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owntone-server/src/evrtsp/rtsp.c

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/*
* Copyright (C) 2010 Julien BLACHE <jb@jblache.org>
* Based on evhttp from libevent 1.4.x
*
* Copyright (c) 2002-2006 Niels Provos <provos@citi.umich.edu>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/param.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/queue.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <signal.h>
#include <time.h>
#include <unistd.h>
#include <fcntl.h>
#include <event2/event-config.h>
#undef timeout_pending
#undef timeout_initialized
#include "evrtsp.h"
/* #define USE_DEBUG */
#include "log.h"
#include "rtsp-internal.h"
#ifndef EVENT__HAVE_GETNAMEINFO
#define NI_MAXSERV 32
#define NI_MAXHOST 1025
#define NI_NUMERICHOST 1
#define NI_NUMERICSERV 2
static int
fake_getnameinfo(const struct sockaddr *sa, size_t salen, char *host,
size_t hostlen, char *serv, size_t servlen, int flags)
{
struct sockaddr_in *sin = (struct sockaddr_in *)sa;
int ret;
if (serv != NULL) {
char tmpserv[16];
evutil_snprintf(tmpserv, sizeof(tmpserv),
"%d", ntohs(sin->sin_port));
ret = evutil_snprintf(serv, servlen, "%s", tmpserv);
if ((ret < 0) || (ret >= servlen))
return (-1);
}
if (host != NULL) {
if (flags & NI_NUMERICHOST) {
ret = evutil_snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
if ((ret < 0) || (ret >= hostlen))
return (-1);
else
return (0);
} else {
struct hostent *hp;
hp = gethostbyaddr((char *)&sin->sin_addr,
sizeof(struct in_addr), AF_INET);
if (hp == NULL)
return (-2);
ret = evutil_snprintf(host, hostlen, "%s", hp->h_name);
if ((ret < 0) || (ret >= hostlen))
return (-1);
else
return (0);
}
}
return (0);
}
#endif
#ifndef EVENT__HAVE_GETADDRINFO
struct addrinfo {
int ai_family;
int ai_socktype;
int ai_protocol;
size_t ai_addrlen;
struct sockaddr *ai_addr;
struct addrinfo *ai_next;
};
static int
fake_getaddrinfo(const char *hostname, struct addrinfo *ai)
{
struct hostent *he = NULL;
struct sockaddr_in *sa;
if (hostname) {
he = gethostbyname(hostname);
if (!he)
return (-1);
}
ai->ai_family = he ? he->h_addrtype : AF_INET;
ai->ai_socktype = SOCK_STREAM;
ai->ai_protocol = 0;
ai->ai_addrlen = sizeof(struct sockaddr_in);
if (NULL == (ai->ai_addr = malloc(ai->ai_addrlen)))
return (-1);
sa = (struct sockaddr_in*)ai->ai_addr;
memset(sa, 0, ai->ai_addrlen);
if (he) {
sa->sin_family = he->h_addrtype;
memcpy(&sa->sin_addr, he->h_addr_list[0], he->h_length);
} else {
sa->sin_family = AF_INET;
sa->sin_addr.s_addr = INADDR_ANY;
}
ai->ai_next = NULL;
return (0);
}
static void
fake_freeaddrinfo(struct addrinfo *ai)
{
free(ai->ai_addr);
}
#endif
#ifndef MIN
#define MIN(a,b) (((a)<(b))?(a):(b))
#endif
/* wrapper for setting the base from the rtsp server */
#define EVRTSP_BASE_SET(x, y) do { \
if ((x)->base != NULL) event_base_set((x)->base, y); \
} while (0)
extern int debug;
static int socket_connect(int fd, const char *address, unsigned short port);
static int bind_socket_ai(int family, struct addrinfo *, int reuse);
static int bind_socket(int family, const char *, u_short, int reuse);
static void name_from_addr(struct sockaddr *, socklen_t, char **, char **);
static void evrtsp_connection_start_detectclose(
struct evrtsp_connection *evcon);
static void evrtsp_connection_stop_detectclose(
struct evrtsp_connection *evcon);
static void evrtsp_request_dispatch(struct evrtsp_connection* evcon);
