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 <sys/socket.h>
  19 #include <stdio.h>
  20 #include <ctype.h>
  21 #include <unistd.h>
  22 #include <stdint.h>
  23 #include <string.h>
  24 #include <fcntl.h>
  25
  26 #include <libubox/ustream.h>
  27 #include <libubox/ustream-ssl.h>
  28 #include <libubox/usock.h>
  29 #include <libubox/blobmsg.h>
  30
  31 #include "uclient.h"
  32 #include "uclient-utils.h"
  33 #include "uclient-backend.h"
  34
  35 enum auth_type {
  36         AUTH_TYPE_UNKNOWN,
  37         AUTH_TYPE_NONE,
  38         AUTH_TYPE_BASIC,
  39         AUTH_TYPE_DIGEST,
  40 };
  41
  42 enum request_type {
  43         REQ_GET,
  44         REQ_HEAD,
  45         REQ_POST,
  46         REQ_PUT,
  47         REQ_DELETE,
  48         __REQ_MAX
  49 };
  50
  51 enum http_state {
  52         HTTP_STATE_INIT,
  53         HTTP_STATE_HEADERS_SENT,
  54         HTTP_STATE_REQUEST_DONE,
  55         HTTP_STATE_RECV_HEADERS,
  56         HTTP_STATE_RECV_DATA,
  57         HTTP_STATE_ERROR,
  58 };
  59
  60 static const char * const request_types[__REQ_MAX] = {
  61         [REQ_GET] = "GET",
  62         [REQ_HEAD] = "HEAD",
  63         [REQ_POST] = "POST",
  64         [REQ_PUT] = "PUT",
  65         [REQ_DELETE] = "DELETE",
  66 };
  67
  68 struct uclient_http {
  69         struct uclient uc;
  70
  71         const struct ustream_ssl_ops *ssl_ops;
  72         struct ustream_ssl_ctx *ssl_ctx;
  73         struct ustream *us;
  74
  75         struct ustream_fd ufd;
  76         struct ustream_ssl ussl;
  77
  78         struct uloop_timeout disconnect_t;
  79         unsigned int seq;
  80
  81         bool ssl_require_validation;
  82         bool ssl;
  83         bool eof;
  84         bool connection_close;
  85         bool disconnect;
  86         enum request_type req_type;
  87         enum http_state state;
  88
  89         enum auth_type auth_type;
  90         char *auth_str;
  91
  92         long read_chunked;
  93         long content_length;
  94
  95         int usock_flags;
  96
  97         uint32_t nc;
  98
  99         struct blob_buf headers;
 100         struct blob_buf meta;
 101 };
 102
 103 enum {
 104         PREFIX_HTTP,
 105         PREFIX_HTTPS,
 106         __PREFIX_MAX,
 107 };
 108
 109 static const char * const uclient_http_prefix[] = {
 110         [PREFIX_HTTP] = "http://",
 111         [PREFIX_HTTPS] = "https://",
 112         [__PREFIX_MAX] = NULL
 113 };
 114
 115 static int uclient_http_connect(struct uclient *cl);
 116
 117 static int uclient_do_connect(struct uclient_http *uh, const char *port)
 118 {
 119         socklen_t sl;
 120         int fd;
 121
 122         if (uh->uc.url->port)
 123                 port = uh->uc.url->port;
 124
 125         memset(&uh->uc.remote_addr, 0, sizeof(uh->uc.remote_addr));
 126
 127         fd = usock_inet_timeout(USOCK_TCP | USOCK_NONBLOCK | uh->usock_flags,
 128                                 uh->uc.url->host, port, &uh->uc.remote_addr,
 129                                 uh->uc.timeout_msecs);
 130         if (fd < 0)
 131                 return -1;
 132
 133         fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
 134         ustream_fd_init(&uh->ufd, fd);
 135
 136         sl = sizeof(uh->uc.local_addr);
 137         memset(&uh->uc.local_addr, 0, sl);
 138         getsockname(fd, &uh->uc.local_addr.sa, &sl);
 139
 140         return 0;
 141 }
 142
 143 static void uclient_http_disconnect(struct uclient_http *uh)
 144 {
 145         uloop_timeout_cancel(&uh->disconnect_t);
 146         if (!uh->us)
 147                 return;
 148
 149         if (uh->ssl)
 150                 ustream_free(&uh->ussl.stream);
 151         ustream_free(&uh->ufd.stream);
 152         if(uh->ufd.fd.fd)
 153                 close(uh->ufd.fd.fd);
 154         uh->us = NULL;
 155 }
 156
 157 static void uclient_http_free_url_state(struct uclient *cl)
 158 {
 159         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 160
 161         uh->auth_type = AUTH_TYPE_UNKNOWN;
 162         free(uh->auth_str);
 163         uh->auth_str = NULL;
 164         uclient_http_disconnect(uh);
 165 }
 166
 167 static void uclient_http_error(struct uclient_http *uh, int code)
 168 {
 169         uh->state = HTTP_STATE_ERROR;
 170         uh->us->eof = true;
 171         ustream_state_change(uh->us);
 172         uclient_backend_set_error(&uh->uc, code);
 173 }
 174
 175 static void uclient_http_request_disconnect(struct uclient *cl)
 176 {
 177         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 178
 179         if (!uh->us)
 180                 return;
 181
 182         uh->eof = true;
 183         uh->disconnect = true;
 184         uloop_timeout_set(&uh->disconnect_t, 1);
