src/wps/http_client.c

   1 /*
   2  * http_client - HTTP client
   3  * Copyright (c) 2009, Jouni Malinen <j@w1.fi>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * Alternatively, this software may be distributed under the terms of BSD
  10  * license.
  11  *
  12  * See README and COPYING for more details.
  13  */
  14
  15 #include "includes.h"
  16 #include <fcntl.h>
  17
  18 #include "common.h"
  19 #include "eloop.h"
  20 #include "httpread.h"
  21 #include "http_client.h"
  22
  23
  24 #define HTTP_CLIENT_TIMEOUT_SEC 30
  25
  26
  27 struct http_client {
  28         struct sockaddr_in dst;
  29         int sd;
  30         struct wpabuf *req;
  31         size_t req_pos;
  32         size_t max_response;
  33
  34         void (*cb)(void *ctx, struct http_client *c,
  35                    enum http_client_event event);
  36         void *cb_ctx;
  37         struct httpread *hread;
  38         struct wpabuf body;
  39 };
  40
  41
  42 static void http_client_timeout(void *eloop_data, void *user_ctx)
  43 {
  44         struct http_client *c = eloop_data;
  45         wpa_printf(MSG_DEBUG, "HTTP: Timeout");
  46         c->cb(c->cb_ctx, c, HTTP_CLIENT_TIMEOUT);
  47 }
  48
  49
  50 static void http_client_got_response(struct httpread *handle, void *cookie,
  51                                      enum httpread_event e)
  52 {
  53         struct http_client *c = cookie;
  54
  55         eloop_cancel_timeout(http_client_timeout, c, NULL);
  56         switch (e) {
  57         case HTTPREAD_EVENT_FILE_READY:
  58                 if (httpread_hdr_type_get(c->hread) == HTTPREAD_HDR_TYPE_REPLY)
  59                 {
  60                         int reply_code = httpread_reply_code_get(c->hread);
  61                         if (reply_code == 200 /* OK */) {
  62                                 wpa_printf(MSG_DEBUG, "HTTP: Response OK from "
  63                                            "%s:%d",
  64                                            inet_ntoa(c->dst.sin_addr),
  65                                            ntohs(c->dst.sin_port));
  66                                 c->cb(c->cb_ctx, c, HTTP_CLIENT_OK);
  67                         } else {
  68                                 wpa_printf(MSG_DEBUG, "HTTP: Error %d from "
  69                                            "%s:%d", reply_code,
  70                                            inet_ntoa(c->dst.sin_addr),
  71                                            ntohs(c->dst.sin_port));
  72                                 c->cb(c->cb_ctx, c, HTTP_CLIENT_INVALID_REPLY);
  73                         }
  74                 } else
  75                         c->cb(c->cb_ctx, c, HTTP_CLIENT_INVALID_REPLY);
  76                 break;
  77         case HTTPREAD_EVENT_TIMEOUT:
  78                 c->cb(c->cb_ctx, c, HTTP_CLIENT_TIMEOUT);
  79                 break;
  80         case HTTPREAD_EVENT_ERROR:
  81                 c->cb(c->cb_ctx, c, HTTP_CLIENT_FAILED);
  82                 break;
  83         }
  84 }
  85
  86
  87 static void http_client_tx_ready(int sock, void *eloop_ctx, void *sock_ctx)
  88 {
  89         struct http_client *c = eloop_ctx;
  90         int res;
  91
  92         wpa_printf(MSG_DEBUG, "HTTP: Send client request to %s:%d (%lu of %lu "
  93                    "bytes remaining)",
  94                    inet_ntoa(c->dst.sin_addr), ntohs(c->dst.sin_port),
  95                    (unsigned long) wpabuf_len(c->req),
  96                    (unsigned long) wpabuf_len(c->req) - c->req_pos);
  97
  98         res = send(c->sd, wpabuf_head(c->req) + c->req_pos,
  99                    wpabuf_len(c->req) - c->req_pos, 0);
 100         if (res < 0) {
 101                 wpa_printf(MSG_DEBUG, "HTTP: Failed to send buffer: %s",
 102                            strerror(errno));
 103                 eloop_unregister_sock(c->sd, EVENT_TYPE_WRITE);
 104                 c->cb(c->cb_ctx, c, HTTP_CLIENT_FAILED);
 105                 return;
 106         }
 107
 108         if ((size_t) res < wpabuf_len(c->req) - c->req_pos) {
 109                 wpa_printf(MSG_DEBUG, "HTTP: Sent %d of %lu bytes; %lu bytes "
 110                            "remaining",
 111                            res, (unsigned long) wpabuf_len(c->req),
 112                            (unsigned long) wpabuf_len(c->req) - c->req_pos -
 113                            res);
 114                 c->req_pos += res;
 115                 return;
 116         }
 117
