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