 185 }
 186
 187 static void uclient_notify_eof(struct uclient_http *uh)
 188 {
 189         struct ustream *us = uh->us;
 190
 191         if (uh->disconnect)
 192                 return;
 193
 194         if (!uh->eof) {
 195                 if (!us->eof && !us->write_error)
 196                         return;
 197
 198                 if (ustream_pending_data(us, false))
 199                         return;
 200         }
 201
 202         if (uh->content_length < 0 && uh->read_chunked >= 0)
 203                 uh->uc.data_eof = true;
 204
 205         uclient_backend_set_eof(&uh->uc);
 206
 207         if (uh->connection_close)
 208                 uclient_http_request_disconnect(&uh->uc);
 209 }
 210
 211 static void uclient_http_reset_state(struct uclient_http *uh)
 212 {
 213         uh->seq++;
 214         uclient_backend_reset_state(&uh->uc);
 215         uh->read_chunked = -1;
 216         uh->content_length = -1;
 217         uh->eof = false;
 218         uh->disconnect = false;
 219         uh->connection_close = false;
 220         uh->state = HTTP_STATE_INIT;
 221
 222         if (uh->auth_type == AUTH_TYPE_UNKNOWN && !uh->uc.url->auth)
 223                 uh->auth_type = AUTH_TYPE_NONE;
 224 }
 225
 226 static void uclient_http_init_request(struct uclient_http *uh)
 227 {
 228         uh->seq++;
 229         uclient_http_reset_state(uh);
 230         blob_buf_init(&uh->meta, 0);
 231 }
 232
 233 static enum auth_type
 234 uclient_http_update_auth_type(struct uclient_http *uh)
 235 {
 236         if (!uh->auth_str)
 237                 return AUTH_TYPE_NONE;
 238
 239         if (!strncasecmp(uh->auth_str, "basic", 5))
 240                 return AUTH_TYPE_BASIC;
 241
 242         if (!strncasecmp(uh->auth_str, "digest", 6))
 243                 return AUTH_TYPE_DIGEST;
 244
 245         return AUTH_TYPE_NONE;
 246 }
 247
 248 static void uclient_http_process_headers(struct uclient_http *uh)
 249 {
 250         enum {
 251                 HTTP_HDR_TRANSFER_ENCODING,
 252                 HTTP_HDR_CONNECTION,
 253                 HTTP_HDR_CONTENT_LENGTH,
 254                 HTTP_HDR_AUTH,
 255                 __HTTP_HDR_MAX,
 256         };
 257         static const struct blobmsg_policy hdr_policy[__HTTP_HDR_MAX] = {
 258 #define hdr(_name) { .name = _name, .type = BLOBMSG_TYPE_STRING }
 259                 [HTTP_HDR_TRANSFER_ENCODING] = hdr("transfer-encoding"),
 260                 [HTTP_HDR_CONNECTION] = hdr("connection"),
 261                 [HTTP_HDR_CONTENT_LENGTH] = hdr("content-length"),
 262                 [HTTP_HDR_AUTH] = hdr("www-authenticate"),
 263 #undef hdr
 264         };
 265         struct blob_attr *tb[__HTTP_HDR_MAX];
 266         struct blob_attr *cur;
 267
 268         blobmsg_parse(hdr_policy, __HTTP_HDR_MAX, tb, blob_data(uh->meta.head), blob_len(uh->meta.head));
 269
 270         cur = tb[HTTP_HDR_TRANSFER_ENCODING];
 271         if (cur && strstr(blobmsg_data(cur), "chunked"))
 272                 uh->read_chunked = 0;
 273
 274         cur = tb[HTTP_HDR_CONNECTION];
 275         if (cur && strstr(blobmsg_data(cur), "close"))
 276                 uh->connection_close = true;
 277
 278         cur = tb[HTTP_HDR_CONTENT_LENGTH];
 279         if (cur)
 280                 uh->content_length = strtoul(blobmsg_data(cur), NULL, 10);
 281
 282         cur = tb[HTTP_HDR_AUTH];
 283         if (cur) {
 284                 free(uh->auth_str);
 285                 uh->auth_str = strdup(blobmsg_data(cur));
 286         }
 287
 288         uh->auth_type = uclient_http_update_auth_type(uh);
 289 }
 290
 291 static bool uclient_request_supports_body(enum request_type req_type)
 292 {
 293         switch (req_type) {
 294         case REQ_POST:
 295         case REQ_PUT:
 296         case REQ_DELETE:
 297                 return true;
 298         default:
 299                 return false;
 300         }
 301 }
 302
 303 static int
 304 uclient_http_add_auth_basic(struct uclient_http *uh)
 305 {
 306         struct uclient_url *url = uh->uc.url;
 307         int auth_len = strlen(url->auth);
 308         char *auth_buf;
 309
 310         if (auth_len > 512)
 311                 return -EINVAL;
 312
 313         auth_buf = alloca(base64_len(auth_len) + 1);
 314         if (!auth_buf)
 315                 return -ENOMEM;
 316
 317         base64_encode(url->auth, auth_len, auth_buf);
 318         ustream_printf(uh->us, "Authorization: Basic %s\r\n", auth_buf);
 319
 320         return 0;
 321 }
 322
 323 static char *digest_unquote_sep(char **str)
 324 {
 325         char *cur = *str + 1;
 326         char *start = cur;
 327         char *out;
 328
 329         if (**str != '"')
 330                 return NULL;
 331
 332         out = cur;
