util.c 38.6 KB
Newer Older
1 2
/* Icecast
 *
3
 *  Copyright 2000-2004 Jack Moffitt <jack@xiph.org,
4 5 6 7
 *                      Michael Smith <msmith@xiph.org>,
 *                      oddsock <oddsock@xiph.org>,
 *                      Karl Heyes <karl@xiph.org>
 *                      and others (see AUTHORS for details).
8
 *  Copyright 2012-2018 Philipp "ph3-der-loewe" Schafft <lion@lion.leolix.org>
9 10 11 12
 *
 *  This program is distributed under the GNU General Public License, version 2.
 *  A copy of this license is included with this source.
 *
13 14
 */

15 16 17 18
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

Jack Moffitt's avatar
Jack Moffitt committed
19
#include <sys/types.h>
20
#include <ctype.h>
21 22
#include <stdio.h>
#include <string.h>
23
#include <stdlib.h>
Jack Moffitt's avatar
Jack Moffitt committed
24

25 26 27 28 29 30 31
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_WINSOCK2_H
#include <winsock2.h>
#endif

Jack Moffitt's avatar
Jack Moffitt committed
32
#ifndef _WIN32
33
#include <sys/time.h>
Jack Moffitt's avatar
Jack Moffitt committed
34
#include <unistd.h>
35
#ifdef HAVE_POLL
36
#include <poll.h>
37
#endif
38 39
#else
#include <windows.h>
Jack Moffitt's avatar
Jack Moffitt committed
40 41
#endif

42 43
#include "common/net/sock.h"
#include "common/thread/thread.h"
Jack Moffitt's avatar
Jack Moffitt committed
44

45
#include "util.h"
46
#include "compat.h"
47
#include "cfgfile.h"
48 49 50
#include "refbuf.h"
#include "connection.h"
#include "client.h"
51
#include "source.h"
52
#include "admin.h"
53 54 55 56

#define CATMODULE "util"

#include "logging.h"
Jack Moffitt's avatar
Jack Moffitt committed
57

58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109
/* first all static tables, then the code */

static const char hexchars[16] = {
    '0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'
};

static const char safechars[256] = {
    0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
    0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
    0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
    1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  0,  0,  0,  0,  0,  0,
    0,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,
    1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  0,  0,  0,  0,  0,
    0,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,
    1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  0,  0,  0,  0,  0,
    0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
    0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
    0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
    0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
    0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
    0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
    0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
    0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
};

static const char base64table[64] = {
    'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P',
    'Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d','e','f',
    'g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v',
    'w','x','y','z','0','1','2','3','4','5','6','7','8','9','+','/'
};

static const signed char base64decode[256] = {
     -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
     -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
     -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, 62, -2, -2, -2, 63,
     52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -2, -2, -2, -1, -2, -2,
     -2,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14,
     15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -2, -2, -2, -2, -2,
     -2, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
     41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -2, -2, -2, -2, -2,
     -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
     -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
     -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
     -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
     -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
     -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
     -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
     -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2
};


110 111 112 113 114 115 116 117 118
/* Abstract out an interface to use either poll or select depending on which
 * is available (poll is preferred) to watch a single fd.
 *
 * timeout is in milliseconds.
 *
 * returns > 0 if activity on the fd occurs before the timeout.
 *           0 if no activity occurs
 *         < 0 for error.
 */
119
int util_timed_wait_for_fd(sock_t fd, int timeout)
120 121 122 123 124 125 126 127 128 129 130
{
#ifdef HAVE_POLL
    struct pollfd ufds;

    ufds.fd = fd;
    ufds.events = POLLIN;
    ufds.revents = 0;

    return poll(&ufds, 1, timeout);
#else
    fd_set rfds;
131
    struct timeval tv, *p=NULL;
132 133 134 135

    FD_ZERO(&rfds);
    FD_SET(fd, &rfds);

136 137 138 139 140 141
    if(timeout >= 0) {
        tv.tv_sec = timeout/1000;
        tv.tv_usec = (timeout % 1000)*1000;
        p = &tv;
    }
    return select(fd+1, &rfds, NULL, NULL, p);
142 143 144
#endif
}

145
int util_read_header(sock_t sock, char *buff, unsigned long len, int entire)
Jack Moffitt's avatar
Jack Moffitt committed
146
{
147 148 149 150
    int read_bytes, ret;
    unsigned long pos;
    char c;
    ice_config_t *config;
151
    int header_timeout;
Jack Moffitt's avatar
Jack Moffitt committed
152

153
    config = config_get_config();
154 155
    header_timeout = config->header_timeout;
    config_release_config();
Jack Moffitt's avatar
Jack Moffitt committed
156

157 158 159
    read_bytes = 1;
    pos = 0;
    ret = 0;
Jack Moffitt's avatar
Jack Moffitt committed
160

161 162
    while ((read_bytes == 1) && (pos < (len - 1))) {
        read_bytes = 0;
Jack Moffitt's avatar
Jack Moffitt committed
163

164
        if (util_timed_wait_for_fd(sock, header_timeout*1000) > 0) {
165 166
            if ((read_bytes = recv(sock, &c, 1, 0))) {
                if (c != '\r') buff[pos++] = c;
167
                if (entire) {
168
                    if ((pos > 1) && (buff[pos - 1] == '\n' &&
169 170 171 172 173 174 175 176 177 178
                                      buff[pos - 2] == '\n')) {
                        ret = 1;
                        break;
                    }
                }
                else {
                    if ((pos > 1) && (buff[pos - 1] == '\n')) {
                        ret = 1;
                        break;
                    }
179 180 181 182 183 184 185 186
                }
            }
        } else {
            break;
        }
    }

    if (ret) buff[pos] = '\0';
187

188
    return ret;
Jack Moffitt's avatar
Jack Moffitt committed
189 190
}

191
char *util_get_extension(const char *path) {
192 193 194 195 196 197 198 199
    char *ext = strrchr(path, '.');

    if(ext == NULL)
        return "";
    else
        return ext+1;
}

200
int util_check_valid_extension(const char *uri) {
201
    const char    *p2;
202