static void evrtsp_read_firstline(struct evrtsp_connection *evcon,
struct evrtsp_request *req);
static void evrtsp_read_header(struct evrtsp_connection *evcon,
struct evrtsp_request *req);
static int evrtsp_add_header_internal(struct evkeyvalq *headers,
const char *key, const char *value);
void evrtsp_read(int, short, void *);
void evrtsp_write(int, short, void *);
#ifndef EVENT__HAVE_STRSEP
/* strsep replacement for platforms that lack it. Only works if
* del is one character long. */
static char *
strsep(char **s, const char *del)
{
char *d, *tok;
assert(strlen(del) == 1);
if (!s || !*s)
return NULL;
tok = *s;
d = strstr(tok, del);
if (d) {
*d = '\0';
*s = d + 1;
} else
*s = NULL;
return tok;
}
#endif
const char *
evrtsp_method(enum evrtsp_cmd_type type)
{
const char *method;
switch (type) {
case EVRTSP_REQ_ANNOUNCE:
method = "ANNOUNCE";
break;
case EVRTSP_REQ_OPTIONS:
method = "OPTIONS";
break;
case EVRTSP_REQ_SETUP:
method = "SETUP";
break;
case EVRTSP_REQ_RECORD:
method = "RECORD";
break;
case EVRTSP_REQ_PAUSE:
method = "PAUSE";
break;
case EVRTSP_REQ_GET_PARAMETER:
method = "GET_PARAMETER";
break;
case EVRTSP_REQ_SET_PARAMETER:
method = "SET_PARAMETER";
break;
case EVRTSP_REQ_FLUSH:
method = "FLUSH";
break;
case EVRTSP_REQ_TEARDOWN:
method = "TEARDOWN";
break;
case EVRTSP_REQ_POST:
method = "POST";
break;
case EVRTSP_REQ_GET:
method = "GET";
break;
case EVRTSP_REQ_SETPEERS:
method = "SETPEERS";
break;
default:
method = NULL;
break;
}
return (method);
}
static void
evrtsp_add_event(struct event *ev, int timeout, int default_timeout)
{
if (timeout != 0) {
struct timeval tv;
evutil_timerclear(&tv);
tv.tv_sec = timeout != -1 ? timeout : default_timeout;
event_add(ev, &tv);
} else {
event_add(ev, NULL);
}
}
void
evrtsp_write_buffer(struct evrtsp_connection *evcon,
void (*cb)(struct evrtsp_connection *, void *), void *arg)
{
event_debug(("%s: preparing to write buffer", __func__));
/* Set call back */
evcon->cb = cb;
evcon->cb_arg = arg;
/* check if the event is already pending */
if (event_pending(&evcon->ev, EV_WRITE|EV_TIMEOUT, NULL))
event_del(&evcon->ev);
event_assign(&evcon->ev, evcon->base, evcon->fd, EV_WRITE, evrtsp_write, evcon);
evrtsp_add_event(&evcon->ev, evcon->timeout, RTSP_WRITE_TIMEOUT);
}
static int
evrtsp_connected(struct evrtsp_connection *evcon)
{
switch (evcon->state) {
case EVCON_DISCONNECTED:
case EVCON_CONNECTING:
return (0);
case EVCON_IDLE:
case EVCON_READING_FIRSTLINE:
case EVCON_READING_HEADERS:
case EVCON_READING_BODY:
case EVCON_READING_TRAILER:
case EVCON_WRITING:
default:
return (1);
}
}
/*
* Create the headers needed for an RTSP request
*/
static void
evrtsp_make_header_request(struct evrtsp_connection *evcon,
struct evrtsp_request *req)
{
const char *method;
/* Generate request line */
method = evrtsp_method(req->type);
evbuffer_add_printf(evcon->output_buffer, "%s %s RTSP/%d.%d\r\n",
method, req->uri, req->major, req->minor);
/* Content-Length is mandatory, absent means 0 */
if ((evbuffer_get_length(req->output_buffer) > 0)
&& (evrtsp_find_header(req->output_headers, "Content-Length") == NULL))
{
char size[12];
evutil_snprintf(size, sizeof(size), "%ld",
(long)evbuffer_get_length(req->output_buffer));
evrtsp_add_header(req->output_headers, "Content-Length", size);
}
}
void
evrtsp_make_header(struct evrtsp_connection *evcon, struct evrtsp_request *req)
{
struct evkeyval *header;
evrtsp_make_header_request(evcon, req);
