
 281                                   "Content-Length", lstr);
 282             }
 283             for (h = (*p)->u.HTTP_Response->headers; h; h = h->next)
 284             {
 285                 odr_write(o, h->name, strlen(h->name));
 286                 odr_write(o, ": ", 2);
 287                 odr_write(o, h->value, strlen(h->value));
 288                 odr_write(o, "\r\n", 2);
 289             }
 290             odr_write(o, "\r\n", 2);
 291             if ((*p)->u.HTTP_Response->content_buf)
 292                 odr_write(o, (*p)->u.HTTP_Response->content_buf,
 293                           (*p)->u.HTTP_Response->content_len);
 294 #if HTTP_DEBUG
 295             fprintf(stderr, "HTTP response:\n%.*s\n", o->top, o->buf);
 296 #endif
 297             break;
 298         case Z_GDU_HTTP_Request:
 299             odr_write(o, (*p)->u.HTTP_Request->method,
 300                       strlen((*p)->u.HTTP_Request->method));
 301             odr_write(o, " ", 1);
 302             odr_write(o, (*p)->u.HTTP_Request->path,
 303                       strlen((*p)->u.HTTP_Request->path));
 304             odr_write(o, " HTTP/", 6);
 305             odr_write(o, (*p)->u.HTTP_Request->version,
 306                       strlen((*p)->u.HTTP_Request->version));
 307             odr_write(o, "\r\n", 2);
 308             for (h = (*p)->u.HTTP_Request->headers; h; h = h->next)
 309             {
 310                 odr_write(o, h->name, strlen(h->name));
 311                 odr_write(o, ": ", 2);
 312                 odr_write(o, h->value, strlen(h->value));
 313                 odr_write(o, "\r\n", 2);
 314             }
 315             odr_write(o, "\r\n", 2);
 316             if ((*p)->u.HTTP_Request->content_buf)
 317                 odr_write(o, (*p)->u.HTTP_Request->content_buf,
 318                           (*p)->u.HTTP_Request->content_len);
 319 #if HTTP_DEBUG
 320             fprintf(stderr, "HTTP request:\n%.*s\n", o->top, o->buf);
 321 #endif
 322             break;
 323         case Z_GDU_Z3950:
 324             return z_APDU(o, &(*p)->u.z3950, opt, 0);
 325         }
 326     }
 327     else if (o->direction == ODR_PRINT)
 328     {
 329         switch((*p)->which)
 330         {
 331         case Z_GDU_HTTP_Response:
 332             fprintf (stderr, "not implemented");
 333             break;
 334         case Z_GDU_HTTP_Request:
 335             fprintf (stderr, "not implemented");
 336             break;
 337         case Z_GDU_Z3950:
 338             return z_APDU(o, &(*p)->u.z3950, opt, 0);
 339         }
 340     }
 341     return 1;
 342 }
 343