 333         while (1) {
 334                 if (!*cur)
 335                         return NULL;
 336
 337                 if (*cur == '"') {
 338                         cur++;
 339                         break;
 340                 }
 341
 342                 if (*cur == '\\')
 343                         cur++;
 344
 345                 *(out++) = *(cur++);
 346         }
 347
 348         if (*cur == ',')
 349                 cur++;
 350
 351         *out = 0;
 352         *str = cur;
 353
 354         return start;
 355 }
 356
 357 static char *digest_sep(char **str)
 358 {
 359         char *cur, *next;
 360
 361         cur = *str;
 362         next = strchr(*str, ',');
 363         if (next) {
 364             *str = next + 1;
 365             *next = 0;
 366         } else {
 367             *str += strlen(*str);
 368         }
 369
 370         return cur;
 371 }
 372
 373 static bool strmatch(char **str, const char *prefix)
 374 {
 375         int len = strlen(prefix);
 376
 377         if (strncmp(*str, prefix, len) != 0 || (*str)[len] != '=')
 378                 return false;
 379
 380         *str += len + 1;
 381         return true;
 382 }
 383
 384 static void
 385 get_cnonce(char *dest)
 386 {
 387         uint32_t val = 0;
 388         FILE *f;
 389         size_t n;
 390
 391         f = fopen("/dev/urandom", "r");
 392         if (f) {
 393                 n = fread(&val, sizeof(val), 1, f);
 394                 fclose(f);
 395                 if (n != 1)
 396                         return;
 397         }
 398
 399         bin_to_hex(dest, &val, sizeof(val));
 400 }
 401
 402 static void add_field(char **buf, int *ofs, int *len, const char *name, const char *val)
 403 {
 404         int available = *len - *ofs;
 405         int required;
 406         const char *next;
 407         char *cur;
 408
 409         if (*len && !*buf)
 410                 return;
 411
 412         required = strlen(name) + 4 + strlen(val) * 2;
 413         if (required > available)
 414                 *len += required - available + 64;
 415
 416         *buf = realloc(*buf, *len);
 417         if (!*buf)
 418                 return;
 419
 420         cur = *buf + *ofs;
 421         cur += sprintf(cur, ", %s=\"", name);
 422
 423         while ((next = strchr(val, '"'))) {
 424                 if (next > val) {
 425                         memcpy(cur, val, next - val);
 426                         cur += next - val;
 427                 }
 428
 429                 cur += sprintf(cur, "\\\"");
 430                 val = next + 1;
 431         }
 432
 433         cur += sprintf(cur, "%s\"", val);
 434         *ofs = cur - *buf;
 435 }
 436
 437 static int
 438 uclient_http_add_auth_digest(struct uclient_http *uh)
 439 {
 440         struct uclient_url *url = uh->uc.url;
 441         const char *realm = NULL, *opaque = NULL;
 442         const char *user, *password;
 443         char *buf, *next, *buf_orig;
 444         int len, ofs;
 445         int err = 0;
 446
 447         char cnonce_str[9];
 448         char nc_str[9];
 449         char ahash[33];
 450         char hash[33];
 451
 452         struct http_digest_data data = {
 453                 .nc = nc_str,
 454                 .cnonce = cnonce_str,
 455                 .auth_hash = ahash,
 456         };
 457
 458         len = strlen(uh->auth_str) + 1;
 459         if (len > 512) {
 460                 err = -EINVAL;
 461                 goto fail;
 462         }
 463
 464         buf = alloca(len);
 465         if (!buf) {
 466                 err = -ENOMEM;
 467                 goto fail;
 468         }
 469
 470         strcpy(buf, uh->auth_str);
 471
 472         /* skip auth type */
 473         buf_orig = strsep(&buf, " ");
 474
 475         next = buf;
 476         while (*next) {
 477                 const char **dest = NULL;
 478                 const char *tmp;
 479
 480                 while (*next && isspace(*next))
 481                         next++;
 482
 483                 if (strmatch(&next, "realm"))
 484                         dest = &realm;
 485                 else if (strmatch(&next, "qop"))
 486                         dest = &data.qop;
 487                 else if (strmatch(&next, "nonce"))
 488                         dest = &data.nonce;
 489                 else if (strmatch(&next, "opaque"))
 490                         dest = &opaque;
 491                 else if (strmatch(&next, "stale") ||
 492                          strmatch(&next, "algorithm") ||
 493                          strmatch(&next, "auth-param")) {
 494                         digest_sep(&next);
 495                         continue;
 496                 } else if (strmatch(&next, "domain") ||
