uclient-http.c

   1 /*
   2  * uclient - ustream based protocol client library
   3  *
   4  * Copyright (C) 2014 Felix Fietkau <nbd@openwrt.org>
   5  *
   6  * Permission to use, copy, modify, and/or distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18 #include <stdio.h>
  19 #include <ctype.h>
  20 #include <unistd.h>
  21 #include <stdint.h>
  22
  23 #include <libubox/ustream.h>
  24 #include <libubox/ustream-ssl.h>
  25 #include <libubox/usock.h>
  26 #include <libubox/blobmsg.h>
  27
  28 #include "uclient.h"
  29 #include "uclient-utils.h"
  30 #include "uclient-backend.h"
  31
  32 enum auth_type {
  33         AUTH_TYPE_UNKNOWN,
  34         AUTH_TYPE_NONE,
  35         AUTH_TYPE_BASIC,
  36         AUTH_TYPE_DIGEST,
  37 };
  38
  39 enum request_type {
  40         REQ_GET,
  41         REQ_HEAD,
  42         REQ_POST,
  43         REQ_PUT,
  44         REQ_DELETE,
  45         __REQ_MAX
  46 };
  47
  48 enum http_state {
  49         HTTP_STATE_INIT,
  50         HTTP_STATE_HEADERS_SENT,
  51         HTTP_STATE_REQUEST_DONE,
  52         HTTP_STATE_RECV_HEADERS,
  53         HTTP_STATE_RECV_DATA,
  54         HTTP_STATE_ERROR,
  55 };
  56
  57 static const char * const request_types[__REQ_MAX] = {
  58         [REQ_GET] = "GET",
  59         [REQ_HEAD] = "HEAD",
  60         [REQ_POST] = "POST",
  61         [REQ_PUT] = "PUT",
  62         [REQ_DELETE] = "DELETE",
  63 };
  64
  65 struct uclient_http {
  66         struct uclient uc;
  67
  68         const struct ustream_ssl_ops *ssl_ops;
  69         struct ustream_ssl_ctx *ssl_ctx;
  70         struct ustream *us;
  71
  72         struct ustream_fd ufd;
  73         struct ustream_ssl ussl;
  74
  75         struct uloop_timeout disconnect_t;
  76         unsigned int seq;
  77
  78         bool ssl_require_validation;
  79         bool ssl;
  80         bool eof;
  81         bool connection_close;
  82         bool disconnect;
  83         enum request_type req_type;
  84         enum http_state state;
  85
  86         enum auth_type auth_type;
  87         char *auth_str;
  88
  89         long read_chunked;
  90         long content_length;
  91
  92         uint32_t nc;
  93
  94         struct blob_buf headers;
  95         struct blob_buf meta;
  96 };
  97
  98 enum {
  99         PREFIX_HTTP,
 100         PREFIX_HTTPS,
 101         __PREFIX_MAX,
 102 };
 103
 104 static const char * const uclient_http_prefix[] = {
 105         [PREFIX_HTTP] = "http://",
 106         [PREFIX_HTTPS] = "https://",
 107         [__PREFIX_MAX] = NULL
 108 };
 109
 110 static int uclient_do_connect(struct uclient_http *uh, const char *port)
 111 {
 112         socklen_t sl;
 113         int fd;
 114
 115         if (uh->uc.url->port)
 116                 port = uh->uc.url->port;
 117
 118         fd = usock(USOCK_TCP | USOCK_NONBLOCK, uh->uc.url->host, port);
 119         if (fd < 0)
 120                 return -1;
 121
 122         ustream_fd_init(&uh->ufd, fd);
 123
 124         memset(&uh->uc.local_addr, 0, sizeof(uh->uc.local_addr));
 125         memset(&uh->uc.remote_addr, 0, sizeof(uh->uc.remote_addr));
 126
 127         sl = sizeof(uh->uc.local_addr);
 128         getsockname(fd, &uh->uc.local_addr.sa, &sl);
 129         getpeername(fd, &uh->uc.remote_addr.sa, &sl);
 130
 131         return 0;
 132 }
 133
 134 static void uclient_http_disconnect(struct uclient_http *uh)
 135 {
 136         uloop_timeout_cancel(&uh->disconnect_t);
 137         if (!uh->us)
 138                 return;
 139
 140         if (uh->ssl)
 141                 ustream_free(&uh->ussl.stream);
 142         ustream_free(&uh->ufd.stream);
 143         close(uh->ufd.fd.fd);
 144         uh->us = NULL;
 145 }
 146
 147 static void uclient_http_free_url_state(struct uclient *cl)
 148 {
 149         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 150
 151         uh->auth_type = AUTH_TYPE_UNKNOWN;
 152         free(uh->auth_str);
 153         uh->auth_str = NULL;
 154         uclient_http_disconnect(uh);
 155 }
 156
 157 static void uclient_http_error(struct uclient_http *uh, int code)
 158 {
 159         uh->state = HTTP_STATE_ERROR;
 160         uh->us->eof = true;
 161         ustream_state_change(uh->us);
 162         uclient_backend_set_error(&uh->uc, code);
 163 }
 164
 165 static void uclient_http_request_disconnect(struct uclient *cl)