203 204 205 206 207 208 209 210 211 212 213 214
    if (!uri)
        return UNKNOWN_CONTENT;

    p2 = strrchr(uri, '.');
    if (!p2)
        return UNKNOWN_CONTENT;
    p2++;

    if (strcmp(p2, "xsl") == 0 || strcmp(p2, "xslt") == 0) {
        return XSLT_CONTENT;
    } else if (strcmp(p2, "htm") == 0 || strcmp(p2, "html") == 0) {
        return HTML_CONTENT;
215
    }
216 217

    return UNKNOWN_CONTENT;
218
}
Jack Moffitt's avatar
Jack Moffitt committed
219

220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251
static int hex(char c)
{
    if(c >= '0' && c <= '9')
        return c - '0';
    else if(c >= 'A' && c <= 'F')
        return c - 'A' + 10;
    else if(c >= 'a' && c <= 'f')
        return c - 'a' + 10;
    else
        return -1;
}

static int verify_path(char *path) {
    int dir = 0, indotseq = 0;

    while(*path) {
        if(*path == '/' || *path == '\\') {
            if(indotseq)
                return 0;
            if(dir)
                return 0;
            dir = 1;
            path++;
            continue;
        }

        if(dir || indotseq) {
            if(*path == '.')
                indotseq = 1;
            else
                indotseq = 0;
        }
252

253 254 255 256 257 258 259
        dir = 0;
        path++;
    }

    return 1;
}

260 261 262 263 264 265 266 267 268 269 270 271 272
char *util_get_path_from_uri(char *uri) {
    char *path = util_normalise_uri(uri);
    char *fullpath;

    if(!path)
        return NULL;
    else {
        fullpath = util_get_path_from_normalised_uri(path);
        free(path);
        return fullpath;
    }
}

273
char *util_get_path_from_normalised_uri(const char *uri) {
274
    char *fullpath;
275 276
    char *webroot;
    ice_config_t *config = config_get_config();
277

278 279 280
    webroot = config->webroot_dir;

    fullpath = malloc(strlen(uri) + strlen(webroot) + 1);
281 282 283
    if (fullpath)
        sprintf (fullpath, "%s%s", webroot, uri);
    config_release_config();
284 285 286 287

    return fullpath;
}

288
char *util_url_escape (const char *src)
289
{
290 291
    size_t len;
    char *dst;
292
    unsigned char *source = (unsigned char *)src;
293
    size_t i, j;
294

295 296 297 298 299 300 301 302
    if (!src)
        return NULL;

    len = strlen(src);
    /* Efficiency not a big concern here, keep the code simple/conservative */
    dst = calloc(1, len*3 + 1);

    for(i = 0, j = 0; i < len; i++) {
303 304
        if(safechars[source[i]]) {
            dst[j++] = source[i];
305 306 307 308
        } else {
            dst[j++] = '%';
            dst[j++] = hexchars[(source[i] >> 4) & 0x0F];
            dst[j++] = hexchars[ source[i]       & 0x0F];
309 310 311 312 313 314 315
        }
    }

    dst[j] = 0;
    return dst;
}

316
char *util_url_unescape (const char *src)
317 318
{
    int len = strlen(src);
319
    char *decoded;
320
    int i;
321
    char *dst;
322 323
    int done = 0;

324
    decoded = calloc(1, len + 1);
325

326
    dst = decoded;
327

328 329
    for(i=0; i < len; i++) {
        switch(src[i]) {
330
            case '%':
331 332
                if(i+2 >= len) {
                    free(decoded);
333 334
                    return NULL;
                }
335 336
                if(hex(src[i+1]) == -1 || hex(src[i+2]) == -1 ) {
                    free(decoded);
337 338 339
                    return NULL;
                }

340
                *dst++ = hex(src[i+1]) * 16  + hex(src[i+2]);
341 342 343 344 345 346
                i+= 2;
                break;
            case '#':
                done = 1;
                break;
            case 0:
347
                ICECAST_LOG_ERROR("Fatal internal logic error in util_url_unescape()");
348
                free(decoded);
349 350 351
                return NULL;
                break;
            default:
352
                *dst++ = src[i];
353 354 355 356 357 358 359 360
                break;
        }
        if(done)
            break;
    }

    *dst = 0; /* null terminator */

361 362 363 364 365 366 367 368
    return decoded;
}

/* Get an absolute path (from the webroot dir) from a URI. Return NULL if the
 * path contains 'disallowed' sequences like foo/../ (which could be used to
 * escape from the webroot) or if it cannot be URI-decoded.
 * Caller should free the path.
 */
369
char *util_normalise_uri(const char *uri) {
370
    char *path;
371 372 373
#ifdef _WIN32
    size_t len;
#endif
374 375 376 377

    if(uri[0] != '/')
        return NULL;

378
    path = util_url_unescape(uri);
379 380

    if(path == NULL) {
381
        ICECAST_LOG_WARN("Error decoding URI: %s\n", uri);
382 383 384
        return NULL;
    }

385 386 387 388 389 390
#ifdef _WIN32
    /* If we are on Windows, strip trailing dots, as Win API strips it anyway */
    for (len = strlen(path); len > 0 && path[len-1] == '.'; len--)
        path[len-1] = '\0';
#endif