 118         wpa_printf(MSG_DEBUG, "HTTP: Full client request sent to %s:%d",
 119                    inet_ntoa(c->dst.sin_addr), ntohs(c->dst.sin_port));
 120         eloop_unregister_sock(c->sd, EVENT_TYPE_WRITE);
 121         wpabuf_free(c->req);
 122         c->req = NULL;
 123
 124         c->hread = httpread_create(c->sd, http_client_got_response, c,
 125                                    c->max_response, HTTP_CLIENT_TIMEOUT_SEC);
 126         if (c->hread == NULL) {
 127                 c->cb(c->cb_ctx, c, HTTP_CLIENT_FAILED);
 128                 return;
 129         }
 130 }
 131
 132
 133 struct http_client * http_client_addr(struct sockaddr_in *dst,
 134                                       struct wpabuf *req, size_t max_response,
 135                                       void (*cb)(void *ctx,
 136                                                  struct http_client *c,
 137                                                  enum http_client_event event),
 138                                       void *cb_ctx)
 139 {
 140         struct http_client *c;
 141
 142         c = os_zalloc(sizeof(*c));
 143         if (c == NULL)
 144                 return NULL;
 145         c->sd = -1;
 146         c->dst = *dst;
 147         c->max_response = max_response;
 148         c->cb = cb;
 149         c->cb_ctx = cb_ctx;
 150
 151         c->sd = socket(AF_INET, SOCK_STREAM, 0);
 152         if (c->sd < 0) {
 153                 http_client_free(c);
 154                 return NULL;
 155         }
 156
 157         if (fcntl(c->sd, F_SETFL, O_NONBLOCK) != 0) {
 158                 wpa_printf(MSG_DEBUG, "HTTP: fnctl(O_NONBLOCK) failed: %s",
 159                            strerror(errno));
 160                 http_client_free(c);
 161                 return NULL;
 162         }
 163
 164         if (connect(c->sd, (struct sockaddr *) dst, sizeof(*dst))) {
 165                 if (errno != EINPROGRESS) {
 166                         wpa_printf(MSG_DEBUG, "HTTP: Failed to connect: %s",
 167                                    strerror(errno));
 168                         http_client_free(c);
 169                         return NULL;
 170                 }
 171
 172                 /*
 173                  * Continue connecting in the background; eloop will call us
 174                  * once the connection is ready (or failed).
 175                  */
 176         }
 177
 178         if (eloop_register_sock(c->sd, EVENT_TYPE_WRITE, http_client_tx_ready,
 179                                 c, NULL)) {
 180                 http_client_free(c);
 181                 return NULL;
 182         }
 183
 184         if (eloop_register_timeout(HTTP_CLIENT_TIMEOUT_SEC, 0,
 185                                    http_client_timeout, c, NULL)) {
 186                 http_client_free(c);
 187                 return NULL;
 188         }
 189
 190         c->req = req;
 191
 192         return c;
 193 }
 194
 195
 196 char * http_client_url_parse(const char *url, struct sockaddr_in *dst,
 197                              char **ret_path)
 198 {
 199         char *u, *addr, *port, *path;
 200
 201         u = os_strdup(url);
 202         if (u == NULL)
 203                 return NULL;
 204
 205         os_memset(dst, 0, sizeof(*dst));
 206         dst->sin_family = AF_INET;
 207         addr = u + 7;
 208         path = os_strchr(addr, '/');
 209         port = os_strchr(addr, ':');
 210         if (path == NULL) {
 211                 path = "/";
 212         } else {
 213                 *path = '\0'; /* temporary nul termination for address */
 214                 if (port > path)
 215                         port = NULL;
 216         }
 217         if (port)
 218                 *port++ = '\0';
 219
 220         if (inet_aton(addr, &dst->sin_addr) == 0) {
 221                 /* TODO: name lookup */
 222                 wpa_printf(MSG_DEBUG, "HTTP: Unsupported address in URL '%s' "
 223                            "(addr='%s' port='%s')",
 224                            url, addr, port);
 225                 os_free(u);
 226                 return NULL;
 227         }
 228
 229         if (port)
 230                 dst->sin_port = htons(atoi(port));
 231         else
 232                 dst->sin_port = htons(80);
 233
 234         if (*path == '\0') {
 235                 /* remove temporary nul termination for address */
 236                 *path = '/';
 237         }
 238
 239         *ret_path = path;
 240
 241         return u;
 242 }
 243
 244
 245 struct http_client * http_client_url(const char *url,