 497                          strmatch(&next, "qop-options"))
 498                         dest = &tmp;
 499                 else {
 500                         digest_sep(&next);
 501                         continue;
 502                 }
 503
 504                 *dest = digest_unquote_sep(&next);
 505         }
 506
 507         if (!realm || !data.qop || !data.nonce) {
 508                 err = -EINVAL;
 509                 goto fail_buf;
 510         }
 511
 512         sprintf(nc_str, "%08x", uh->nc++);
 513         get_cnonce(cnonce_str);
 514
 515         data.qop = "auth";
 516         data.uri = url->location;
 517         data.method = request_types[uh->req_type];
 518
 519         password = strchr(url->auth, ':');
 520         if (password) {
 521                 char *user_buf;
 522
 523                 len = password - url->auth;
 524                 if (len > 256) {
 525                         err = -EINVAL;
 526                         goto fail_buf;
 527                 }
 528
 529                 user_buf = alloca(len + 1);
 530                 if (!user_buf) {
 531                         err = -ENOMEM;
 532                         goto fail_buf;
 533                 }
 534
 535                 strncpy(user_buf, url->auth, len);
 536                 user_buf[len] = 0;
 537                 user = user_buf;
 538                 password++;
 539         } else {
 540                 user = url->auth;
 541                 password = "";
 542         }
 543
 544         http_digest_calculate_auth_hash(ahash, user, realm, password);
 545         http_digest_calculate_response(hash, &data);
 546
 547         buf = NULL;
 548         len = 0;
 549         ofs = 0;
 550
 551         add_field(&buf, &ofs, &len, "username", user);
 552         add_field(&buf, &ofs, &len, "realm", realm);
 553         add_field(&buf, &ofs, &len, "nonce", data.nonce);
 554         add_field(&buf, &ofs, &len, "uri", data.uri);
 555         add_field(&buf, &ofs, &len, "cnonce", data.cnonce);
 556         add_field(&buf, &ofs, &len, "response", hash);
 557         if (opaque)
 558                 add_field(&buf, &ofs, &len, "opaque", opaque);
 559
 560         ustream_printf(uh->us, "Authorization: Digest nc=%s, qop=%s%s\r\n", data.nc, data.qop, buf);
 561
 562         free(buf);
 563
 564         return 0;
 565
 566 fail_buf:
 567         free(buf_orig);
 568 fail:
 569         return err;
 570 }
 571
 572 static int
 573 uclient_http_add_auth_header(struct uclient_http *uh)
 574 {
 575         if (!uh->uc.url->auth)
 576                 return 0;
 577
 578         switch (uh->auth_type) {
 579         case AUTH_TYPE_UNKNOWN:
 580         case AUTH_TYPE_NONE:
 581                 break;
 582         case AUTH_TYPE_BASIC:
 583                 return uclient_http_add_auth_basic(uh);
 584         case AUTH_TYPE_DIGEST:
 585                 return uclient_http_add_auth_digest(uh);
 586         }
 587
 588         return 0;
 589 }
 590
 591 static int
 592 uclient_http_send_headers(struct uclient_http *uh)
 593 {
 594         struct uclient_url *url = uh->uc.url;
 595         struct blob_attr *cur;
 596         enum request_type req_type = uh->req_type;
 597         bool literal_ipv6;
 598         int err, rem;
 599
 600         if (uh->state >= HTTP_STATE_HEADERS_SENT)
 601                 return 0;
 602
 603         if (uh->uc.proxy_url)
 604                 url = uh->uc.proxy_url;
 605
 606         literal_ipv6 = strchr(url->host, ':');
 607
 608         ustream_printf(uh->us,
 609                 "%s %s HTTP/1.1\r\n"
 610                 "Host: %s%s%s%s%s\r\n",
 611                 request_types[req_type], url->location,
 612                 literal_ipv6 ? "[" : "",
 613                 url->host,
 614                 literal_ipv6 ? "]" : "",
 615                 url->port ? ":" : "",
 616                 url->port ? url->port : "");
 617
 618         blobmsg_for_each_attr(cur, uh->headers.head, rem)
 619                 ustream_printf(uh->us, "%s: %s\r\n", blobmsg_name(cur), (char *) blobmsg_data(cur));
 620
 621         if (uclient_request_supports_body(uh->req_type))
 622                 ustream_printf(uh->us, "Transfer-Encoding: chunked\r\n");
 623
 624         err = uclient_http_add_auth_header(uh);
 625         if (err)
 626                 return err;
 627
 628         ustream_printf(uh->us, "\r\n");
 629
 630         uh->state = HTTP_STATE_HEADERS_SENT;
 631
 632         return 0;
 633 }
 634
 635 static void uclient_http_headers_complete(struct uclient_http *uh)
 636 {
 637         enum auth_type auth_type = uh->auth_type;
 638         int seq = uh->uc.seq;
 639
 640         uh->state = HTTP_STATE_RECV_DATA;
 641         uh->uc.meta = uh->meta.head;