 166 {
 167         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 168
 169         if (!uh->us)
 170                 return;
 171
 172         uh->eof = true;
 173         uh->disconnect = true;
 174         uloop_timeout_set(&uh->disconnect_t, 1);
 175 }
 176
 177 static void uclient_notify_eof(struct uclient_http *uh)
 178 {
 179         struct ustream *us = uh->us;
 180
 181         if (uh->disconnect)
 182                 return;
 183
 184         if (!uh->eof) {
 185                 if (!us->eof && !us->write_error)
 186                         return;
 187
 188                 if (ustream_pending_data(us, false))
 189                         return;
 190         }
 191
 192         uclient_backend_set_eof(&uh->uc);
 193
 194         if (uh->connection_close)
 195                 uclient_http_request_disconnect(&uh->uc);
 196 }
 197
 198 static void uclient_http_reset_state(struct uclient_http *uh)
 199 {
 200         uh->seq++;
 201         uclient_backend_reset_state(&uh->uc);
 202         uh->read_chunked = -1;
 203         uh->content_length = -1;
 204         uh->eof = false;
 205         uh->disconnect = false;
 206         uh->connection_close = false;
 207         uh->state = HTTP_STATE_INIT;
 208
 209         if (uh->auth_type == AUTH_TYPE_UNKNOWN && !uh->uc.url->auth)
 210                 uh->auth_type = AUTH_TYPE_NONE;
 211 }
 212
 213 static void uclient_http_init_request(struct uclient_http *uh)
 214 {
 215         uclient_http_reset_state(uh);
 216         blob_buf_init(&uh->meta, 0);
 217 }
 218
 219 static enum auth_type
 220 uclient_http_update_auth_type(struct uclient_http *uh)
 221 {
 222         if (!uh->auth_str)
 223                 return AUTH_TYPE_NONE;
 224
 225         if (!strncasecmp(uh->auth_str, "basic", 5))
 226                 return AUTH_TYPE_BASIC;
 227
 228         if (!strncasecmp(uh->auth_str, "digest", 6))
 229                 return AUTH_TYPE_DIGEST;
 230
 231         return AUTH_TYPE_NONE;
 232 }
 233
 234 static void uclient_http_process_headers(struct uclient_http *uh)
 235 {
 236         enum {
 237                 HTTP_HDR_TRANSFER_ENCODING,
 238                 HTTP_HDR_CONNECTION,
 239                 HTTP_HDR_CONTENT_LENGTH,
 240                 HTTP_HDR_AUTH,
 241                 __HTTP_HDR_MAX,
 242         };
 243         static const struct blobmsg_policy hdr_policy[__HTTP_HDR_MAX] = {
 244 #define hdr(_name) { .name = _name, .type = BLOBMSG_TYPE_STRING }
 245                 [HTTP_HDR_TRANSFER_ENCODING] = hdr("transfer-encoding"),
 246                 [HTTP_HDR_CONNECTION] = hdr("connection"),
 247                 [HTTP_HDR_CONTENT_LENGTH] = hdr("content-length"),
 248                 [HTTP_HDR_AUTH] = hdr("www-authenticate"),
 249 #undef hdr
 250         };
 251         struct blob_attr *tb[__HTTP_HDR_MAX];
 252         struct blob_attr *cur;
 253
 254         blobmsg_parse(hdr_policy, __HTTP_HDR_MAX, tb, blob_data(uh->meta.head), blob_len(uh->meta.head));
 255
 256         cur = tb[HTTP_HDR_TRANSFER_ENCODING];
 257         if (cur && strstr(blobmsg_data(cur), "chunked"))
 258                 uh->read_chunked = 0;
 259
 260         cur = tb[HTTP_HDR_CONNECTION];
 261         if (cur && strstr(blobmsg_data(cur), "close"))
 262                 uh->connection_close = true;
 263
 264         cur = tb[HTTP_HDR_CONTENT_LENGTH];
 265         if (cur)
 266                 uh->content_length = strtoul(blobmsg_data(cur), NULL, 10);
 267
 268         cur = tb[HTTP_HDR_AUTH];
 269         if (cur) {
 270                 free(uh->auth_str);
 271                 uh->auth_str = strdup(blobmsg_data(cur));
 272         }
 273
 274         uh->auth_type = uclient_http_update_auth_type(uh);
 275 }
 276
 277 static void
 278 uclient_http_add_auth_basic(struct uclient_http *uh)
 279 {
 280         struct uclient_url *url = uh->uc.url;
 281         int auth_len = strlen(url->auth);
 282         char *auth_buf;
 283
 284         if (auth_len > 512)
 285                 return;
 286
 287         auth_buf = alloca(base64_len(auth_len) + 1);
 288         base64_encode(url->auth, auth_len, auth_buf);
 289         ustream_printf(uh->us, "Authorization: Basic %s\r\n", auth_buf);
 290 }
 291
 292 static char *digest_unquote_sep(char **str)
 293 {
 294         char *cur = *str + 1;