TAILQ_FOREACH(header, req->output_headers, next) {
evbuffer_add_printf(evcon->output_buffer, "%s: %s\r\n",
header->key, header->value);
}
evbuffer_add(evcon->output_buffer, "\r\n", 2);
if (evbuffer_get_length(req->output_buffer) > 0) {
evbuffer_add_buffer(evcon->output_buffer, req->output_buffer);
}
}
/* Separated host, port and file from URI */
int /* FIXME: needed? */
evrtsp_hostportfile(char *url, char **phost, u_short *pport, char **pfile)
{
/* XXX not threadsafe. */
static char host[1024];
static char file[1024];
char *p;
const char *p2;
int len;
int ret;
u_short port;
len = strlen(RTSP_PREFIX);
if (strncasecmp(url, RTSP_PREFIX, len))
return (-1);
url += len;
/* We might overrun */
ret = evutil_snprintf(host, sizeof(host), "%s", url);
if ((ret < 0) || (ret >= sizeof(host)))
return (-1);
p = strchr(host, '/');
if (p != NULL) {
*p = '\0';
p2 = p + 1;
} else
p2 = NULL;
if (pfile != NULL) {
/* Generate request file */
if (p2 == NULL)
p2 = "";
evutil_snprintf(file, sizeof(file), "/%s", p2);
}
p = strchr(host, ':');
if (p != NULL) {
*p = '\0';
port = atoi(p + 1);
if (port == 0)
return (-1);
} else
return -1;
if (phost != NULL)
*phost = host;
if (pport != NULL)
*pport = port;
if (pfile != NULL)
*pfile = file;
return (0);
}
void
evrtsp_connection_fail(struct evrtsp_connection *evcon,
enum evrtsp_connection_error error)
{
struct evrtsp_request* req = TAILQ_FIRST(&evcon->requests);
void (*cb)(struct evrtsp_request *, void *);
void *cb_arg;
assert(req != NULL);
/* save the callback for later; the cb might free our object */
cb = req->cb;
cb_arg = req->cb_arg;
TAILQ_REMOVE(&evcon->requests, req, next);
evrtsp_request_free(req);
/* xxx: maybe we should fail all requests??? */
/* reset the connection */
evrtsp_connection_reset(evcon);
/* We are trying the next request that was queued on us */
if (TAILQ_FIRST(&evcon->requests) != NULL)
evrtsp_connection_connect(evcon);
/* inform the user */
if (cb != NULL)
(*cb)(NULL, cb_arg);
}
void
evrtsp_write(int fd, short what, void *arg)
{
struct evrtsp_connection *evcon = arg;
int n;
if (what == EV_TIMEOUT) {
event_warn("%s: write timeout", __func__);
evrtsp_connection_fail(evcon, EVCON_RTSP_TIMEOUT);
return;
}
n = evbuffer_write(evcon->output_raw, fd);
if (n == -1) {
event_warn("%s: evbuffer_write", __func__);
evrtsp_connection_fail(evcon, EVCON_RTSP_EOF);
return;
}
if (n == 0) {
event_warn("%s: write nothing", __func__);
evrtsp_connection_fail(evcon, EVCON_RTSP_EOF);
return;
}
if (evbuffer_get_length(evcon->output_raw) != 0) {
evrtsp_add_event(&evcon->ev,
evcon->timeout, RTSP_WRITE_TIMEOUT);
return;
}
/* Activate our call back */
if (evcon->cb != NULL)
(*evcon->cb)(evcon, evcon->cb_arg);
}
/**
* Advance the connection state.
* - If this is an outgoing connection, we've just processed the response;
* idle or close the connection.
*/
static void
evrtsp_connection_done(struct evrtsp_connection *evcon)
{
struct evrtsp_request *req = TAILQ_FIRST(&evcon->requests);
/* idle or close the connection */
TAILQ_REMOVE(&evcon->requests, req, next);
req->evcon = NULL;
evcon->state = EVCON_IDLE;
if (TAILQ_FIRST(&evcon->requests) != NULL) {
/*
* We have more requests; reset the connection
* and deal with the next request.
*/
if (!evrtsp_connected(evcon))
evrtsp_connection_connect(evcon);
else
evrtsp_request_dispatch(evcon);
} else {
/*
* The connection is going to be persistent, but we
* need to detect if the other side closes it.
