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