 295         char *start = cur;
 296         char *out;
 297
 298         if (**str != '"')
 299                 return NULL;
 300
 301         out = cur;
 302         while (1) {
 303                 if (!*cur)
 304                         return NULL;
 305
 306                 if (*cur == '"') {
 307                         cur++;
 308                         break;
 309                 }
 310
 311                 if (*cur == '\\')
 312                         cur++;
 313
 314                 *(out++) = *(cur++);
 315         }
 316
 317         if (*cur == ',')
 318                 cur++;
 319
 320         *out = 0;
 321         *str = cur;
 322
 323         return start;
 324 }
 325
 326 static char *digest_sep(char **str)
 327 {
 328         char *cur, *next;
 329
 330         cur = *str;
 331         next = strchr(*str, ',');
 332         if (next) {
 333             *str = next + 1;
 334             *next = 0;
 335         } else {
 336             *str += strlen(*str);
 337         }
 338
 339         return cur;
 340 }
 341
 342 static bool strmatch(char **str, const char *prefix)
 343 {
 344         int len = strlen(prefix);
 345
 346         if (strncmp(*str, prefix, len) != 0 || (*str)[len] != '=')
 347                 return false;
 348
 349         *str += len + 1;
 350         return true;
 351 }
 352
 353 static void
 354 get_cnonce(char *dest)
 355 {
 356         uint32_t val = 0;
 357         FILE *f;
 358
 359         f = fopen("/dev/urandom", "r");
 360         if (f) {
 361                 fread(&val, sizeof(val), 1, f);
 362                 fclose(f);
 363         }
 364
 365         bin_to_hex(dest, &val, sizeof(val));
 366 }
 367
 368 static void add_field(char **buf, int *ofs, int *len, const char *name, const char *val)
 369 {
 370         int available = *len - *ofs;
 371         int required;
 372         const char *next;
 373         char *cur;
 374
 375         if (*len && !*buf)
 376                 return;
 377
 378         required = strlen(name) + 4 + strlen(val) * 2;
 379         if (required > available)
 380                 *len += required - available + 64;
 381
 382         *buf = realloc(*buf, *len);
 383         if (!*buf)
 384                 return;
 385
 386         cur = *buf + *ofs;
 387         cur += sprintf(cur, ", %s=\"", name);
 388
 389         while ((next = strchr(val, '"'))) {
 390                 if (next > val) {
 391                         memcpy(cur, val, next - val);
 392                         cur += next - val;
 393                 }
 394
 395                 cur += sprintf(cur, "\\\"");
 396                 val = next + 1;
 397         }
 398
 399         cur += sprintf(cur, "%s\"", val);
 400         *ofs = cur - *buf;
 401 }
 402
 403 static void
 404 uclient_http_add_auth_digest(struct uclient_http *uh)
 405 {
 406         struct uclient_url *url = uh->uc.url;
 407         const char *realm = NULL, *opaque = NULL;
 408         const char *user, *password;
 409         char *buf, *next;
 410         int len, ofs;
 411
 412         char cnonce_str[9];
 413         char nc_str[9];
 414         char ahash[33];
 415         char hash[33];
 416
 417         struct http_digest_data data = {
 418                 .nc = nc_str,
 419                 .cnonce = cnonce_str,
 420                 .auth_hash = ahash,
 421         };
 422
 423         len = strlen(uh->auth_str) + 1;
 424         if (len > 512)
 425                 return;
 426
 427         buf = alloca(len);
 428         strcpy(buf, uh->auth_str);
 429
 430         /* skip auth type */
 431         strsep(&buf, " ");
 432
 433         next = buf;
 434         while (*next) {
 435                 const char **dest = NULL;
 436                 const char *tmp;
 437
 438                 while (*next && isspace(*next))
 439                         next++;
 440
 441                 if (strmatch(&next, "realm"))
 442                         dest = &realm;
 443                 else if (strmatch(&next, "qop"))
 444                         dest = &data.qop;
 445                 else if (strmatch(&next, "nonce"))
 446                         dest = &data.nonce;
 447                 else if (strmatch(&next, "opaque"))
 448                         dest = &opaque;
 449                 else if (strmatch(&next, "stale") ||
 450                          strmatch(&next, "algorithm") ||