391 392
    /* We now have a full URI-decoded path. Check it for allowability */
    if(verify_path(path))
393
        return path;
394
    else {
395
        ICECAST_LOG_WARN("Rejecting invalid path \"%s\"", path);
396 397 398 399
        free(path);
        return NULL;
    }
}
Jack Moffitt's avatar
Jack Moffitt committed
400

401 402 403 404 405
char *util_bin_to_hex(unsigned char *data, int len)
{
    char *hex = malloc(len*2 + 1);
    int i;

406
    for (i = 0; i < len; i++) {
407 408 409 410 411 412 413 414 415
        hex[i*2] = hexchars[(data[i]&0xf0) >> 4];
        hex[i*2+1] = hexchars[data[i]&0x0f];
    }

    hex[len*2] = 0;

    return hex;
}

416
/* This isn't efficient, but it doesn't need to be */
417
char *util_base64_encode(const char *data, size_t len) {
418 419
    char *out = malloc(len*4/3 + 4);
    char *result = out;
420
    size_t chunk;
421 422

    while(len > 0) {
423
        chunk = (len > 3) ? 3 : len;
424
        *out++ = base64table[(*data & 0xFC)>>2];
425

426 427
        switch(chunk) {
            case 3:
428
                *out++ = base64table[((*data & 0x03)<<4) | ((*(data+1) & 0xF0) >> 4)];
429 430
                *out++ = base64table[((*(data+1) & 0x0F)<<2) | ((*(data+2) & 0xC0)>>6)];
                *out++ = base64table[(*(data+2)) & 0x3F];
431
            break;
432
            case 2:
433
                *out++ = base64table[((*data & 0x03)<<4) | ((*(data+1) & 0xF0) >> 4)];
434 435
                *out++ = base64table[((*(data+1) & 0x0F)<<2)];
                *out++ = '=';
436
            break;
437
            case 1:
438
                *out++ = base64table[((*data & 0x03)<<4)];
439 440
                *out++ = '=';
                *out++ = '=';
441
            break;
442 443 444 445
        }
        data += chunk;
        len -= chunk;
    }
446
    *out = 0;
447 448 449 450

    return result;
}

451
char *util_base64_decode(const char *data)
452
{
453 454
    const unsigned char *input = (const unsigned char *)data;
    int len = strlen (data);
455 456 457 458 459 460 461 462 463 464 465
    char *out = malloc(len*3/4 + 5);
    char *result = out;
    signed char vals[4];

    while(len > 0) {
        if(len < 4)
        {
            free(result);
            return NULL; /* Invalid Base64 data */
        }

466 467 468 469
        vals[0] = base64decode[*input++];
        vals[1] = base64decode[*input++];
        vals[2] = base64decode[*input++];
        vals[3] = base64decode[*input++];
470 471

        if(vals[0] < 0 || vals[1] < 0 || vals[2] < -1 || vals[3] < -1) {
472
            len -= 4;
473 474 475 476
            continue;
        }

        *out++ = vals[0]<<2 | vals[1]>>4;
477 478 479 480
        /* vals[3] and (if that is) vals[2] can be '=' as padding, which is
           looked up in the base64decode table as '-1'. Check for this case,
           and output zero-terminators instead of characters if we've got
           padding. */
481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497
        if(vals[2] >= 0)
            *out++ = ((vals[1]&0x0F)<<4) | (vals[2]>>2);
        else
            *out++ = 0;

        if(vals[3] >= 0)
            *out++ = ((vals[2]&0x03)<<6) | (vals[3]);
        else
            *out++ = 0;

        len -= 4;
    }
    *out = 0;

    return result;
}

498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537
util_hostcheck_type util_hostcheck(const char *hostname) {
    const char * p;
    size_t colon_count;

    if (!hostname)
        return HOSTCHECK_ERROR;

    if (strcmp(hostname, "localhost") == 0 ||
        strcmp(hostname, "localhost.localdomain") == 0 ||
        strcmp(hostname, "localhost.localnet") == 0)
        return HOSTCHECK_IS_LOCALHOST;

    for (p = hostname; *p; p++)
        if (!( (*p >= '0' && *p <= '9') || *p == '.'))
            break;
    if (!*p)
        return HOSTCHECK_IS_IPV4;

    for (p = hostname, colon_count = 0; *p; p++) {
        if (*p == ':') {
            colon_count++;
            continue;
        }
        if (!((*p >= 'a' && *p <= 'f') || (*p >= '0' && *p <= '9') || *p == ':'))
            break;
    }
    if (!*p && colon_count)
        return HOSTCHECK_IS_IPV6;

    for (p = hostname; *p; p++)
        if (!( (*p >= 'a' && *p <= 'z') || (*p >= '0' && *p <= '9') || *p == '.' || *p == '-' ))
            return HOSTCHECK_BADCHAR;

    for (p = hostname, colon_count = 0; *p && *p != '.'; p++);
    if (!*p)
        return HOSTCHECK_NOT_FQDN;

    return HOSTCHECK_SANE;
}

538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555
int util_str_to_bool(const char *str) {
    /* consider NULL and empty strings false */
    if (!str || !*str)
        return 0;

    /* common words for true values */
    if (strcasecmp(str, "true") == 0 ||
        strcasecmp(str, "yes")  == 0 ||
        strcasecmp(str, "on")   == 0 )
        return 1;

    /* old style numbers: consider everyting non-zero true */
    if (atoi(str))
        return 1;