 642         uclient_http_process_headers(uh);
 643
 644         if (auth_type == AUTH_TYPE_UNKNOWN && uh->uc.status_code == 401 &&
 645             (uh->req_type == REQ_HEAD || uh->req_type == REQ_GET)) {
 646                 uclient_http_connect(&uh->uc);
 647                 uclient_http_send_headers(uh);
 648                 uh->state = HTTP_STATE_REQUEST_DONE;
 649                 return;
 650         }
 651
 652         if (uh->uc.cb->header_done)
 653                 uh->uc.cb->header_done(&uh->uc);
 654
 655         if (uh->eof || seq != uh->uc.seq)
 656                 return;
 657
 658         if (uh->req_type == REQ_HEAD || uh->uc.status_code == 204) {
 659                 uh->eof = true;
 660                 uclient_notify_eof(uh);
 661         }
 662 }
 663
 664 static void uclient_parse_http_line(struct uclient_http *uh, char *data)
 665 {
 666         char *name;
 667         char *sep;
 668
 669         if (uh->state == HTTP_STATE_REQUEST_DONE) {
 670                 char *code;
 671
 672                 if (!strlen(data))
 673                         return;
 674
 675                 /* HTTP/1.1 */
 676                 strsep(&data, " ");
 677
 678                 code = strsep(&data, " ");
 679                 if (!code)
 680                         goto error;
 681
 682                 uh->uc.status_code = strtoul(code, &sep, 10);
 683                 if (sep && *sep)
 684                         goto error;
 685
 686                 uh->state = HTTP_STATE_RECV_HEADERS;
 687                 return;
 688         }
 689
 690         if (!*data) {
 691                 uclient_http_headers_complete(uh);
 692                 return;
 693         }
 694
 695         sep = strchr(data, ':');
 696         if (!sep)
 697                 return;
 698
 699         *(sep++) = 0;
 700
 701         for (name = data; *name; name++)
 702                 *name = tolower(*name);
 703
 704         name = data;
 705         while (isspace(*sep))
 706                 sep++;
 707
 708         blobmsg_add_string(&uh->meta, name, sep);
 709         return;
 710
 711 error:
 712         uh->uc.status_code = 400;
 713         uh->eof = true;
 714         uclient_notify_eof(uh);
 715 }
 716
 717 static void __uclient_notify_read(struct uclient_http *uh)
 718 {
 719         struct uclient *uc = &uh->uc;
 720         unsigned int seq = uh->seq;
 721         char *data;
 722         int len;
 723
 724         if (uh->state < HTTP_STATE_REQUEST_DONE || uh->state == HTTP_STATE_ERROR)
 725                 return;
 726
 727         data = ustream_get_read_buf(uh->us, &len);
 728         if (!data || !len)
 729                 return;
 730
 731         if (uh->state < HTTP_STATE_RECV_DATA) {
 732                 char *sep, *next;
 733                 int cur_len;
 734
 735                 do {
 736                         sep = strchr(data, '\n');
 737                         if (!sep)
 738                                 break;
 739
 740                         next = sep + 1;
 741                         if (sep > data && sep[-1] == '\r')
 742                                 sep--;
 743
 744                         /* Check for multi-line HTTP headers */
 745                         if (sep > data) {
 746                                 if (!*next)
 747                                         return;
 748
 749                                 if (isspace(*next) && *next != '\r' && *next != '\n') {
 750                                         sep[0] = ' ';
 751                                         if (sep + 1 < next)
 752                                                 sep[1] = ' ';
 753                                         continue;
 754                                 }
 755                         }
 756
 757                         *sep = 0;
 758                         cur_len = next - data;
 759                         uclient_parse_http_line(uh, data);
 760                         if (seq != uh->seq)
 761                                 return;
 762
 763                         ustream_consume(uh->us, cur_len);
 764                         len -= cur_len;
 765
 766                         if (uh->eof)
 767                                 return;
 768
 769                         data = ustream_get_read_buf(uh->us, &len);
 770                 } while (data && uh->state < HTTP_STATE_RECV_DATA);
 771
 772                 if (!len)
 773                         return;
 774         }
 775
 776         if (uh->eof)
 777                 return;
 778
 779         if (uh->state == HTTP_STATE_RECV_DATA) {
 780                 /* Now it's uclient user turn to read some data */
 781                 uloop_timeout_cancel(&uc->connection_timeout);
 782
 783                 if (uc->cb->data_read)
