mirror of https://code.videolan.org/videolan/vlc
188 lines
5.1 KiB
C
188 lines
5.1 KiB
C
/*****************************************************************************
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* sdp.c : SDP creation helpers
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*****************************************************************************
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* Copyright © 2007 Rémi Denis-Courmont
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <string.h>
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#include <vlc_common.h>
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#include <vlc_tick.h>
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#include <vlc_network.h>
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#include <vlc_charset.h>
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#include <vlc_memstream.h>
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#include "sdp_helper.h"
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#define MAXSDPADDRESS 47
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static
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char *AddressToSDP (const struct sockaddr *addr, size_t addrlen, char *buf)
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{
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if (addrlen < offsetof (struct sockaddr, sa_family)
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+ sizeof (addr->sa_family))
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return NULL;
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strcpy (buf, "IN IP* ");
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if (vlc_getnameinfo (addr, addrlen, buf + 7, MAXSDPADDRESS - 7, NULL,
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NI_NUMERICHOST))
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return NULL;
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switch (addr->sa_family)
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{
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case AF_INET:
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{
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if (net_SockAddrIsMulticast (addr, addrlen))
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strcat (buf, "/255"); // obsolete in RFC4566, dummy value
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buf[5] = '4';
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break;
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}
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#ifdef AF_INET6
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case AF_INET6:
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{
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char *ptr = strchr (buf, '%');
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if (ptr != NULL)
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*ptr = '\0'; // remove scope ID
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buf[5] = '6';
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break;
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}
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#endif
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default:
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return NULL;
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}
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return buf;
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}
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static bool IsSDPString (const char *str)
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{
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if (strchr (str, '\r') != NULL)
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return false;
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if (strchr (str, '\n') != NULL)
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return false;
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if (!IsUTF8 (str))
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return false;
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return true;
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}
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int vlc_sdp_Start(struct vlc_memstream *restrict stream,
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vlc_object_t *obj, const char *cfgpref,
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const struct sockaddr *src, size_t srclen,
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const struct sockaddr *addr, size_t addrlen)
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{
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char connection[MAXSDPADDRESS];
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char *str = NULL;
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size_t cfglen = strlen(cfgpref);
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if (cfglen >= 128)
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return -1;
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char varname[cfglen + sizeof ("description")];
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char *subvar = varname + cfglen;
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strcpy(varname, cfgpref);
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vlc_memstream_open(stream);
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vlc_memstream_puts(stream, "v=0\r\n");
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if (AddressToSDP(addr, addrlen, connection) == NULL)
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goto error;
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{
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const uint_fast64_t now = vlc_ntp_time();
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char hostname[256];
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gethostname(hostname, sizeof (hostname));
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vlc_memstream_printf(stream, "o=- %"PRIu64" %"PRIu64" IN IP%c %s\r\n",
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now, now, connection[5], hostname);
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}
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strcpy(subvar, "name");
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str = var_GetNonEmptyString(obj, varname);
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if (str != NULL)
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{
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if (!IsSDPString(str))
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goto error;
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vlc_memstream_printf(stream, "s=%s\r\n", str);
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free(str);
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}
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else
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vlc_memstream_printf(stream, "s=%s\r\n", "Unnamed");
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strcpy(subvar, "description");
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str = var_GetNonEmptyString(obj, varname);
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if (str != NULL)
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{
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if (!IsSDPString(str))
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goto error;
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vlc_memstream_printf(stream, "i=%s\r\n", str);
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free(str);
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}
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// no URL, email, no phone (useless)
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vlc_memstream_printf(stream, "c=%s\r\n", connection);
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// bandwidth not specified
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vlc_memstream_puts(stream, "t=0 0\r\n"); // one dummy time span
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// no repeating
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// no time zone adjustment (silly idea anyway)
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// no encryption key (deprecated)
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vlc_memstream_printf(stream, "a=tool:%s\r\n", PACKAGE_STRING);
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vlc_memstream_puts(stream, "a=recvonly\r\n");
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vlc_memstream_puts(stream, "a=type:broadcast\r\n");
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vlc_memstream_puts(stream, "a=charset:UTF-8\r\n");
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if (srclen > 0)
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{
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char machine[MAXSDPADDRESS];
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if (AddressToSDP(src, srclen, machine) != NULL)
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vlc_memstream_printf(stream,
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"a=source-filter: incl IN IP%c * %s\r\n",
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machine[5], machine + 7);
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}
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strcpy(subvar, "cat");
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str = var_GetNonEmptyString(obj, varname);
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if (str != NULL)
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{
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if (IsSDPString(str))
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goto error;
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vlc_memstream_printf(stream, "a=cat:%s\r\n", str);
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vlc_memstream_printf(stream, "a=x-plgroup:%s\r\n", str);
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free(str);
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}
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return 0;
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error:
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free(str);
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if (vlc_memstream_close(stream) == 0)
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free(stream->ptr);
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return -1;
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}
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