    /* we default to no */
    return 0;
}
556

557 558 559 560 561 562 563 564 565 566 567 568 569 570
int util_str_to_loglevel(const char *str) {
    if (strcasecmp(str, "debug") == 0 || strcasecmp(str, "DBUG") == 0)
        return ICECAST_LOGLEVEL_DEBUG;
    if (strcasecmp(str, "information") == 0 || strcasecmp(str, "INFO") == 0)
        return ICECAST_LOGLEVEL_INFO;
    if (strcasecmp(str, "warning") == 0 || strcasecmp(str, "WARN") == 0)
        return ICECAST_LOGLEVEL_WARN;
    if (strcasecmp(str, "error") == 0 || strcasecmp(str, "EROR") == 0)
        return ICECAST_LOGLEVEL_ERROR;

    /* gussing it is old-style numerical setting */
    return atoi(str);
}

571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599
int util_str_to_int(const char *str, const int default_value)
{
    /* consider NULL and empty strings default */
    if (!str || !*str)
        return default_value;
    return atoi(str);
}

unsigned int util_str_to_unsigned_int(const char *str, const unsigned int default_value)
{
    long int val;
    char *rem = NULL;

    /* consider NULL and empty strings default */
    if (!str || !*str)
        return default_value;

    val = strtol(str, &rem, 10);

    /* There is a left over */
    if (rem && *rem)
        return default_value;

    if (val < 0)
        return default_value;

    return (unsigned int)(unsigned long int)val;
}

600
/* TODO, FIXME: handle memory allocation errors better. */
601
static inline void   _build_headers_loop(char **ret, size_t *len, ice_config_http_header_t *header, int status) {
602 603 604
    size_t headerlen;
    const char *name;
    const char *value;
605 606
    char *r = *ret;
    char *n;
607

608 609 610 611 612 613 614 615
    if (!header)
        return;

    do {
        /* filter out header's we don't use. */
        if (header->status != 0 && header->status != status) continue;

        /* get the name of the header */
616
        name = header->name;
617 618

        /* handle type of the header */
619
        value = NULL;
620 621 622 623 624
        switch (header->type) {
            case HTTP_HEADER_TYPE_STATIC:
                value = header->value;
                break;
        }
625

626 627 628 629
        /* check data */
        if (!name || !value)
            continue;

630
        /* append the header to the buffer */
631
        headerlen = strlen(name) + strlen(value) + 4;
632
        *len += headerlen;
633 634 635 636 637 638 639 640 641 642 643
        n = realloc(r, *len);
        if (n) {
            r = n;
            strcat(r, name);
            strcat(r, ": ");
            strcat(r, value);
            strcat(r, "\r\n");
        } else {
            /* FIXME: we skip this header. We should do better. */
            *len -= headerlen;
        }
644
    } while ((header = header->next));
645 646 647 648 649 650 651 652 653 654 655 656 657
    *ret = r;
}
static inline char * _build_headers(int status, ice_config_t *config, source_t *source) {
    mount_proxy *mountproxy = NULL;
    char *ret = NULL;
    size_t len = 1;

    if (source)
        mountproxy = config_find_mount(config, source->mount, MOUNT_TYPE_NORMAL);

    ret = calloc(1, 1);
    *ret = 0;

658
    _build_headers_loop(&ret, &len, config->http_headers, status);
659
    if (mountproxy && mountproxy->http_headers)
660
        _build_headers_loop(&ret, &len, mountproxy->http_headers, status);
661

662 663 664
    return ret;
}

665 666 667 668
ssize_t util_http_build_header(char * out, size_t len, ssize_t offset,
        int cache,
        int status, const char * statusmsg,
        const char * contenttype, const char * charset,
669
        const char * datablock,
670
        source_t * source, client_t * client) {
671 672 673 674
    const char * http_version = "1.0";
    ice_config_t *config;
    time_t now;
    struct tm result;
675 676
    struct tm *gmtime_result;
    char currenttime_buffer[80];
677 678 679
    char status_buffer[80];
    char contenttype_buffer[80];
    ssize_t ret;
680
    char * extra_headers;
681
    const char *connection_header = "Close";
682
    const char *upgrade_header = "";
683
    const char *allow_header;
684 685 686 687

    if (!out)
        return -1;

688
    if (client) {
689 690
        if (client->con->tlsmode != ICECAST_TLSMODE_DISABLED)
            upgrade_header = "Upgrade: TLS/1.0\r\n";
691 692 693
        switch (client->reuse) {
            case ICECAST_REUSE_CLOSE:      connection_header = "Close"; break;
            case ICECAST_REUSE_KEEPALIVE:  connection_header = "Keep-Alive"; break;
694
            case ICECAST_REUSE_UPGRADETLS: connection_header = "Upgrade"; upgrade_header = ""; break;
695 696 697
        }
    }

698 699 700 701 702 703 704 705 706 707 708 709 710
    if (offset == -1)
        offset = strlen (out);

    out += offset;
    len -= offset;