 784                         uc->cb->data_read(uc);
 785         }
 786 }
 787
 788 static void __uclient_notify_write(struct uclient_http *uh)
 789 {
 790         struct uclient *uc = &uh->uc;
 791
 792         if (uc->cb->data_sent)
 793                 uc->cb->data_sent(uc);
 794 }
 795
 796 static void uclient_notify_read(struct ustream *us, int bytes)
 797 {
 798         struct uclient_http *uh = container_of(us, struct uclient_http, ufd.stream);
 799
 800         __uclient_notify_read(uh);
 801 }
 802
 803 static void uclient_notify_write(struct ustream *us, int bytes)
 804 {
 805         struct uclient_http *uh = container_of(us, struct uclient_http, ufd.stream);
 806
 807         __uclient_notify_write(uh);
 808 }
 809
 810 static void uclient_notify_state(struct ustream *us)
 811 {
 812         struct uclient_http *uh = container_of(us, struct uclient_http, ufd.stream);
 813
 814         if (uh->ufd.stream.write_error) {
 815                 uclient_http_error(uh, UCLIENT_ERROR_CONNECT);
 816                 return;
 817         }
 818         uclient_notify_eof(uh);
 819 }
 820
 821 static int uclient_setup_http(struct uclient_http *uh)
 822 {
 823         struct ustream *us = &uh->ufd.stream;
 824         int ret;
 825
 826         uh->us = us;
 827         uh->ssl = false;
 828
 829         us->string_data = true;
 830         us->notify_state = uclient_notify_state;
 831         us->notify_read = uclient_notify_read;
 832         us->notify_write = uclient_notify_write;
 833
 834         ret = uclient_do_connect(uh, "80");
 835         if (ret)
 836                 return UCLIENT_ERROR_CONNECT;
 837
 838         return 0;
 839 }
 840
 841 static void uclient_ssl_notify_read(struct ustream *us, int bytes)
 842 {
 843         struct uclient_http *uh = container_of(us, struct uclient_http, ussl.stream);
 844
 845         __uclient_notify_read(uh);
 846 }
 847
 848 static void uclient_ssl_notify_write(struct ustream *us, int bytes)
 849 {
 850         struct uclient_http *uh = container_of(us, struct uclient_http, ussl.stream);
 851
 852         __uclient_notify_write(uh);
 853 }
 854
 855 static void uclient_ssl_notify_state(struct ustream *us)
 856 {
 857         struct uclient_http *uh = container_of(us, struct uclient_http, ussl.stream);
 858
 859         uclient_notify_eof(uh);
 860 }
 861
 862 static void uclient_ssl_notify_error(struct ustream_ssl *ssl, int error, const char *str)
 863 {
 864         struct uclient_http *uh = container_of(ssl, struct uclient_http, ussl);
 865
 866         uclient_http_error(uh, UCLIENT_ERROR_CONNECT);
 867 }
 868
 869 static void uclient_ssl_notify_verify_error(struct ustream_ssl *ssl, int error, const char *str)
 870 {
 871         struct uclient_http *uh = container_of(ssl, struct uclient_http, ussl);
 872
 873         if (!uh->ssl_require_validation)
 874                 return;
 875
 876         uclient_http_error(uh, UCLIENT_ERROR_SSL_INVALID_CERT);
 877 }
 878
 879 static void uclient_ssl_notify_connected(struct ustream_ssl *ssl)
 880 {
 881         struct uclient_http *uh = container_of(ssl, struct uclient_http, ussl);
 882
 883         if (!uh->ssl_require_validation)
 884                 return;
 885
 886         if (!uh->ussl.valid_cn)
 887                 uclient_http_error(uh, UCLIENT_ERROR_SSL_CN_MISMATCH);
 888 }
 889
 890 static int uclient_setup_https(struct uclient_http *uh)
 891 {
 892         struct ustream *us = &uh->ussl.stream;
 893         int ret;
 894
 895         uh->ssl = true;
 896         uh->us = us;
 897
 898         if (!uh->ssl_ctx)
 899                 return UCLIENT_ERROR_MISSING_SSL_CONTEXT;
 900
 901         ret = uclient_do_connect(uh, "443");
 902         if (ret)
 903                 return UCLIENT_ERROR_CONNECT;
 904
 905         us->string_data = true;
 906         us->notify_state = uclient_ssl_notify_state;
 907         us->notify_read = uclient_ssl_notify_read;
 908         us->notify_write = uclient_ssl_notify_write;
 909         uh->ussl.notify_error = uclient_ssl_notify_error;
 910         uh->ussl.notify_verify_error = uclient_ssl_notify_verify_error;
 911         uh->ussl.notify_connected = uclient_ssl_notify_connected;
 912         uh->ussl.server_name = uh->uc.url->host;
 913         uh->ssl_ops->init(&uh->ussl, &uh->ufd.stream, uh->ssl_ctx, false);
 914         uh->ssl_ops->set_peer_cn(&uh->ussl, uh->uc.url->host);
 915
 916         return 0;
 917 }
 918
 919 static int uclient_http_connect(struct uclient *cl)
 920 {
 921         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 922         int ret;
 923
 924         if (!cl->eof || uh->disconnect || uh->connection_close)
 925                 uclient_http_disconnect(uh);
 926
 927         uclient_http_init_request(uh);
