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