 451                          strmatch(&next, "auth-param")) {
 452                         digest_sep(&next);
 453                         continue;
 454                 } else if (strmatch(&next, "domain") ||
 455                          strmatch(&next, "qop-options"))
 456                         dest = &tmp;
 457                 else {
 458                         digest_sep(&next);
 459                         continue;
 460                 }
 461
 462                 *dest = digest_unquote_sep(&next);
 463         }
 464
 465         if (!realm || !data.qop || !data.nonce)
 466                 return;
 467
 468         sprintf(nc_str, "%08x", uh->nc++);
 469         get_cnonce(cnonce_str);
 470
 471         data.qop = "auth";
 472         data.uri = url->location;
 473         data.method = request_types[uh->req_type];
 474
 475         password = strchr(url->auth, ':');
 476         if (password) {
 477                 char *user_buf;
 478
 479                 len = password - url->auth;
 480                 if (len > 256)
 481                         return;
 482
 483                 user_buf = alloca(len + 1);
 484                 strncpy(user_buf, url->auth, len);
 485                 user_buf[len] = 0;
 486                 user = user_buf;
 487                 password++;
 488         } else {
 489                 user = url->auth;
 490                 password = "";
 491         }
 492
 493         http_digest_calculate_auth_hash(ahash, user, realm, password);
 494         http_digest_calculate_response(hash, &data);
 495
 496         buf = NULL;
 497         len = 0;
 498         ofs = 0;
 499
 500         add_field(&buf, &ofs, &len, "username", user);
 501         add_field(&buf, &ofs, &len, "realm", realm);
 502         add_field(&buf, &ofs, &len, "nonce", data.nonce);
 503         add_field(&buf, &ofs, &len, "uri", data.uri);
 504         add_field(&buf, &ofs, &len, "cnonce", data.cnonce);
 505         add_field(&buf, &ofs, &len, "response", hash);
 506         if (opaque)
 507                 add_field(&buf, &ofs, &len, "opaque", opaque);
 508
 509         ustream_printf(uh->us, "Authorization: Digest nc=%s, qop=%s%s\r\n", data.nc, data.qop, buf);
 510         free(buf);
 511 }
 512
 513 static void
 514 uclient_http_add_auth_header(struct uclient_http *uh)
 515 {
 516         if (!uh->uc.url->auth)
 517                 return;
 518
 519         switch (uh->auth_type) {
 520         case AUTH_TYPE_UNKNOWN:
 521         case AUTH_TYPE_NONE:
 522                 break;
 523         case AUTH_TYPE_BASIC:
 524                 uclient_http_add_auth_basic(uh);
 525                 break;
 526         case AUTH_TYPE_DIGEST:
 527                 uclient_http_add_auth_digest(uh);
 528                 break;
 529         }
 530 }
 531
 532 static void
 533 uclient_http_send_headers(struct uclient_http *uh)
 534 {
 535         struct uclient_url *url = uh->uc.url;
 536         struct blob_attr *cur;
 537         enum request_type req_type = uh->req_type;
 538         int rem;
 539
 540         if (uh->state >= HTTP_STATE_HEADERS_SENT)
 541                 return;
 542
 543         ustream_printf(uh->us,
 544                 "%s %s HTTP/1.1\r\n"
 545                 "Host: %s\r\n",
 546                 request_types[req_type],
 547                 url->location, url->host);
 548
 549         blobmsg_for_each_attr(cur, uh->headers.head, rem)
 550                 ustream_printf(uh->us, "%s: %s\r\n", blobmsg_name(cur), (char *) blobmsg_data(cur));
 551
 552         if (uh->req_type == REQ_POST || uh->req_type == REQ_PUT)
 553                 ustream_printf(uh->us, "Transfer-Encoding: chunked\r\n");
 554
 555         uclient_http_add_auth_header(uh);
 556
 557         ustream_printf(uh->us, "\r\n");
 558
 559         uh->state = HTTP_STATE_HEADERS_SENT;
 560 }
 561
 562 static void uclient_http_headers_complete(struct uclient_http *uh)
 563 {
 564         enum auth_type auth_type = uh->auth_type;
 565
 566         uh->state = HTTP_STATE_RECV_DATA;
 567         uh->uc.meta = uh->meta.head;
 568         uclient_http_process_headers(uh);
 569
 570         if (auth_type == AUTH_TYPE_UNKNOWN && uh->uc.status_code == 401 &&
 571             (uh->req_type == REQ_HEAD || uh->req_type == REQ_GET)) {
 572                 uclient_http_init_request(uh);