 928
 929         if (uh->us)
 930                 return 0;
 931
 932         uh->ssl = cl->url->prefix == PREFIX_HTTPS;
 933
 934         if (uh->ssl)
 935                 ret = uclient_setup_https(uh);
 936         else
 937                 ret = uclient_setup_http(uh);
 938
 939         return ret;
 940 }
 941
 942 static void uclient_http_disconnect_cb(struct uloop_timeout *timeout)
 943 {
 944         struct uclient_http *uh = container_of(timeout, struct uclient_http, disconnect_t);
 945
 946         uclient_http_disconnect(uh);
 947 }
 948
 949 static struct uclient *uclient_http_alloc(void)
 950 {
 951         struct uclient_http *uh;
 952
 953         uh = calloc_a(sizeof(*uh));
 954         if (!uh)
 955                 return NULL;
 956
 957         uh->disconnect_t.cb = uclient_http_disconnect_cb;
 958         blob_buf_init(&uh->headers, 0);
 959
 960         return &uh->uc;
 961 }
 962
 963 static void uclient_http_free_ssl_ctx(struct uclient_http *uh)
 964 {
 965         uh->ssl_ops = NULL;
 966         uh->ssl_ctx = NULL;
 967 }
 968
 969 static void uclient_http_free(struct uclient *cl)
 970 {
 971         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 972
 973         uclient_http_free_url_state(cl);
 974         uclient_http_free_ssl_ctx(uh);
 975         blob_buf_free(&uh->headers);
 976         blob_buf_free(&uh->meta);
 977         free(uh);
 978 }
 979
 980 int
 981 uclient_http_set_request_type(struct uclient *cl, const char *type)
 982 {
 983         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 984         int i;
 985
 986         if (cl->backend != &uclient_backend_http)
 987                 return -1;
 988
 989         if (uh->state > HTTP_STATE_INIT)
 990                 return -1;
 991
 992         for (i = 0; i < ARRAY_SIZE(request_types); i++) {
 993                 if (strcmp(request_types[i], type) != 0)
 994                         continue;
 995
 996                 uh->req_type = i;
 997                 return 0;
 998         }
 999
1000         return -1;
1001 }
1002
1003 int
1004 uclient_http_reset_headers(struct uclient *cl)
1005 {
1006         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
1007
1008         blob_buf_init(&uh->headers, 0);
1009
1010         return 0;
1011 }
1012
1013 int
1014 uclient_http_set_header(struct uclient *cl, const char *name, const char *value)
1015 {
1016         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
1017
1018         if (cl->backend != &uclient_backend_http)
1019                 return -1;
1020
1021         if (uh->state > HTTP_STATE_INIT)
1022                 return -1;
1023
1024         blobmsg_add_string(&uh->headers, name, value);
1025         return 0;
1026 }
1027
1028 static int
1029 uclient_http_send_data(struct uclient *cl, const char *buf, unsigned int len)
1030 {
1031         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
1032         int err;
1033
1034         if (uh->state >= HTTP_STATE_REQUEST_DONE)
1035                 return -1;
1036
1037         err = uclient_http_send_headers(uh);
1038         if (err)
1039                 return err;
1040
1041         if (len > 0) {
1042                 ustream_printf(uh->us, "%X\r\n", len);
1043                 ustream_write(uh->us, buf, len, false);
1044                 ustream_printf(uh->us, "\r\n");
1045         }
1046
1047         return len;
1048 }
1049
1050 static int
1051 uclient_http_request_done(struct uclient *cl)
1052 {
1053         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
1054         int err;
1055
1056         if (uh->state >= HTTP_STATE_REQUEST_DONE)
1057                 return -1;
1058
1059         err = uclient_http_send_headers(uh);
1060         if (err)
1061                 return err;
1062
1063         if (uclient_request_supports_body(uh->req_type))
1064                 ustream_printf(uh->us, "0\r\n\r\n");
1065         uh->state = HTTP_STATE_REQUEST_DONE;
1066
1067         return 0;
1068 }
1069
1070 static int
1071 uclient_http_read(struct uclient *cl, char *buf, unsigned int len)
1072 {
1073         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
1074         int read_len = 0;
1075         char *data, *data_end;
1076
1077         if (uh->state < HTTP_STATE_RECV_DATA || !uh->us)
1078                 return 0;
1079
1080         data = ustream_get_read_buf(uh->us, &read_len);
1081         if (!data || !read_len)
1082                 return 0;
1083
1084         data_end = data + read_len;
1085         read_len = 0;
1086
1087         if (uh->read_chunked == 0) {
1088                 char *sep;
1089
1090                 if (data[0] == '\r' && data[1] == '\n') {
1091                         data += 2;
1092                         read_len += 2;
1093                 }