    if (status == -1)
    {
        status_buffer[0] = '\0';
    }
    else
    {
        if (!statusmsg)
711 712 713
        {
            switch (status)
            {
714
                case 100: statusmsg = "Continue"; http_version = "1.1"; break;
715
                case 101: statusmsg = "Switching Protocols"; http_version = "1.1"; break;
716
                case 200: statusmsg = "OK"; break;
717
                case 204: statusmsg = "No Content"; break;
718
                case 206: statusmsg = "Partial Content"; http_version = "1.1"; break;
719 720 721 722 723 724 725 726
                case 300: statusmsg = "Multiple Choices"; break;
                case 301: statusmsg = "Moved Permanently"; break;
                case 302: statusmsg = "Found"; break;
                case 303: statusmsg = "See Other"; break;
                case 304: statusmsg = "Not Modified"; break;
                case 305: statusmsg = "Use Proxy"; break;
                case 307: statusmsg = "Temporary Redirect"; break;
                case 308: statusmsg = "Permanent Redirect"; break;
727 728 729 730
                case 400: statusmsg = "Bad Request"; break;
                case 401: statusmsg = "Authentication Required"; break;
                case 403: statusmsg = "Forbidden"; break;
                case 404: statusmsg = "File Not Found"; break;
731 732 733
                case 405: statusmsg = "Method Not Allowed"; break;
                case 409: statusmsg = "Conflict"; break;
                case 415: statusmsg = "Unsupported Media Type"; break;
734
                case 416: statusmsg = "Request Range Not Satisfiable"; break;
735
                case 426: statusmsg = "Upgrade Required"; http_version = "1.1"; break;
736 737
                case 429: statusmsg = "Too Many Requests"; break;
                /* case of 500 is handled differently. No need to list it here. -- ph3-der-loewe, 2018-05-05 */
738
                case 501: statusmsg = "Unimplemented"; break;
739
                case 503: statusmsg = "Service Unavailable"; break;
740 741 742 743
                default:  statusmsg = "(unknown status code)"; break;
            }
        }
        snprintf (status_buffer, sizeof (status_buffer), "HTTP/%s %d %s\r\n", http_version, status, statusmsg);
744 745 746 747
    }

    if (contenttype)
    {
748
        if (charset)
749
            snprintf (contenttype_buffer, sizeof (contenttype_buffer), "Content-Type: %s; charset=%s\r\n",
750 751
                                                                       contenttype, charset);
        else
752 753 754 755 756 757 758 759 760
            snprintf (contenttype_buffer, sizeof (contenttype_buffer), "Content-Type: %s\r\n",
                                                                       contenttype);
    }
    else
    {
        contenttype_buffer[0] = '\0';
    }

    time(&now);
761 762 763 764 765 766 767 768 769 770
#ifndef _WIN32
    gmtime_result = gmtime_r(&now, &result);
#else
    /* gmtime() on W32 breaks POSIX and IS thread-safe (uses TLS) */
    gmtime_result = gmtime (&now);
    if (gmtime_result)
        memcpy (&result, gmtime_result, sizeof (result));
#endif

    if (gmtime_result)
771
        strftime(currenttime_buffer, sizeof(currenttime_buffer), "Date: %a, %d %b %Y %X GMT\r\n", gmtime_result);
772 773
    else
        currenttime_buffer[0] = '\0';
774

775 776 777 778 779 780 781 782 783 784 785 786
    if (client) {
        if (client->admin_command != ADMIN_COMMAND_ERROR) {
            allow_header = "GET, POST, OPTIONS";
        } else if (source) {
            allow_header = "GET, DELETE, OPTIONS";
        } else {
            allow_header = "GET, PUT, OPTIONS, SOURCE";
        }
    } else {
        allow_header = "GET, OPTIONS";
    }

787
    config = config_get_config();
788
    extra_headers = _build_headers(status, config, source);
789
    ret = snprintf (out, len, "%sServer: %s\r\nConnection: %s\r\nAccept-Encoding: identity\r\nAllow: %s\r\n%s%s%s%s%s%s%s%s",
790
                              status_buffer,
791
                              config->server_id,
792
                              connection_header,
793
                              allow_header,
794
                              upgrade_header,
795 796 797
                              currenttime_buffer,
                              contenttype_buffer,
                              (status == 401 ? "WWW-Authenticate: Basic realm=\"Icecast2 Server\"\r\n" : ""),
798
                              (cache     ? "" : "Cache-Control: no-cache, no-store\r\n"
799 800
                                                "Expires: Mon, 26 Jul 1997 05:00:00 GMT\r\n"
                                                "Pragma: no-cache\r\n"),
801
                              extra_headers,
802 803
                              (datablock ? "\r\n" : ""),
                              (datablock ? datablock : ""));
804
    free(extra_headers);
805 806 807 808 809
    config_release_config();

    return ret;
}

810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851
#define __SELECT_BEST_MAX_ARGS  8

struct __args {
    const char *comp;
    char *group;
    int best_comp;
    int best_group;
    int best_all;
};

static inline int __fill_arg(struct __args *arg, const char *str)
{
    char *delm;
    size_t len;

    arg->comp = str;
    arg->best_comp = 0;
    arg->best_group = 0;
    arg->best_all = 0;

    len = strlen(str);
    arg->group = malloc(len + 2);
    if (!arg->group)
        return -1;

    memcpy(arg->group, str, len + 1);

    delm = strstr(arg->group, "/");
    if (delm) {
        delm[0] = '/';
        delm[1] = '*';
        delm[2] = 0;
    }

    return 0;
}

static inline void __free_args(struct __args *arg, size_t len)
{
    size_t i;

    for (i = 0; i < len; i++) {
852
        free(arg[i].group);
853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049
    }
}

static inline int __parse_q(const char *str)
{
    int ret = 0;
    int mul = 1000;

    for (; *str; str++) {
        if (*str >= '0' && *str <= '9') {
            ret += mul * (*str - '0');
            mul /= 10;
        } else if (*str == '.') {
            mul = 100;
        } else {
            ICECAST_LOG_ERROR("Badly formated quality parameter found.");
            return -1;
        }
    }

    return ret;
}

static inline int __find_q_in_index(icecast_kva_t *kv, size_t idx)
{
    size_t i = kv->index[idx] + 1;
    size_t last;

    if (kv->indexlen <= (idx + 1)) {
        last = kv->kvlen - 1;
    } else {
        last = kv->index[idx + 1] - 1;
    }