*/
evrtsp_connection_start_detectclose(evcon);
}
/* notify the user of the request */
(*req->cb)(req, req->cb_arg);
evrtsp_request_free(req);
}
static void /* FIXME: needed? */
evrtsp_read_trailer(struct evrtsp_connection *evcon, struct evrtsp_request *req)
{
struct evbuffer *buf = evcon->input_buffer;
switch (evrtsp_parse_headers(req, buf)) {
case DATA_CORRUPTED:
event_warn("%s: invalid header", __func__);
evrtsp_connection_fail(evcon, EVCON_RTSP_INVALID_HEADER);
break;
case ALL_DATA_READ:
event_del(&evcon->ev);
evrtsp_connection_done(evcon);
break;
case MORE_DATA_EXPECTED:
default:
evrtsp_add_event(&evcon->ev, evcon->timeout,
RTSP_READ_TIMEOUT);
break;
}
}
static void
evrtsp_read_body(struct evrtsp_connection *evcon, struct evrtsp_request *req)
{
struct evbuffer *buf = evcon->input_buffer;
if (req->ntoread < 0) {
/* Read until connection close. */
evbuffer_add_buffer(req->input_buffer, buf);
} else if (evbuffer_get_length(buf) >= req->ntoread) {
/* Completed content length */
evbuffer_add(req->input_buffer, evbuffer_pullup(buf,-1),
(size_t)req->ntoread);
evbuffer_drain(buf, (size_t)req->ntoread);
req->ntoread = 0;
evrtsp_connection_done(evcon);
return;
}
/* Read more! */
event_assign(&evcon->ev, evcon->base, evcon->fd, EV_READ, evrtsp_read, evcon);
evrtsp_add_event(&evcon->ev, evcon->timeout, RTSP_READ_TIMEOUT);
}
static void
evrtsp_read_message(struct evrtsp_connection *evcon, struct evrtsp_request *req)
{
switch (evcon->state) {
case EVCON_READING_FIRSTLINE:
evrtsp_read_firstline(evcon, req);
break;
case EVCON_READING_HEADERS:
evrtsp_read_header(evcon, req);
break;
case EVCON_READING_BODY:
evrtsp_read_body(evcon, req);
break;
case EVCON_READING_TRAILER:
evrtsp_read_trailer(evcon, req);
break;
case EVCON_DISCONNECTED:
case EVCON_CONNECTING:
case EVCON_IDLE:
case EVCON_WRITING:
default:
event_errx(1, "%s: illegal connection state %d",
__func__, evcon->state);
}
}
/*
* Reads data into a buffer structure until no more data
* can be read on the file descriptor or we have read all
* the data that we wanted to read.
* Execute callback when done.
*/
void
evrtsp_read(int fd, short what, void *arg)
{
struct evrtsp_connection *evcon = arg;
struct evrtsp_request *req = TAILQ_FIRST(&evcon->requests);
int ret;
int n;
if (what == EV_TIMEOUT) {
event_warn("%s: read timeout", __func__);
evrtsp_connection_fail(evcon, EVCON_RTSP_TIMEOUT);
return;
}
n = evbuffer_read(evcon->input_raw, fd, -1);
event_debug(("%s: got %d on %d", __func__, n, fd));
if (n == -1) {
if (errno != EINTR && errno != EAGAIN) {
event_warn("%s: evbuffer_read", __func__);
evrtsp_connection_fail(evcon, EVCON_RTSP_EOF);
} else {
evrtsp_add_event(&evcon->ev, evcon->timeout,
RTSP_READ_TIMEOUT);
}
return;
} else if (n == 0) {
/* Connection closed */
evcon->state = EVCON_DISCONNECTED;
evrtsp_connection_done(evcon);
return;
}
if (!evcon->ciphercb) {
evbuffer_add_buffer(evcon->input_buffer, evcon->input_raw);
} else {
// May get an incomplete ciphered messages, in which case
// input_buffer will be filled with only the part that could be
// decrypted, and the callback will drain input_raw so that only
// any remaining undecryptable seqment is left. Next read should
// then add what is missing.