1094
1095                 sep = strstr(data, "\r\n");
1096                 if (!sep)
1097                         return 0;
1098
1099                 *sep = 0;
1100                 uh->read_chunked = strtoul(data, NULL, 16);
1101
1102                 read_len += sep + 2 - data;
1103                 data = sep + 2;
1104
1105                 if (!uh->read_chunked) {
1106                         uh->eof = true;
1107                         uh->uc.data_eof = true;
1108                 }
1109         }
1110
1111         if (len > data_end - data)
1112                 len = data_end - data;
1113
1114         if (uh->read_chunked >= 0) {
1115                 if (len > uh->read_chunked)
1116                         len = uh->read_chunked;
1117
1118                 uh->read_chunked -= len;
1119         } else if (uh->content_length >= 0) {
1120                 if (len > uh->content_length)
1121                         len = uh->content_length;
1122
1123                 uh->content_length -= len;
1124                 if (!uh->content_length) {
1125                         uh->eof = true;
1126                         uh->uc.data_eof = true;
1127                 }
1128         }
1129
1130         if (len > 0) {
1131                 read_len += len;
1132                 memcpy(buf, data, len);
1133         }
1134
1135         if (read_len > 0)
1136                 ustream_consume(uh->us, read_len);
1137
1138         uclient_notify_eof(uh);
1139
1140         /* Now that we consumed something and if this isn't EOF, start timer again */
1141         if (!uh->uc.eof && !cl->connection_timeout.pending)
1142                 uloop_timeout_set(&cl->connection_timeout, cl->timeout_msecs);
1143
1144         return len;
1145 }
1146
1147 int uclient_http_redirect(struct uclient *cl)
1148 {
1149         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
1150         struct blobmsg_policy location = {
1151                 .name = "location",
1152                 .type = BLOBMSG_TYPE_STRING,
1153         };
1154         struct uclient_url *url = cl->url;
1155         struct blob_attr *tb;
1156
1157         if (cl->backend != &uclient_backend_http)
1158                 return false;
1159
1160         switch (cl->status_code) {
1161         case 301:
1162         case 302:
1163         case 307:
1164                 break;
1165         default:
1166                 return false;
1167         }
1168
1169         blobmsg_parse(&location, 1, &tb, blob_data(uh->meta.head), blob_len(uh->meta.head));
1170         if (!tb)
1171                 return false;
1172
1173         url = uclient_get_url_location(url, blobmsg_data(tb));
1174         if (!url)
1175                 return false;
1176
1177         free(cl->url);
1178         cl->url = url;
1179         if (uclient_http_connect(cl))
1180                 return -1;
1181
1182         uclient_http_request_done(cl);
1183
1184         return true;
1185 }
1186
1187 int uclient_http_set_ssl_ctx(struct uclient *cl, const struct ustream_ssl_ops *ops,
1188                              struct ustream_ssl_ctx *ctx, bool require_validation)
1189 {
1190         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
1191
1192         if (cl->backend != &uclient_backend_http)
1193                 return -1;
1194
1195         uclient_http_free_url_state(cl);
1196
1197         uclient_http_free_ssl_ctx(uh);
1198         uh->ssl_ops = ops;
1199         uh->ssl_ctx = ctx;
1200         uh->ssl_require_validation = !!ctx && require_validation;
1201
1202         return 0;
1203 }
1204
1205 int uclient_http_set_address_family(struct uclient *cl, int af)
1206 {
1207         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
1208
1209         if (cl->backend != &uclient_backend_http)
1210                 return -1;
1211
1212         switch (af) {
1213         case AF_INET:
1214                 uh->usock_flags = USOCK_IPV4ONLY;
1215                 break;
1216         case AF_INET6:
1217                 uh->usock_flags = USOCK_IPV6ONLY;
1218                 break;
1219         default:
1220                 uh->usock_flags = 0;
1221                 break;
1222         }
1223
1224         return 0;
1225 }
1226
1227 const struct uclient_backend uclient_backend_http = {
1228         .prefix = uclient_http_prefix,
1229
1230         .alloc = uclient_http_alloc,
1231         .free = uclient_http_free,
1232         .connect = uclient_http_connect,
1233         .disconnect = uclient_http_request_disconnect,
1234         .update_url = uclient_http_free_url_state,
1235         .update_proxy_url = uclient_http_free_url_state,
1236
1237         .read = uclient_http_read,
1238         .write = uclient_http_send_data,
1239         .request = uclient_http_request_done,
1240 };