uclient-http.c

   1 #include <stdio.h>
   2 #include <ctype.h>
   3 #include <unistd.h>
   4
   5 #include <libubox/ustream.h>
   6 #include <libubox/ustream-ssl.h>
   7 #include <libubox/usock.h>
   8 #include <libubox/blobmsg.h>
   9
  10 #include "uclient.h"
  11 #include "uclient-utils.h"
  12 #include "uclient-backend.h"
  13
  14 static struct ustream_ssl_ctx *ssl_ctx;
  15
  16 enum request_type {
  17         REQ_GET,
  18         REQ_HEAD,
  19         REQ_POST,
  20         __REQ_MAX
  21 };
  22
  23 enum http_state {
  24         HTTP_STATE_INIT,
  25         HTTP_STATE_HEADERS_SENT,
  26         HTTP_STATE_REQUEST_DONE,
  27         HTTP_STATE_RECV_HEADERS,
  28         HTTP_STATE_RECV_DATA,
  29         HTTP_STATE_ERROR,
  30 };
  31
  32 static const char * const request_types[__REQ_MAX] = {
  33         [REQ_GET] = "GET",
  34         [REQ_HEAD] = "HEAD",
  35         [REQ_POST] = "POST",
  36 };
  37
  38 struct uclient_http {
  39         struct uclient uc;
  40
  41         struct ustream *us;
  42
  43         struct ustream_fd ufd;
  44         struct ustream_ssl ussl;
  45
  46         bool ssl;
  47         enum request_type req_type;
  48         enum http_state state;
  49
  50         unsigned int send_len;
  51
  52         struct blob_buf headers;
  53         struct blob_buf meta;
  54 };
  55
  56 enum {
  57         PREFIX_HTTP,
  58         PREFIX_HTTPS,
  59         __PREFIX_MAX,
  60 };
  61
  62 static const char * const uclient_http_prefix[] = {
  63         [PREFIX_HTTP] = "http://",
  64         [PREFIX_HTTPS] = "https://",
  65         [__PREFIX_MAX] = NULL
  66 };
  67
  68 static int uclient_do_connect(struct uclient_http *uh, const char *port)
  69 {
  70         int fd;
  71
  72         if (uh->uc.url->port)
  73                 port = uh->uc.url->port;
  74
  75         fd = usock(USOCK_TCP | USOCK_NONBLOCK, uh->uc.url->host, port);
  76         if (fd < 0)
  77                 return -1;
  78
  79         ustream_fd_init(&uh->ufd, fd);
  80         return 0;
  81 }
  82
  83 static void uclient_notify_eof(struct uclient_http *uh)
  84 {
  85         struct ustream *us = uh->us;
  86
  87         if (!us->eof && !us->write_error)
  88                 return;
  89
  90         if (ustream_pending_data(us, false))
  91                 return;
  92
  93         uclient_backend_set_eof(&uh->uc);
  94 }
  95
  96 static void uclient_parse_http_line(struct uclient_http *uh, char *data)
  97 {
  98         char *name;
  99         char *sep;
 100
 101         if (uh->state == HTTP_STATE_REQUEST_DONE) {
 102                 uh->state = HTTP_STATE_RECV_HEADERS;
 103                 return;
 104         }
 105
 106         if (!*data) {
 107                 uh->state = HTTP_STATE_RECV_DATA;
 108                 uh->uc.meta = uh->meta.head;
 109                 if (uh->uc.cb->header_done)
 110                         uh->uc.cb->header_done(&uh->uc);
 111                 return;
 112         }
 113
 114         sep = strchr(data, ':');
 115         if (!sep)
 116                 return;
 117
 118         *(sep++) = 0;
 119
 120         for (name = data; *name; name++)
 121                 *name = tolower(*name);
 122
 123         name = data;
 124         while (isspace(*sep))
 125                 sep++;
 126
 127         blobmsg_add_string(&uh->meta, name, sep);
 128 }
 129
 130 static void __uclient_notify_read(struct uclient_http *uh)
 131 {
 132         struct uclient *uc = &uh->uc;
 133         char *data;
 134         int len;
 135
 136         if (uh->state < HTTP_STATE_REQUEST_DONE)
 137                 return;
 138
 139         data = ustream_get_read_buf(uh->us, &len);
 140         if (!data || !len)
 141                 return;
 142
 143         if (uh->state < HTTP_STATE_RECV_DATA) {
 144                 char *sep;
 145                 int cur_len;
 146
 147                 do {
 148                         sep = strstr(data, "\r\n");
 149                         if (!sep)
 150                                 break;
 151
 152                         /* Check for multi-line HTTP headers */
 153                         if (sep > data) {
 154                                 if (!sep[2])
 155                                         return;
 156
 157                                 if (isspace(sep[2]) && sep[2] != '\r') {
 158                                         sep[0] = ' ';
 159                                         sep[1] = ' ';
 160                                         continue;
 161                                 }
 162                         }
 163
 164                         *sep = 0;
 165                         cur_len = sep + 2 - data;
 166                         uclient_parse_http_line(uh, data);