    for (; i <= last; i++) {
        if (kv->kv[i].key && kv->kv[i].key && strcasecmp(kv->kv[i].key, "q") == 0) {
            return __parse_q(kv->kv[i].value);
        }
    }

    return 1000;
}

const char *util_http_select_best(const char *input, const char *first, ...)
{
    struct __args arg[__SELECT_BEST_MAX_ARGS];
    icecast_kva_t *kv;
    const char *p;
    size_t arglen = 1;
    size_t i, h;
    va_list ap;
    int q;
    int best_q = 0;

    if (__fill_arg(&(arg[0]), first) == -1) {
        ICECAST_LOG_ERROR("Can not allocate memory. Selecting first option.");
        return first;
    }
    va_start(ap, first);
    while ((p = (const char*)va_arg(ap, const char*))) {
        if (arglen == __SELECT_BEST_MAX_ARGS) {
            ICECAST_LOG_ERROR("More arguments given than supported. Currently %zu args are supported.", (size_t)__SELECT_BEST_MAX_ARGS);
            break;
        }
        if (__fill_arg(&(arg[arglen]), p) == -1) {
            ICECAST_LOG_ERROR("Can not allocate memory. Selecting first option.");
            __free_args(arg, arglen);
            return first;
        }

        arglen++;
    }
    va_end(ap);

    kv = util_parse_http_cn(input);
    if (!kv) {
        ICECAST_LOG_ERROR("Input string does not parse as KVA. Selecting first option.");
        __free_args(arg, arglen);
        return first;
    }

    ICECAST_LOG_DEBUG("--- DUMP ---");
    for (i = 0; i < kv->kvlen; i++) {
        ICECAST_LOG_DEBUG("kv[%zu] = {.key='%H', .value='%H'}", i, kv->kv[i].key, kv->kv[i].value);
    }
    for (i = 0; i < kv->indexlen; i++) {
        ICECAST_LOG_DEBUG("index[%zu] = %zu", i, kv->index[i]);
    }
    ICECAST_LOG_DEBUG("--- END OF DUMP ---");

    for (h = 0; h < arglen; h++) {
        for (i = 0; i < kv->indexlen; i++) {
            p = kv->kv[kv->index[i]].key;
            if (!p) {
                continue;
            }

            q = __find_q_in_index(kv, i);
            if (best_q < q) {
                best_q = q;
            }

            if (strcasecmp(p, arg[h].comp) == 0) {
                if (arg[h].best_comp < q) {
                    arg[h].best_comp = q;
                }
            }

            if (strcasecmp(p, arg[h].group) == 0) {
                if (arg[h].best_group < q) {
                    arg[h].best_group = q;
                }
            }
        }
    }

    util_kva_free(kv);

    p = NULL;
    for (h = 0; p == NULL && h < arglen; h++) {
        if (arg[h].best_comp == best_q) {
            p = arg[h].comp;
        }
    }
    for (h = 0; p == NULL && h < arglen; h++) {
        if (arg[h].best_group == best_q) {
            p = arg[h].comp;
        }
    }

    __free_args(arg, arglen);

    if (p == NULL) {
        p = first;
    }

    return p;
}

static inline void __skip_space(char **p)
{
    for (; **p == ' '; (*p)++);
}

static inline int __is_token(const char p)
{
    return (p >= 'a' && p <= 'z') || (p >= 'A' && p <= 'Z') || (p >= '0' && p <= '9') ||
            p == '!' || p == '#'  ||  p == '$' || p == '%'  ||  p == '&' || p == '\'' ||
            p == '*' || p == '+'  ||  p == '-' || p == '.'  ||  p == '^' || p == '_'  ||
            p == '|' || p == '~'  ||  p == '/';

}

enum __tokenizer_result {
    __TOKENIZER_RESULT_COMMA,
    __TOKENIZER_RESULT_EQ,
    __TOKENIZER_RESULT_SEMICOLON,
    __TOKENIZER_RESULT_ILSEQ,
    __TOKENIZER_RESULT_EOS
};

static inline enum __tokenizer_result __tokenizer_res_from_char(const char p)
{
    switch (p) {
        case 0:
            return __TOKENIZER_RESULT_EOS;
        break;
        case ',':
            return __TOKENIZER_RESULT_COMMA;
        break;
        case '=':
            return __TOKENIZER_RESULT_EQ;
        break;
        case ';':
            return __TOKENIZER_RESULT_SEMICOLON;
        break;
        default:
            return __TOKENIZER_RESULT_ILSEQ;
        break;
    }
}

static enum __tokenizer_result __tokenizer_str(char **out, char **in)
{
    char *p, *o;
    char c;

    __skip_space(in);

    p = *in;
    if (*p != '"')
        return __TOKENIZER_RESULT_ILSEQ;

    p++;
    o = p;

    for (; (c = *p); p++) {
1050
        if (c == '\t' || c == ' ' || c == 0x21 || (c >= 0x23 && c <= 0x5B) || (c >= 0x5D && c <= 0x7E) || ((unsigned char)c >= 0x80)) {
1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250
            *(o++) = c;
        } else if (c == '\\') {
            p++;
            c = *p;
            if (c == 0) {
                return __TOKENIZER_RESULT_ILSEQ;
            } else {
                *(o++) = c;
            }
        } else if (c == '"') {
            *o = 0;
            break;
        } else {
            return __TOKENIZER_RESULT_ILSEQ;
        }
    }

    if (*p == '"') {
        p++;
        *in = p + 1;
        __skip_space(in);
        return __tokenizer_res_from_char(*p);
    } else {
        return __TOKENIZER_RESULT_ILSEQ;
    }
}

static enum __tokenizer_result __tokenizer(char **out, char **in)
{
    char *p;
    char c = 0;