 246                                      struct wpabuf *req, size_t max_response,
 247                                      void (*cb)(void *ctx,
 248                                                 struct http_client *c,
 249                                                 enum http_client_event event),
 250                                      void *cb_ctx)
 251 {
 252         struct sockaddr_in dst;
 253         struct http_client *c;
 254         char *u, *path;
 255         struct wpabuf *req_buf = NULL;
 256
 257         if (os_strncmp(url, "http://", 7) != 0)
 258                 return NULL;
 259         u = http_client_url_parse(url, &dst, &path);
 260         if (u == NULL)
 261                 return NULL;
 262
 263         if (req == NULL) {
 264                 req_buf = wpabuf_alloc(os_strlen(url) + 1000);
 265                 if (req_buf == NULL) {
 266                         os_free(u);
 267                         return NULL;
 268                 }
 269                 req = req_buf;
 270                 wpabuf_printf(req,
 271                               "GET %s HTTP/1.1\r\n"
 272                               "Cache-Control: no-cache\r\n"
 273                               "Pragma: no-cache\r\n"
 274                               "Accept: text/xml, application/xml\r\n"
 275                               "User-Agent: wpa_supplicant\r\n"
 276                               "Host: %s:%d\r\n"
 277                               "\r\n",
 278                               path, inet_ntoa(dst.sin_addr),
 279                               ntohs(dst.sin_port));
 280         }
 281         os_free(u);
 282
 283         c = http_client_addr(&dst, req, max_response, cb, cb_ctx);
 284         if (c == NULL) {
 285                 wpabuf_free(req_buf);
 286                 return NULL;
 287         }
 288
 289         return c;
 290 }
 291
 292
 293 void http_client_free(struct http_client *c)
 294 {
 295         if (c == NULL)
 296                 return;
 297         httpread_destroy(c->hread);
 298         wpabuf_free(c->req);
 299         if (c->sd >= 0) {
 300                 eloop_unregister_sock(c->sd, EVENT_TYPE_WRITE);
 301                 close(c->sd);
 302         }
 303         eloop_cancel_timeout(http_client_timeout, c, NULL);
 304         os_free(c);
 305 }
 306
 307
 308 struct wpabuf * http_client_get_body(struct http_client *c)
 309 {
 310         if (c->hread == NULL)
 311                 return NULL;
 312         wpabuf_set(&c->body, httpread_data_get(c->hread),
 313                    httpread_length_get(c->hread));
 314         return &c->body;
 315 }
 316
 317
 318 char * http_client_get_hdr_line(struct http_client *c, const char *tag)
 319 {
 320         if (c->hread == NULL)
 321                 return NULL;
 322         return httpread_hdr_line_get(c->hread, tag);
 323 }
 324
 325
 326 char * http_link_update(char *url, const char *base)
 327 {
 328         char *n;
 329         size_t len;
 330         const char *pos;
 331
 332         /* RFC 2396, Chapter 5.2 */
 333         /* TODO: consider adding all cases described in RFC 2396 */
 334
 335         if (url == NULL)
 336                 return NULL;
 337
 338         if (os_strncmp(url, "http://", 7) == 0)
 339                 return url; /* absolute link */
 340
 341         if (os_strncmp(base, "http://", 7) != 0)
 342                 return url; /* unable to handle base URL */
 343
 344         len = os_strlen(url) + 1 + os_strlen(base) + 1;
 345         n = os_malloc(len);
 346         if (n == NULL)
 347                 return url; /* failed */
 348
 349         if (url[0] == '/') {
 350                 pos = os_strchr(base + 7, '/');
 351                 if (pos == NULL) {
 352                         os_snprintf(n, len, "%s%s", base, url);
 353                 } else {
 354                         os_memcpy(n, base, pos - base);
 355                         os_memcpy(n + (pos - base), url, os_strlen(url) + 1);
 356                 }
 357         } else {
 358                 pos = os_strrchr(base + 7, '/');
 359                 if (pos == NULL) {
 360                         os_snprintf(n, len, "%s/%s", base, url);
 361                 } else {
 362                         os_memcpy(n, base, pos - base + 1);
 363                         os_memcpy(n + (pos - base) + 1, url, os_strlen(url) +
 364                                   1);
 365                 }
 366         }
 367
 368         os_free(url);
 369
 370         return n;
 371 }