 167                         ustream_consume(uh->us, cur_len);
 168                         len -= cur_len;
 169
 170                         data = ustream_get_read_buf(uh->us, &len);
 171                 } while (uh->state < HTTP_STATE_RECV_DATA);
 172
 173                 if (!len)
 174                         return;
 175         }
 176
 177         if (uh->state == HTTP_STATE_RECV_DATA && uc->cb->data_read)
 178                 uc->cb->data_read(uc);
 179 }
 180
 181 static void uclient_notify_read(struct ustream *us, int bytes)
 182 {
 183         struct uclient_http *uh = container_of(us, struct uclient_http, ufd.stream);
 184
 185         __uclient_notify_read(uh);
 186 }
 187
 188 static void uclient_notify_state(struct ustream *us)
 189 {
 190         struct uclient_http *uh = container_of(us, struct uclient_http, ufd.stream);
 191
 192         uclient_notify_eof(uh);
 193 }
 194
 195 static int uclient_setup_http(struct uclient_http *uh)
 196 {
 197         struct ustream *us = &uh->ufd.stream;
 198         int ret;
 199
 200         uh->us = us;
 201         us->string_data = true;
 202         us->notify_state = uclient_notify_state;
 203         us->notify_read = uclient_notify_read;
 204
 205         ret = uclient_do_connect(uh, "80");
 206         if (ret)
 207                 return ret;
 208
 209         return 0;
 210 }
 211
 212 static void uclient_ssl_notify_read(struct ustream *us, int bytes)
 213 {
 214         struct uclient_http *uh = container_of(us, struct uclient_http, ussl.stream);
 215
 216         __uclient_notify_read(uh);
 217 }
 218
 219 static void uclient_ssl_notify_state(struct ustream *us)
 220 {
 221         struct uclient_http *uh = container_of(us, struct uclient_http, ussl.stream);
 222
 223         uclient_notify_eof(uh);
 224 }
 225
 226 static int uclient_setup_https(struct uclient_http *uh)
 227 {
 228         struct ustream *us = &uh->ussl.stream;
 229         int ret;
 230
 231         uh->ssl = true;
 232         uh->us = us;
 233
 234         ret = uclient_do_connect(uh, "443");
 235         if (ret)
 236                 return ret;
 237
 238         if (!ssl_ctx)
 239                 ssl_ctx = ustream_ssl_context_new(false);
 240
 241         us->string_data = true;
 242         us->notify_state = uclient_ssl_notify_state;
 243         us->notify_read = uclient_ssl_notify_read;
 244         ustream_ssl_init(&uh->ussl, &uh->ufd.stream, ssl_ctx, false);
 245
 246         return 0;
 247 }
 248
 249 static void uclient_http_disconnect(struct uclient_http *uh)
 250 {
 251         uclient_backend_reset_state(&uh->uc);
 252
 253         if (!uh->us)
 254                 return;
 255
 256         if (uh->ssl)
 257                 ustream_free(&uh->ussl.stream);
 258         ustream_free(&uh->ufd.stream);
 259         close(uh->ufd.fd.fd);
 260         uh->us = NULL;
 261 }
 262
 263 static int uclient_http_connect(struct uclient *cl)
 264 {
 265         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 266
 267         uclient_http_disconnect(uh);
 268         blob_buf_init(&uh->meta, 0);
 269
 270         uh->ssl = cl->url->prefix == PREFIX_HTTPS;
 271         uh->state = HTTP_STATE_INIT;
 272
 273         if (uh->ssl)
 274                 return uclient_setup_https(uh);
 275         else
 276                 return uclient_setup_http(uh);
 277 }
 278
 279 static struct uclient *uclient_http_alloc(void)
 280 {
 281         struct uclient_http *uh;
 282
 283         uh = calloc_a(sizeof(*uh));
 284         blob_buf_init(&uh->headers, 0);
 285
 286         return &uh->uc;
 287 }
 288
 289 static void uclient_http_free(struct uclient *cl)
 290 {
 291         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 292
 293         uclient_http_disconnect(uh);
 294         blob_buf_free(&uh->headers);
 295         blob_buf_free(&uh->meta);
 296         free(uh);
 297 }
 298
 299 int
 300 uclient_http_set_request_type(struct uclient *cl, const char *type)
 301 {
 302         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 303         int i;
 304
 305         if (cl->backend != &uclient_backend_http)
 306                 return -1;
 307
 308         if (uh->state > HTTP_STATE_INIT)
 309                 return -1;
 310
 311         for (i = 0; i < ARRAY_SIZE(request_types); i++) {
 312                 if (strcmp(request_types[i], type) != 0)
 313                         continue;
 314
 315                 uh->req_type = i;
 316                 return 0;
 317         }
 318
 319         return -1;
 320 }
 321
 322 int
 323 uclient_http_reset_headers(struct uclient *cl, const char *name, const char *value)
 324 {
 325         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 326
 327         blob_buf_init(&uh->headers, 0);
 328
 329         return 0;
 330 }
 331
 332 int