    __skip_space(in);

    p = *in;

    switch (*p) {
        case '=':
        /* fall through */
        case ',':
        /* fall through */
        case ';':
            return __TOKENIZER_RESULT_ILSEQ;
        break;
        case 0:
            return __TOKENIZER_RESULT_EOS;
        break;
        case '"':
            return __tokenizer_str(out, in);
        break;
    }

    *out = p;
    for (; __is_token(*p); p++);

    *in = p;
    if (*p) {
        __skip_space(in);
        c = **in;
        if (c != 0) {
            (*in)++;
        }
    }
    *p = 0;

    return __tokenizer_res_from_char(c);
}

#define HTTP_CN_INDEX_INCREMENT     8
#define HTTP_CN_KV_INCREMENT        8

static inline int __resize_array(void **also_ptr, void **array, size_t size, size_t *len, size_t revlen, size_t inc)
{
    void *n;

    if (*len > revlen)
        return 0;

    n = realloc(*array, size*(*len + inc));
    if (!n) {
        return -1;
    }

    memset(n + size * *len, 0, size * inc);

    *also_ptr = *array = n;
    *len += inc;

    return 0;
}

icecast_kva_t * util_parse_http_cn(const char *cnstr)
{
    icecast_kva_t *ret;
    char *in;
    int eos = 0;
    size_t indexphylen = HTTP_CN_INDEX_INCREMENT;
    size_t kvphylen = HTTP_CN_KV_INCREMENT;

    if (!cnstr || !*cnstr)
        return NULL;

    ret = calloc(1, sizeof(*ret));

    if (!ret)
        return NULL;

    ret->_tofree[0] = in = strdup(cnstr);
    ret->_tofree[1] = ret->index = calloc(HTTP_CN_INDEX_INCREMENT, sizeof(*(ret->index)));
    ret->_tofree[2] = ret->kv = calloc(HTTP_CN_KV_INCREMENT, sizeof(*(ret->kv)));
    if (!ret->_tofree[0] || !ret->_tofree[1] || !ret->_tofree[2]) {
        util_kva_free(ret);
        return NULL;
    }


    /* we have at minimum one token */
    ret->indexlen = 1;
    ret->kvlen = 1;

    while (!eos) {
        char *out = NULL;
        enum __tokenizer_result res = __tokenizer(&out, &in);

        switch (res) {
            case __TOKENIZER_RESULT_ILSEQ:
                ICECAST_LOG_DEBUG("Illegal byte sequence error from tokenizer.");
                util_kva_free(ret);
                return NULL;
            break;
            case __TOKENIZER_RESULT_EOS:
            /* fall through */
            case __TOKENIZER_RESULT_COMMA:
            /* fall through */
            case __TOKENIZER_RESULT_EQ:
            /* fall through */
            case __TOKENIZER_RESULT_SEMICOLON:
                ICECAST_LOG_DEBUG("OK from tokenizer.");
                /* no-op */
            break;
        }

        if (__resize_array(&(ret->_tofree[2]), (void**)&(ret->kv), sizeof(*(ret->kv)), &kvphylen, ret->kvlen, HTTP_CN_KV_INCREMENT) == -1 ||
            __resize_array(&(ret->_tofree[1]), (void**)&(ret->index), sizeof(*(ret->index)), &indexphylen, ret->indexlen, HTTP_CN_INDEX_INCREMENT) == -1) {
            util_kva_free(ret);
            return NULL;
        }

        if (ret->kv[ret->kvlen-1].key == NULL) {
            ret->kv[ret->kvlen-1].key = out;
        } else if (ret->kv[ret->kvlen-1].value == NULL) {
            ret->kv[ret->kvlen-1].value = out;
        } else {
            util_kva_free(ret);
            return NULL;
        }

        switch (res) {
            case __TOKENIZER_RESULT_EOS:
                ICECAST_LOG_DEBUG("End of string from tokenizer.");
                eos = 1;
                continue;
            break;
            case __TOKENIZER_RESULT_COMMA:
                ICECAST_LOG_DEBUG("Comma from tokenizer.");
                ret->index[ret->indexlen++] = ret->kvlen;
                ret->kvlen++;
            break;
            case __TOKENIZER_RESULT_EQ:
                ICECAST_LOG_DEBUG("Eq from tokenizer.");
                /* no-op */
            break;
            case __TOKENIZER_RESULT_SEMICOLON:
                ICECAST_LOG_DEBUG("Semicolon from tokenizer.");
                ret->kvlen++;
            break;
            default:
                util_kva_free(ret);
                return NULL;
            break;
        }

        ICECAST_LOG_DEBUG("next...");
    }

    return ret;
}

void util_kva_free(icecast_kva_t *kva)
{
    size_t i;

    if (!kva)
        return;

    for (i = 0; i < (sizeof(kva->_tofree)/sizeof(*(kva->_tofree))); i++)
        free(kva->_tofree[i]);

    free(kva);
}
1251

1252 1253
util_dict *util_dict_new(void)
{
1254
    return (util_dict *)calloc(1, sizeof(util_dict));
1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275
}

void util_dict_free(util_dict *dict)
{
    util_dict *next;

    while (dict) {
        next = dict->next;

        if (dict->key)
            free (dict->key);
        if (dict->val)
            free (dict->val);
        free (dict);

        dict = next;
    }
}

const char *util_dict_get(util_dict *dict, const char *key)
{
1276
    while (dict) {
1277
        if (dict->key && !strcmp(key, dict->key))
1278 1279 1280
            return dict->val;
        dict = dict->next;
    }
Michael Smith's avatar
Michael Smith committed
1281
    return NULL;
1282 1283 1284 1285
}

int util_dict_set(util_dict *dict, const char *key, const char *val)
{
1286
    util_dict *prev;
1287