 573                 uclient_http_send_headers(uh);
 574                 uh->state = HTTP_STATE_REQUEST_DONE;
 575                 return;
 576         }
 577
 578         if (uh->uc.cb->header_done)
 579                 uh->uc.cb->header_done(&uh->uc);
 580
 581         if (uh->eof)
 582                 return;
 583
 584         if (uh->req_type == REQ_HEAD || uh->uc.status_code == 204) {
 585                 uh->eof = true;
 586                 uclient_notify_eof(uh);
 587         }
 588 }
 589
 590 static void uclient_parse_http_line(struct uclient_http *uh, char *data)
 591 {
 592         char *name;
 593         char *sep;
 594
 595         if (uh->state == HTTP_STATE_REQUEST_DONE) {
 596                 char *code;
 597
 598                 if (!strlen(data))
 599                         return;
 600
 601                 /* HTTP/1.1 */
 602                 strsep(&data, " ");
 603
 604                 code = strsep(&data, " ");
 605                 if (!code)
 606                         goto error;
 607
 608                 uh->uc.status_code = strtoul(code, &sep, 10);
 609                 if (sep && *sep)
 610                         goto error;
 611
 612                 uh->state = HTTP_STATE_RECV_HEADERS;
 613                 return;
 614         }
 615
 616         if (!*data) {
 617                 uclient_http_headers_complete(uh);
 618                 return;
 619         }
 620
 621         sep = strchr(data, ':');
 622         if (!sep)
 623                 return;
 624
 625         *(sep++) = 0;
 626
 627         for (name = data; *name; name++)
 628                 *name = tolower(*name);
 629
 630         name = data;
 631         while (isspace(*sep))
 632                 sep++;
 633
 634         blobmsg_add_string(&uh->meta, name, sep);
 635         return;
 636
 637 error:
 638         uh->uc.status_code = 400;
 639         uh->eof = true;
 640         uclient_notify_eof(uh);
 641 }
 642
 643 static void __uclient_notify_read(struct uclient_http *uh)
 644 {
 645         struct uclient *uc = &uh->uc;
 646         unsigned int seq = uh->seq;
 647         char *data;
 648         int len;
 649
 650         if (uh->state < HTTP_STATE_REQUEST_DONE || uh->state == HTTP_STATE_ERROR)
 651                 return;
 652
 653         data = ustream_get_read_buf(uh->us, &len);
 654         if (!data || !len)
 655                 return;
 656
 657         if (uh->state < HTTP_STATE_RECV_DATA) {
 658                 char *sep;
 659                 int cur_len;
 660
 661                 do {
 662                         sep = strstr(data, "\r\n");
 663                         if (!sep)
 664                                 break;
 665
 666                         /* Check for multi-line HTTP headers */
 667                         if (sep > data) {
 668                                 if (!sep[2])
 669                                         return;
 670
 671                                 if (isspace(sep[2]) && sep[2] != '\r') {
 672                                         sep[0] = ' ';
 673                                         sep[1] = ' ';
 674                                         continue;
 675                                 }
 676                         }
 677
 678                         *sep = 0;
 679                         cur_len = sep + 2 - data;
 680                         uclient_parse_http_line(uh, data);
 681                         if (seq != uh->seq)
 682                                 return;
 683
 684                         ustream_consume(uh->us, cur_len);
 685                         len -= cur_len;
 686
 687                         if (uh->eof)
 688                                 return;
 689
 690                         data = ustream_get_read_buf(uh->us, &len);
 691                 } while (data && uh->state < HTTP_STATE_RECV_DATA);
 692
 693                 if (!len)
 694                         return;
 695         }
 696
 697         if (uh->eof)
 698                 return;
 699
 700         if (uh->state == HTTP_STATE_RECV_DATA) {
 701                 /* Now it's uclient user turn to read some data */
 702                 uloop_timeout_cancel(&uc->connection_timeout);
 703
 704                 if (uc->cb->data_read)
 705                         uc->cb->data_read(uc);
 706         }
 707 }
 708