 333 uclient_http_set_header(struct uclient *cl, const char *name, const char *value)
 334 {
 335         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 336
 337         if (cl->backend != &uclient_backend_http)
 338                 return -1;
 339
 340         if (uh->state > HTTP_STATE_INIT)
 341                 return -1;
 342
 343         blobmsg_add_string(&uh->headers, name, value);
 344         return 0;
 345 }
 346
 347 #define ustream_printf(us, ...) do { \
 348         fprintf(stderr, "send: " __VA_ARGS__); \
 349         ustream_printf(us, __VA_ARGS__); \
 350 } while (0)
 351
 352
 353 static void
 354 uclient_http_send_headers(struct uclient_http *uh)
 355 {
 356         struct uclient_url *url = uh->uc.url;
 357         struct blob_attr *cur;
 358         int rem;
 359
 360         if (uh->state >= HTTP_STATE_HEADERS_SENT)
 361                 return;
 362
 363         ustream_printf(uh->us,
 364                 "%s /%s HTTP/1.0\r\n"
 365                 "Host: %s\r\n",
 366                 request_types[uh->req_type],
 367                 url->location, url->host);
 368
 369         blobmsg_for_each_attr(cur, uh->headers.head, rem)
 370                 ustream_printf(uh->us, "%s: %s\n", blobmsg_name(cur), (char *) blobmsg_data(cur));
 371
 372         if (url->auth) {
 373                 int auth_len = strlen(url->auth);
 374                 char *auth_buf;
 375
 376                 if (auth_len > 512)
 377                         return;
 378
 379                 auth_buf = alloca(base64_len(auth_len) + 1);
 380                 base64_encode(url->auth, auth_len, auth_buf);
 381                 ustream_printf(uh->us, "Authorization: Basic %s\r\n", auth_buf);
 382         }
 383
 384         if (uh->send_len > 0)
 385                 ustream_printf(uh->us, "Content-Length: %d", uh->send_len);
 386
 387         ustream_printf(uh->us, "\r\n");
 388 }
 389
 390 static int
 391 uclient_http_set_write_len(struct uclient *cl, unsigned int len)
 392 {
 393         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 394
 395         if (uh->state >= HTTP_STATE_HEADERS_SENT)
 396                 return -1;
 397
 398         if (uh->req_type == REQ_GET || uh->req_type == REQ_HEAD) {
 399                 fprintf(stderr, "Sending data is not supported for %s requests\n",
 400                         request_types[uh->req_type]);
 401                 return -1;
 402         }
 403
 404         uh->send_len = len;
 405         return 0;
 406 }
 407
 408 static int
 409 uclient_http_send_data(struct uclient *cl, char *buf, unsigned int len)
 410 {
 411         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 412
 413         if (uh->state >= HTTP_STATE_REQUEST_DONE)
 414                 return -1;
 415
 416         uclient_http_send_headers(uh);
 417
 418         if (len > uh->send_len) {
 419                 fprintf(stderr, "%s: ignoring %d extra data bytes\n", __func__, uh->send_len - len);
 420                 len = uh->send_len;
 421         }
 422
 423         ustream_write(uh->us, buf, len, false);
 424
 425         return len;
 426 }
 427
 428 static int
 429 uclient_http_request_done(struct uclient *cl)
 430 {
 431         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 432
 433         if (uh->state >= HTTP_STATE_REQUEST_DONE)
 434                 return -1;
 435
 436         if (uh->send_len > 0)
 437                 fprintf(stderr, "%s: missing %d POST data bytes\n", __func__, uh->send_len);
 438
 439         uclient_http_send_headers(uh);
 440         uh->state = HTTP_STATE_REQUEST_DONE;
 441
 442         return 0;
 443 }
 444
 445 static int
 446 uclient_http_read(struct uclient *cl, char *buf, unsigned int len)
 447 {
 448         struct uclient_http *uh = container_of(cl, struct uclient_http, uc);
 449         int data_len;
 450         char *data;
 451
 452         if (uh->state < HTTP_STATE_RECV_DATA)
 453                 return 0;
 454
 455         data = ustream_get_read_buf(uh->us, &data_len);
 456         if (!data || !data_len)
 457                 return 0;
 458
 459         if (len > data_len)
 460                 len = data_len;
 461
 462         memcpy(buf, data, len);
 463         ustream_consume(uh->us, len);
 464         uclient_notify_eof(uh);
 465
 466         return len;
 467 }
 468
 469 const struct uclient_backend uclient_backend_http __hidden = {
 470         .prefix = uclient_http_prefix,
 471
 472         .alloc = uclient_http_alloc,
 473         .free = uclient_http_free,
 474         .connect = uclient_http_connect,
 475
 476         .read = uclient_http_read,
 477         .write = uclient_http_send_data,
 478         .request = uclient_http_request_done,
 479
 480         .set_write_len = uclient_http_set_write_len,
 481 };