1288
    if (!dict || !key) {
1289
        ICECAST_LOG_ERROR("NULL values passed to util_dict_set()");
1290 1291 1292
        return 0;
    }

1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303
    prev = NULL;
    while (dict) {
        if (!dict->key || !strcmp(dict->key, key))
            break;
        prev = dict;
        dict = dict->next;
    }

    if (!dict) {
        dict = util_dict_new();
        if (!dict) {
1304
            ICECAST_LOG_ERROR("unable to allocate new dictionary");
1305
            return 0;
1306
        }
1307 1308 1309
        if (prev)
            prev->next = dict;
    }
1310

1311 1312 1313 1314 1315 1316
    if (dict->key)
        free (dict->val);
    else if (!(dict->key = strdup(key))) {
        if (prev)
            prev->next = NULL;
        util_dict_free (dict);
1317

1318
        ICECAST_LOG_ERROR("unable to allocate new dictionary key");
1319
        return 0;
1320
    }
1321

1322 1323
    dict->val = strdup(val);
    if (!dict->val) {
1324
        ICECAST_LOG_ERROR("unable to allocate new dictionary value");
1325
        return 0;
1326
    }
1327

1328
    return 1;
1329 1330
}

1331 1332 1333
/* given a dictionary, URL-encode each val and stringify it in order as
   key=val&key=val... if val is set, or just key&key if val is NULL.
   TODO: Memory management needs overhaul. */
1334 1335
char *util_dict_urlencode(util_dict *dict, char delim)
{
1336 1337 1338 1339 1340 1341 1342 1343 1344
    char *res, *tmp;
    char *enc;
    int start = 1;

    for (res = NULL; dict; dict = dict->next) {
        /* encode key */
        if (!dict->key)
            continue;
        if (start) {
1345
            if (!(res = malloc(strlen(dict->key) + 1))) {
1346 1347
                return NULL;
            }
1348
            sprintf(res, "%s", dict->key);
1349 1350
            start = 0;
        } else {
1351
            if (!(tmp = realloc(res, strlen(res) + strlen(dict->key) + 2))) {
1352 1353 1354 1355
                free(res);
                return NULL;
            } else
                res = tmp;
1356
            sprintf(res + strlen(res), "%c%s", delim, dict->key);
1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377
        }

        /* encode value */
        if (!dict->val)
            continue;
        if (!(enc = util_url_escape(dict->val))) {
            free(res);
            return NULL;
        }

        if (!(tmp = realloc(res, strlen(res) + strlen(enc) + 2))) {
            free(enc);
            free(res);
            return NULL;
        } else
            res = tmp;
        sprintf(res + strlen(res), "=%s", enc);
        free(enc);
    }

    return res;
1378
}
Michael Smith's avatar
Michael Smith committed
1379

1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398
#ifndef HAVE_LOCALTIME_R
struct tm *localtime_r (const time_t *timep, struct tm *result)
{
     static mutex_t localtime_lock;
     static int initialised = 0;
     struct tm *tm;

     if (initialised == 0)
     {
         thread_mutex_create (&localtime_lock);
         initialised = 1;
     }
     thread_mutex_lock (&localtime_lock);
     tm = localtime (timep);
     memcpy (result, tm, sizeof (*result));
     thread_mutex_unlock (&localtime_lock);
     return result;
}
#endif
1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420


/* helper function for converting a passed string in one character set to another
 * we use libxml2 for this
 */
char *util_conv_string (const char *string, const char *in_charset, const char *out_charset)
{
    xmlCharEncodingHandlerPtr in, out;
    char *ret = NULL;

    if (string == NULL || in_charset == NULL || out_charset == NULL)
        return NULL;

    in  = xmlFindCharEncodingHandler (in_charset);
    out = xmlFindCharEncodingHandler (out_charset);

    if (in && out)
    {
        xmlBufferPtr orig = xmlBufferCreate ();
        xmlBufferPtr utf8 = xmlBufferCreate ();
        xmlBufferPtr conv = xmlBufferCreate ();

1421
        ICECAST_LOG_INFO("converting metadata from %s to %s", in_charset, out_charset);
1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438
        xmlBufferCCat (orig, string);
        if (xmlCharEncInFunc (in, utf8, orig) > 0)
        {
            xmlCharEncOutFunc (out, conv, NULL);
            if (xmlCharEncOutFunc (out, conv, utf8) >= 0)
                ret = strdup ((const char *)xmlBufferContent (conv));
        }
        xmlBufferFree (orig);
        xmlBufferFree (utf8);
        xmlBufferFree (conv);
    }
    xmlCharEncCloseFunc (in);
    xmlCharEncCloseFunc (out);

    return ret;
}

1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452

int get_line(FILE *file, char *buf, size_t siz)
{
    if(fgets(buf, (int)siz, file)) {
        size_t len = strlen(buf);
        if(len > 0 && buf[len-1] == '\n') {
            buf[--len] = 0;
            if(len > 0 && buf[len-1] == '\r')
                buf[--len] = 0;
        }
        return 1;
    }
    return 0;
}
1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473

int replace_string(char **dst, const char *src)
{
    char *n;

    if (!dst)
        return -1;

    if (src) {
        n = strdup(src);
        if (!n)
            return -1;
    } else {
        n = NULL;
    }

    free(*dst);
    *dst = n;

    return 0;
}
1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484

int util_strtolower(char *str)
{
    if (!str)
        return -1;

    for (; *str; str++)
        *str = tolower(*str);

    return 0;
}