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