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