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/***
This file is part of PulseAudio.
Copyright 2006 Lennart Poettering
PulseAudio is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation; either version 2.1 of the License,
or (at your option) any later version.
PulseAudio is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <sys/ioctl.h>
#ifdef HAVE_SYS_FILIO_H
#include <sys/filio.h>
#endif
#ifdef HAVE_SYS_UIO_H
#include <sys/uio.h>
#endif
#include <pulse/xmalloc.h>
#include <pulsecore/core-error.h>
#include <pulsecore/core-util.h>
#include <pulsecore/log.h>
#include <pulsecore/macro.h>
#include <pulsecore/arpa-inet.h>
#include "sap.h"
#include "sdp.h"
#define MIME_TYPE "application/sdp"
pa_sap_context* pa_sap_context_init_send(pa_sap_context *c, int fd, char *sdp_data) {
pa_assert(c);
pa_assert(fd >= 0);
pa_assert(sdp_data);
c->fd = fd;
c->sdp_data = sdp_data;
c->msg_id_hash = (uint16_t) (rand()*rand());
return c;
}
void pa_sap_context_destroy(pa_sap_context *c) {
pa_assert(c);
pa_close(c->fd);
pa_xfree(c->sdp_data);
}
int pa_sap_send(pa_sap_context *c, bool goodbye) {
uint32_t header;
struct sockaddr_storage sa_buf;
struct sockaddr *sa = (struct sockaddr*) &sa_buf;
socklen_t salen = sizeof(sa_buf);
struct iovec iov[4];
struct msghdr m;
ssize_t k;
if (getsockname(c->fd, sa, &salen) < 0) {
pa_log("getsockname() failed: %s\n", pa_cstrerror(errno));
return -1;
}
#ifdef HAVE_IPV6
pa_assert(sa->sa_family == AF_INET || sa->sa_family == AF_INET6);
#else
pa_assert(sa->sa_family == AF_INET);
#endif
header = htonl(((uint32_t) 1 << 29) |
#ifdef HAVE_IPV6
(sa->sa_family == AF_INET6 ? (uint32_t) 1 << 28 : 0) |
#endif
(goodbye ? (uint32_t) 1 << 26 : 0) |
(c->msg_id_hash));
iov[0].iov_base = &header;
iov[0].iov_len = sizeof(header);
if (sa->sa_family == AF_INET) {
iov[1].iov_base = (void*) &((struct sockaddr_in*) sa)->sin_addr;
iov[1].iov_len = 4U;
#ifdef HAVE_IPV6
} else {
iov[1].iov_base = (void*) &((struct sockaddr_in6*) sa)->sin6_addr;
iov[1].iov_len = 16U;
#endif
}
iov[2].iov_base = (char*) MIME_TYPE;
iov[2].iov_len = sizeof(MIME_TYPE);
iov[3].iov_base = c->sdp_data;
iov[3].iov_len = strlen(c->sdp_data);
m.msg_name = NULL;
m.msg_namelen = 0;
m.msg_iov = iov;
m.msg_iovlen = 4;
m.msg_control = NULL;
m.msg_controllen = 0;
m.msg_flags = 0;
if ((k = sendmsg(c->fd, &m, MSG_DONTWAIT)) < 0)
pa_log_warn("sendmsg() failed: %s\n", pa_cstrerror(errno));
return (int) k;
}
pa_sap_context* pa_sap_context_init_recv(pa_sap_context *c, int fd) {
pa_assert(c);
pa_assert(fd >= 0);
c->fd = fd;
c->sdp_data = NULL;
return c;
}
int pa_sap_recv(pa_sap_context *c, bool *goodbye) {
struct msghdr m;
struct iovec iov;
int size;
char *buf = NULL, *e;
uint32_t header;
unsigned six, ac, k;
ssize_t r;
pa_assert(c);
pa_assert(goodbye);
if (ioctl(c->fd, FIONREAD, &size) < 0) {
pa_log_warn("FIONREAD failed: %s", pa_cstrerror(errno));
goto fail;
}
buf = pa_xnew(char, (unsigned) size+1);
buf[size] = 0;
iov.iov_base = buf;
iov.iov_len = (size_t) size;
m.msg_name = NULL;
m.msg_namelen = 0;
m.msg_iov = &iov;
m.msg_iovlen = 1;
m.msg_control = NULL;
m.msg_controllen = 0;
m.msg_flags = 0;
if ((r = recvmsg(c->fd, &m, 0)) != size) {
pa_log_warn("recvmsg() failed: %s", r < 0 ? pa_cstrerror(errno) : "size mismatch");
goto fail;
}
if (size < 4) {
pa_log_warn("SAP packet too short.");
goto fail;
}
memcpy(&header, buf, sizeof(uint32_t));
header = ntohl(header);
if (header >> 29 != 1) {
pa_log_warn("Unsupported SAP version.");
goto fail;
}
if ((header >> 25) & 1) {
pa_log_warn("Encrypted SAP not supported.");
goto fail;
}
if ((header >> 24) & 1) {
pa_log_warn("Compressed SAP not supported.");
goto fail;
}
six = (header >> 28) & 1U;
ac = (header >> 16) & 0xFFU;
k = 4 + (six ? 16U : 4U) + ac*4U;
if ((unsigned) size < k) {
pa_log_warn("SAP packet too short (AD).");
goto fail;
}
e = buf + k;
size -= (int) k;
if ((unsigned) size >= sizeof(MIME_TYPE) && pa_streq(e, MIME_TYPE)) {
e += sizeof(MIME_TYPE);
size -= (int) sizeof(MIME_TYPE);
} else if ((unsigned) size < sizeof(PA_SDP_HEADER)-1 || strncmp(e, PA_SDP_HEADER, sizeof(PA_SDP_HEADER)-1)) {
pa_log_warn("Invalid SDP header.");
goto fail;
}
if (c->sdp_data)
pa_xfree(c->sdp_data);
c->sdp_data = pa_xstrndup(e, (unsigned) size);
pa_xfree(buf);
*goodbye = !!((header >> 26) & 1);
return 0;
fail:
pa_xfree(buf);
return -1;
}
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