 709 static void __uclient_notify_write(struct uclient_http *uh)
 710 {
 711         struct uclient *uc = &uh->uc;
 712
 713         if (uc->cb->data_sent)
 714                 uc->cb->data_sent(uc);
 715 }
 716
 717 static void uclient_notify_read(struct ustream *us, int bytes)
 718 {
 719         struct uclient_http *uh = container_of(us, struct uclient_http, ufd.stream);
 720
 721         __uclient_notify_read(uh);
 722 }
 723
 724 static void uclient_notify_write(struct ustream *us, int bytes)
 725 {
 726         struct uclient_http *uh = container_of(us, struct uclient_http, ufd.stream);
 727
 728         __uclient_notify_write(uh);
 729 }
 730
 731 static void uclient_notify_state(struct ustream *us)
 732 {
 733         struct uclient_http *uh = container_of(us, struct uclient_http, ufd.stream);
 734
 735         uclient_notify_eof(uh);
 736 }
 737
 738 static int uclient_setup_http(struct uclient_http *uh)
 739 {
 740         struct ustream *us = &uh->ufd.stream;
 741         int ret;
 742
 743         uh->us = us;
 744         uh->ssl = false;
 745
 746         us->string_data = true;
 747         us->notify_state = uclient_notify_state;
 748         us->notify_read = uclient_notify_read;
 749         us->notify_write = uclient_notify_write;
 750
 751         ret = uclient_do_connect(uh, "80");
 752         if (ret)
 753                 return UCLIENT_ERROR_CONNECT;
 754
 755         return 0;
 756 }
 757
 758 static void uclient_ssl_notify_read(struct ustream *us, int bytes)
 759 {
 760         struct uclient_http *uh = container_of(us, struct uclient_http, ussl.stream);
 761
 762         __uclient_notify_read(uh);
 763 }
 764
 765 static void uclient_ssl_notify_write(struct ustream *us, int bytes)
 766 {
 767         struct uclient_http *uh = container_of(us, struct uclient_http, ussl.stream);
 768
 769         __uclient_notify_write(uh);
 770 }
 771
 772 static void uclient_ssl_notify_state(struct ustream *us)
 773 {
 774         struct uclient_http *uh = container_of(us, struct uclient_http, ussl.stream);
 775
 776         uclient_notify_eof(uh);
 777 }
 778
 779 static void uclient_ssl_notify_error(struct ustream_ssl *ssl, int error, const char *str)
 780 {
 781         struct uclient_http *uh = container_of(ssl, struct uclient_http, ussl);
 782
 783         uclient_http_error(uh, UCLIENT_ERROR_CONNECT);
 784 }
 785
 786 static void uclient_ssl_notify_verify_error(struct ustream_ssl *ssl, int error, const char *str)
 787 {
 788         struct uclient_http *uh = container_of(ssl, struct uclient_http, ussl);
 789
 790         if (!uh->ssl_require_validation)
 791                 return;
 792
 793         uclient_http_error(uh, UCLIENT_ERROR_SSL_INVALID_CERT);
 794 }
 795
 796 static void uclient_ssl_notify_connected(struct ustream_ssl *ssl)
 797 {
 798         struct uclient_http *uh = container_of(ssl, struct uclient_http, ussl);
 799
 800         if (!uh->ssl_require_validation)
 801                 return;
 802
 803         if (!uh->ussl.valid_cn)
 804                 uclient_http_error(uh, UCLIENT_ERROR_SSL_CN_MISMATCH);
 805 }
 806
 807 static int uclient_setup_https(struct uclient_http *uh)
 808 {
 809         struct ustream *us = &uh->ussl.stream;
 810         int ret;
 811
 812         uh->ssl = true;
 813         uh->us = us;
 814
 815         if (!uh->ssl_ctx)
 816                 return UCLIENT_ERROR_MISSING_SSL_CONTEXT;
 817
 818         ret = uclient_do_connect(uh, "443");
 819         if (ret)
 820                 return UCLIENT_ERROR_CONNECT;
 821
 822         us->string_data = true;
 823         us->notify_state = uclient_ssl_notify_state;
 824         us->notify_read = uclient_ssl_notify_read;
 825         us->notify_write = uclient_ssl_notify_write;
 826         uh->ussl.notify_error = uclient_ssl_notify_error;
 827         uh->ussl.notify_verify_error = uclient_ssl_notify_verify_error;
 828         uh->ussl.notify_connected = uclient_ssl_notify_connected;
 829         uh->ussl.server_name = uh->uc.url->host;
 830         uh->ssl_ops->init(&uh->ussl, &uh->ufd.stream, uh->ssl_ctx, false);
 831         uh->ssl_ops->set_peer_cn(&uh->ussl, uh->uc.url->host);
 832
 833         return 0;
 834 }
 835
 836 static int uclient_http_connect(struct uclient *cl)
 837 {
 838         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 839         int ret;