ret = evcon->ciphercb(evcon->input_buffer, evcon->input_raw, evcon->ciphercb_arg, 0);
if (ret < 0) {
event_warn("%s: evbuffer_read", __func__);
evrtsp_connection_fail(evcon, EVCON_RTSP_EOF);
return;
}
}
evrtsp_read_message(evcon, req);
}
static void
evrtsp_write_connectioncb(struct evrtsp_connection *evcon, void *arg)
{
/* This is after writing the request to the server */
struct evrtsp_request *req = TAILQ_FIRST(&evcon->requests);
assert(req != NULL);
assert(evcon->state == EVCON_WRITING);
/* We are done writing our header and are now expecting the response */
req->kind = EVRTSP_RESPONSE;
evrtsp_start_read(evcon);
}
/*
* Clean up a connection object
*/
void
evrtsp_connection_free(struct evrtsp_connection *evcon)
{
struct evrtsp_request *req;
/* notify interested parties that this connection is going down */
if (evcon->fd != -1) {
if (evrtsp_connected(evcon) && evcon->closecb != NULL)
(*evcon->closecb)(evcon, evcon->closecb_arg);
}
/* remove all requests that might be queued on this connection */
while ((req = TAILQ_FIRST(&evcon->requests)) != NULL) {
TAILQ_REMOVE(&evcon->requests, req, next);
evrtsp_request_free(req);
}
if (event_initialized(&evcon->close_ev))
event_del(&evcon->close_ev);
if (event_initialized(&evcon->ev))
event_del(&evcon->ev);
if (evcon->fd != -1)
EVUTIL_CLOSESOCKET(evcon->fd);
if (evcon->bind_address != NULL)
free(evcon->bind_address);
if (evcon->address != NULL)
free(evcon->address);
if (evcon->input_buffer != NULL)
evbuffer_free(evcon->input_buffer);
if (evcon->output_buffer != NULL)
evbuffer_free(evcon->output_buffer);
if (evcon->input_raw != NULL)
evbuffer_free(evcon->input_raw);
if (evcon->output_raw != NULL)
evbuffer_free(evcon->output_raw);
free(evcon);
}
static void
evrtsp_request_dispatch(struct evrtsp_connection* evcon)
{
struct evrtsp_request *req = TAILQ_FIRST(&evcon->requests);
/* this should not usually happy but it's possible */
if (req == NULL)
return;
/* delete possible close detection events */
evrtsp_connection_stop_detectclose(evcon);
/* we assume that the connection is connected already */
assert(evcon->state == EVCON_IDLE);
evcon->state = EVCON_WRITING;
/* Create the header from the store arguments */
evrtsp_make_header(evcon, req);
/* owntone customisation for encryption */
if (!evcon->ciphercb)
evbuffer_add_buffer(evcon->output_raw, evcon->output_buffer);
else
evcon->ciphercb(evcon->output_raw, evcon->output_buffer, evcon->ciphercb_arg, 1);
evrtsp_write_buffer(evcon, evrtsp_write_connectioncb, NULL);
}
/* Reset our connection state */
void
evrtsp_connection_reset(struct evrtsp_connection *evcon)
{
if (event_initialized(&evcon->ev))
event_del(&evcon->ev);
if (evcon->fd != -1) {
/* inform interested parties about connection close */
if (evrtsp_connected(evcon) && evcon->closecb != NULL)
(*evcon->closecb)(evcon, evcon->closecb_arg);
EVUTIL_CLOSESOCKET(evcon->fd);
evcon->fd = -1;
}
evcon->state = EVCON_DISCONNECTED;
evbuffer_drain(evcon->input_buffer,
evbuffer_get_length(evcon->input_buffer));
evbuffer_drain(evcon->output_buffer,
evbuffer_get_length(evcon->output_buffer));
evbuffer_drain(evcon->input_raw,
evbuffer_get_length(evcon->input_raw));
evbuffer_drain(evcon->output_raw,
evbuffer_get_length(evcon->output_raw));
}
static void
evrtsp_detect_close_cb(int fd, short what, void *arg)
{
struct evrtsp_connection *evcon = arg;
evrtsp_connection_reset(evcon);
}
static void
evrtsp_connection_start_detectclose(struct evrtsp_connection *evcon)
{
evcon->flags |= EVRTSP_CON_CLOSEDETECT;
if (event_initialized(&evcon->close_ev))
event_del(&evcon->close_ev);
event_assign(&evcon->close_ev, evcon->base, evcon->fd, EV_READ,
evrtsp_detect_close_cb, evcon);
event_add(&evcon->close_ev, NULL);
}
static void
evrtsp_connection_stop_detectclose(struct evrtsp_connection *evcon)
{
evcon->flags &= ~EVRTSP_CON_CLOSEDETECT;
if (event_initialized(&evcon->close_ev))
event_del(&evcon->close_ev);
}
/*
* Call back for asynchronous connection attempt.
*/
static void
evrtsp_connectioncb(int fd, short what, void *arg)
{
struct evrtsp_connection *evcon = arg;
int error;
socklen_t errsz = sizeof(error);
if (what == EV_TIMEOUT) {
event_warnx("%s: connection timeout for \"%s:%d\" on %d",
__func__, evcon->address, evcon->port, evcon->fd);
goto cleanup;
}
/* Check if the connection completed */
if (getsockopt(evcon->fd, SOL_SOCKET, SO_ERROR, (void*)&error,
&errsz) == -1) {
event_warnx("%s: getsockopt for \"%s:%d\" on %d",
__func__, evcon->address, evcon->port, evcon->fd);
goto cleanup;
}
if (error) {
event_warnx("%s: connect failed for \"%s:%d\" on %d: %s",
__func__, evcon->address, evcon->port, evcon->fd,
strerror(error));
goto cleanup;
}
/* We are connected to the server now */
event_debug(("%s: connected to \"%s:%d\" on %d",
__func__, evcon->address, evcon->port, evcon->fd));
evcon->state = EVCON_IDLE;
/* try to start requests that have queued up on this connection */
evrtsp_request_dispatch(evcon);
return;
cleanup:
evrtsp_connection_reset(evcon);
/* for now, we just signal all requests by executing their callbacks */
while (TAILQ_FIRST(&evcon->requests) != NULL) {
struct evrtsp_request *request = TAILQ_FIRST(&evcon->requests);
TAILQ_REMOVE(&evcon->requests, request, next);
request->evcon = NULL;
/* we might want to set an error here */
request->cb(request, request->cb_arg);
evrtsp_request_free(request);
}
}
/*
* Check if we got a valid response code.