 840
 841         if (!cl->eof || uh->disconnect)
 842                 uclient_http_disconnect(uh);
 843
 844         uclient_http_init_request(uh);
 845
 846         if (uh->us)
 847                 return 0;
 848
 849         uh->ssl = cl->url->prefix == PREFIX_HTTPS;
 850
 851         if (uh->ssl)
 852                 ret = uclient_setup_https(uh);
 853         else
 854                 ret = uclient_setup_http(uh);
 855
 856         return ret;
 857 }
 858
 859 static void uclient_http_disconnect_cb(struct uloop_timeout *timeout)
 860 {
 861         struct uclient_http *uh = container_of(timeout, struct uclient_http, disconnect_t);
 862
 863         uclient_http_disconnect(uh);
 864 }
 865
 866 static struct uclient *uclient_http_alloc(void)
 867 {
 868         struct uclient_http *uh;
 869
 870         uh = calloc_a(sizeof(*uh));
 871         uh->disconnect_t.cb = uclient_http_disconnect_cb;
 872         blob_buf_init(&uh->headers, 0);
 873
 874         return &uh->uc;
 875 }
 876
 877 static void uclient_http_free_ssl_ctx(struct uclient_http *uh)
 878 {
 879         uh->ssl_ops = NULL;
 880         uh->ssl_ctx = NULL;
 881 }
 882
 883 static void uclient_http_free(struct uclient *cl)
 884 {
 885         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 886
 887         uclient_http_free_url_state(cl);
 888         uclient_http_free_ssl_ctx(uh);
 889         blob_buf_free(&uh->headers);
 890         blob_buf_free(&uh->meta);
 891         free(uh);
 892 }
 893
 894 int
 895 uclient_http_set_request_type(struct uclient *cl, const char *type)
 896 {
 897         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 898         int i;
 899
 900         if (cl->backend != &uclient_backend_http)
 901                 return -1;
 902
 903         if (uh->state > HTTP_STATE_INIT)
 904                 return -1;
 905
 906         for (i = 0; i < ARRAY_SIZE(request_types); i++) {
 907                 if (strcmp(request_types[i], type) != 0)
 908                         continue;
 909
 910                 uh->req_type = i;
 911                 return 0;
 912         }
 913
 914         return -1;
 915 }
 916
 917 int
 918 uclient_http_reset_headers(struct uclient *cl)
 919 {
 920         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 921
 922         blob_buf_init(&uh->headers, 0);
 923
 924         return 0;
 925 }
 926
 927 int
 928 uclient_http_set_header(struct uclient *cl, const char *name, const char *value)
 929 {
 930         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 931
 932         if (cl->backend != &uclient_backend_http)
 933                 return -1;
 934
 935         if (uh->state > HTTP_STATE_INIT)
 936                 return -1;
 937
 938         blobmsg_add_string(&uh->headers, name, value);
 939         return 0;
 940 }
 941
 942 static int
 943 uclient_http_send_data(struct uclient *cl, const char *buf, unsigned int len)
 944 {
 945         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 946
 947         if (uh->state >= HTTP_STATE_REQUEST_DONE)
 948                 return -1;
 949
 950         uclient_http_send_headers(uh);
 951
 952         if (len > 0) {
 953                 ustream_printf(uh->us, "%X\r\n", len);
 954                 ustream_write(uh->us, buf, len, false);
 955                 ustream_printf(uh->us, "\r\n");
 956         }
 957
 958         return len;
 959 }
 960
 961 static int
 962 uclient_http_request_done(struct uclient *cl)
 963 {
 964         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 965
 966         if (uh->state >= HTTP_STATE_REQUEST_DONE)
 967                 return -1;
 968
 969         uclient_http_send_headers(uh);
 970         if (uh->req_type == REQ_POST || uh->req_type == REQ_PUT)
 971                 ustream_printf(uh->us, "0\r\n\r\n");
 972         uh->state = HTTP_STATE_REQUEST_DONE;
 973
 974         return 0;
 975 }
 976
 977 static int
 978 uclient_http_read(struct uclient *cl, char *buf, unsigned int len)
 979 {
 980         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 981         int read_len = 0;
 982         char *data, *data_end;
 983
 984         if (uh->state < HTTP_STATE_RECV_DATA || !uh->us)
 985                 return 0;
 986
 987         data = ustream_get_read_buf(uh->us, &read_len);
 988         if (!data || !read_len)
 989                 return 0;