*/
static int
evrtsp_valid_response_code(int code)
{
if (code == 0)
return (0);
return (1);
}
/* Parses the status line of an RTSP server */
static int
evrtsp_parse_response_line(struct evrtsp_request *req, char *line)
{
char *protocol;
char *number;
const char *readable = "";
protocol = strsep(&line, " ");
if (line == NULL)
return (-1);
number = strsep(&line, " ");
if (line != NULL)
readable = line;
if (strcmp(protocol, "RTSP/1.0") == 0) {
req->major = 1;
req->minor = 0;
} else if (strcmp(protocol, "RTSP/1.1") == 0) {
req->major = 1;
req->minor = 1;
} else {
event_warnx("%s: bad protocol \"%s\"",
__func__, protocol);
return (-1);
}
req->response_code = atoi(number);
if (!evrtsp_valid_response_code(req->response_code)) {
event_warnx("%s: bad response code \"%s\"",
__func__, number);
return (-1);
}
if ((req->response_code_line = strdup(readable)) == NULL)
event_err(1, "%s: strdup", __func__);
return (0);
}
const char *
evrtsp_find_header(const struct evkeyvalq *headers, const char *key)
{
struct evkeyval *header;
TAILQ_FOREACH(header, headers, next) {
if (strcasecmp(header->key, key) == 0)
return (header->value);
}
return (NULL);
}
void
evrtsp_clear_headers(struct evkeyvalq *headers)
{
struct evkeyval *header;
for (header = TAILQ_FIRST(headers);
header != NULL;
header = TAILQ_FIRST(headers)) {
TAILQ_REMOVE(headers, header, next);
free(header->key);
free(header->value);
free(header);
}
}
/*
* Returns 0, if the header was successfully removed.
* Returns -1, if the header could not be found.
*/
int
evrtsp_remove_header(struct evkeyvalq *headers, const char *key)
{
struct evkeyval *header;
TAILQ_FOREACH(header, headers, next) {
if (strcasecmp(header->key, key) == 0)
break;
}
if (header == NULL)
return (-1);
/* Free and remove the header that we found */
TAILQ_REMOVE(headers, header, next);
free(header->key);
free(header->value);
free(header);
return (0);
}
static int
evrtsp_header_is_valid_value(const char *value)
{
const char *p = value;
while ((p = strpbrk(p, "\r\n")) != NULL) {
/* we really expect only one new line */
p += strspn(p, "\r\n");
/* we expect a space or tab for continuation */
if (*p != ' ' && *p != '\t')
return (0);
}
return (1);
}
int
evrtsp_add_header(struct evkeyvalq *headers,
const char *key, const char *value)
{
event_debug(("%s: key: %s val: %s", __func__, key, value));
if (strchr(key, '\r') != NULL || strchr(key, '\n') != NULL) {
/* drop illegal headers */
event_warn("%s: dropping illegal header key", __func__);
return (-1);
}
if (!evrtsp_header_is_valid_value(value)) {
event_warn("%s: dropping illegal header value", __func__);
return (-1);
}
return (evrtsp_add_header_internal(headers, key, value));
}
static int
evrtsp_add_header_internal(struct evkeyvalq *headers,
const char *key, const char *value)
{
struct evkeyval *header = calloc(1, sizeof(struct evkeyval));
if (header == NULL) {
event_warn("%s: calloc", __func__);
return (-1);
}
if ((header->key = strdup(key)) == NULL) {
free(header);
event_warn("%s: strdup", __func__);
return (-1);
}
if ((header->value = strdup(value)) == NULL) {
free(header->key);
free(header);
event_warn("%s: strdup", __func__);
return (-1);
}
TAILQ_INSERT_TAIL(headers, header, next);
return (0);
}
/*
* Parses header lines from a request or a response into the specified
* request object given an event buffer.