 990
 991         data_end = data + read_len;
 992         read_len = 0;
 993
 994         if (uh->read_chunked == 0) {
 995                 char *sep;
 996
 997                 if (data[0] == '\r' && data[1] == '\n') {
 998                         data += 2;
 999                         read_len += 2;
1000                 }
1001
1002                 sep = strstr(data, "\r\n");
1003                 if (!sep)
1004                         return 0;
1005
1006                 *sep = 0;
1007                 uh->read_chunked = strtoul(data, NULL, 16);
1008
1009                 read_len += sep + 2 - data;
1010                 data = sep + 2;
1011
1012                 if (!uh->read_chunked) {
1013                         uh->eof = true;
1014                         uh->uc.data_eof = true;
1015                 }
1016         }
1017
1018         if (len > data_end - data)
1019                 len = data_end - data;
1020
1021         if (uh->read_chunked >= 0) {
1022                 if (len > uh->read_chunked)
1023                         len = uh->read_chunked;
1024
1025                 uh->read_chunked -= len;
1026         } else if (uh->content_length >= 0) {
1027                 if (len > uh->content_length)
1028                         len = uh->content_length;
1029
1030                 uh->content_length -= len;
1031                 if (!uh->content_length) {
1032                         uh->eof = true;
1033                         uh->uc.data_eof = true;
1034                 }
1035         }
1036
1037         if (len > 0) {
1038                 read_len += len;
1039                 memcpy(buf, data, len);
1040         }
1041
1042         if (read_len > 0)
1043                 ustream_consume(uh->us, read_len);
1044
1045         uclient_notify_eof(uh);
1046
1047         /* Now that we consumed something and if this isn't EOF, start timer again */
1048         if (!uh->uc.eof && !cl->connection_timeout.pending)
1049                 uloop_timeout_set(&cl->connection_timeout, cl->timeout_msecs);
1050
1051         return len;
1052 }
1053
1054 bool uclient_http_redirect(struct uclient *cl)
1055 {
1056         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
1057         struct blobmsg_policy location = {
1058                 .name = "location",
1059                 .type = BLOBMSG_TYPE_STRING,
1060         };
1061         struct uclient_url *url = cl->url;
1062         struct blob_attr *tb;
1063
1064         if (cl->backend != &uclient_backend_http)
1065                 return false;
1066
1067         switch (cl->status_code) {
1068         case 301:
1069         case 302:
1070         case 307:
1071                 break;
1072         default:
1073                 return false;
1074         }
1075
1076         blobmsg_parse(&location, 1, &tb, blob_data(uh->meta.head), blob_len(uh->meta.head));
1077         if (!tb)
1078                 return false;
1079
1080         url = uclient_get_url(blobmsg_data(tb), url->auth);
1081         if (!url)
1082                 return false;
1083
1084         free(cl->url);
1085         cl->url = url;
1086         uclient_http_connect(cl);
1087         uclient_http_request_done(cl);
1088
1089         return true;
1090 }
1091
1092 int uclient_http_set_ssl_ctx(struct uclient *cl, const struct ustream_ssl_ops *ops,
1093                              struct ustream_ssl_ctx *ctx, bool require_validation)
1094 {
1095         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
1096
1097         if (cl->backend != &uclient_backend_http)
1098                 return -1;
1099
1100         uclient_http_free_url_state(cl);
1101
1102         uclient_http_free_ssl_ctx(uh);
1103         uh->ssl_ops = ops;
1104         uh->ssl_ctx = ctx;
1105         uh->ssl_require_validation = !!ctx && require_validation;
1106
1107         return 0;
1108 }
1109
1110 const struct uclient_backend uclient_backend_http = {
1111         .prefix = uclient_http_prefix,
1112
1113         .alloc = uclient_http_alloc,
1114         .free = uclient_http_free,
1115         .connect = uclient_http_connect,
1116         .disconnect = uclient_http_request_disconnect,
1117         .update_url = uclient_http_free_url_state,
1118
1119         .read = uclient_http_read,
1120         .write = uclient_http_send_data,
1121         .request = uclient_http_request_done,
1122 };