*
* Returns
* DATA_CORRUPTED on error
* MORE_DATA_EXPECTED when we need to read more headers
* ALL_DATA_READ when all headers have been read.
*/
enum message_read_status
evrtsp_parse_firstline(struct evrtsp_request *req, struct evbuffer *buffer)
{
char *line;
enum message_read_status status = ALL_DATA_READ;
line = evbuffer_readln(buffer, NULL, EVBUFFER_EOL_ANY);
if (line == NULL)
return (MORE_DATA_EXPECTED);
switch (req->kind) {
case EVRTSP_RESPONSE:
if (evrtsp_parse_response_line(req, line) == -1)
status = DATA_CORRUPTED;
break;
default:
status = DATA_CORRUPTED;
}
free(line);
return (status);
}
static int
evrtsp_append_to_last_header(struct evkeyvalq *headers, const char *line)
{
struct evkeyval *header = TAILQ_LAST(headers, evkeyvalq);
char *newval;
size_t old_len, line_len;
if (header == NULL)
return (-1);
old_len = strlen(header->value);
line_len = strlen(line);
newval = realloc(header->value, old_len + line_len + 1);
if (newval == NULL)
return (-1);
memcpy(newval + old_len, line, line_len + 1);
header->value = newval;
return (0);
}
enum message_read_status
evrtsp_parse_headers(struct evrtsp_request *req, struct evbuffer *buffer)
{
char *line;
enum message_read_status status = MORE_DATA_EXPECTED;
struct evkeyvalq *headers = req->input_headers;
while ((line = evbuffer_readln(buffer, NULL, EVBUFFER_EOL_CRLF))
!= NULL) {
char *skey, *svalue;
if (*line == '\0') { /* Last header - Done */
status = ALL_DATA_READ;
free(line);
break;
}
/* Check if this is a continuation line */
if (*line == ' ' || *line == '\t') {
if (evrtsp_append_to_last_header(headers, line) == -1)
goto error;
free(line);
continue;
}
/* Processing of header lines */
svalue = line;
skey = strsep(&svalue, ":");
if (svalue == NULL)
goto error;
svalue += strspn(svalue, " ");
if (evrtsp_add_header(headers, skey, svalue) == -1)
goto error;
free(line);
}
return (status);
error:
free(line);
return (DATA_CORRUPTED);
}
static int
evrtsp_get_body_length(struct evrtsp_request *req)
{
struct evkeyvalq *headers = req->input_headers;
const char *content_length;
content_length = evrtsp_find_header(headers, "Content-Length");
if (content_length == NULL) {
/* If there is no Content-Length: header, a value of 0 is assumed, per spec. */
req->ntoread = 0;
} else {
ev_int64_t ntoread = evutil_strtoll(content_length, NULL, 10);
if (*content_length == '\0' || ntoread < 0) {
event_warnx("%s: illegal content length: %s",
__func__, content_length);
return (-1);
}
req->ntoread = ntoread;
}
event_debug(("%s: bytes to read: %lld (in buffer %zu)",
__func__, req->ntoread,
evbuffer_get_length(req->evcon->input_buffer)));
return (0);
}
static void
evrtsp_get_body(struct evrtsp_connection *evcon, struct evrtsp_request *req)
{
evcon->state = EVCON_READING_BODY;
if (evrtsp_get_body_length(req) == -1) {
event_warn("%s: invalid body", __func__);
evrtsp_connection_fail(evcon, EVCON_RTSP_INVALID_HEADER);
return;
}
evrtsp_read_body(evcon, req);
}
static void
evrtsp_read_firstline(struct evrtsp_connection *evcon,
struct evrtsp_request *req)
{
enum message_read_status res;
res = evrtsp_parse_firstline(req, evcon->input_buffer);
if (res == DATA_CORRUPTED) {
/* Error while reading, terminate */
event_warnx("%s: bad header lines on %d",
__func__, evcon->fd);
evrtsp_connection_fail(evcon, EVCON_RTSP_INVALID_HEADER);
return;
} else if (res == MORE_DATA_EXPECTED) {
/* Need more header lines */
evrtsp_add_event(&evcon->ev,
evcon->timeout, RTSP_READ_TIMEOUT);
return;
}
evcon->state = EVCON_READING_HEADERS;
evrtsp_read_header(evcon, req);
}
static void
evrtsp_read_header(struct evrtsp_connection *evcon, struct evrtsp_request *req)
{
enum message_read_status res;
int fd = evcon->fd;
res = evrtsp_parse_headers(req, evcon->input_buffer);
if (res == DATA_CORRUPTED) {
/* Error while reading, terminate */
event_warnx("%s: bad header lines on %d", __func__, fd);
evrtsp_connection_fail(evcon, EVCON_RTSP_INVALID_HEADER);
return;
} else if (res == MORE_DATA_EXPECTED) {
/* Need more header lines */
evrtsp_add_event(&evcon->ev,
evcon->timeout, RTSP_READ_TIMEOUT);
return;
}
/* Done reading headers, do the real work */
switch (req->kind) {
case EVRTSP_RESPONSE:
event_debug(("%s: start of read body on %d",
__func__, fd));
evrtsp_get_body(evcon, req);
break;
default:
event_warnx("%s: bad header on %d", __func__, fd);
evrtsp_connection_fail(evcon, EVCON_RTSP_INVALID_HEADER);
break;
}
}
/*
* Creates a TCP connection to the specified port and executes a callback
* when finished. Failure or sucess is indicate by the passed connection
* object.
*
* Although this interface accepts a hostname, it is intended to take
* only numeric hostnames so that non-blocking DNS resolution can
* happen elsewhere.
*/
struct evrtsp_connection *
evrtsp_connection_new(const char *address, unsigned short port)
{
struct evrtsp_connection *evcon = NULL;
char *intf;
char *addr;
unsigned char scratch[16];
int family;
if ((addr = strdup(address)) == NULL) {
event_warn("%s: strdup failed", __func__);
goto error;
}
intf = strchr(addr, '%');
if (intf)
*intf = '\0';
if (inet_pton(AF_INET6, addr, scratch) == 1)
family = AF_INET6;
else if (inet_pton(AF_INET, addr, scratch) == 1)
family = AF_INET;
else {
free(addr);
event_warn("%s: address is neither IPv6 nor IPv4", __func__);
return NULL;
}
if (intf)
*intf = '%';
event_debug(("Attempting connection to %s:%d", address, port));
if ((evcon = calloc(1, sizeof(struct evrtsp_connection))) == NULL) {
free(addr);
event_warn("%s: calloc failed", __func__);
goto error;
}
evcon->fd = -1;
evcon->port = port;
evcon->timeout = -1;
evcon->cseq = 1;
evcon->family = family;
evcon->address = addr;
if ((evcon->input_buffer = evbuffer_new()) == NULL) {
event_warn("%s: evbuffer_new failed", __func__);
goto error;
}
if ((evcon->output_buffer = evbuffer_new()) == NULL) {
event_warn("%s: evbuffer_new failed", __func__);
goto error;
}
if ((evcon->input_raw = evbuffer_new()) == NULL) {
event_warn("%s: evbuffer_new failed", __func__);
goto error;
}
if ((evcon->output_raw = evbuffer_new()) == NULL) {
event_warn("%s: evbuffer_new failed", __func__);
goto error;
}
evcon->state = EVCON_DISCONNECTED;
TAILQ_INIT(&evcon->requests);
return (evcon);
error:
if (evcon != NULL)
evrtsp_connection_free(evcon);
return (NULL);
}
void evrtsp_connection_set_base(struct evrtsp_connection *evcon,
struct event_base *base)
{
assert(evcon->base == NULL);
assert(evcon->state == EVCON_DISCONNECTED);
evcon->base = base;
}
void
evrtsp_connection_set_timeout(struct evrtsp_connection *evcon,
int timeout_in_secs)
{
evcon->timeout = timeout_in_secs;
}
void
evrtsp_connection_set_closecb(struct evrtsp_connection *evcon,
void (*cb)(struct evrtsp_connection *, void *), void *cbarg)
{
evcon->closecb = cb;
evcon->closecb_arg = cbarg;
}
void
evrtsp_connection_set_ciphercb(struct evrtsp_connection *evcon,
int (*cb)(struct evbuffer *, struct evbuffer *, void *, int encrypt),
void *cbarg)
{
evcon->ciphercb = cb;
evcon->ciphercb_arg = cbarg;
}
void
evrtsp_connection_get_local_address(struct evrtsp_connection *evcon,
char **address, u_short *port, int *family)
{
union {
struct sockaddr_storage ss;
struct sockaddr sa;
struct sockaddr_in sin;
struct sockaddr_in6 sin6;
} addr;
socklen_t slen;
int ret;
*address = NULL;
*port = 0;
memset(&addr, 0, sizeof(addr));
if (!evrtsp_connected(evcon))
return;
slen = sizeof(struct sockaddr_storage);
ret = getsockname(evcon->fd, &addr.sa, &slen);
if (ret < 0)
return;
name_from_addr(&addr.sa, slen, address, NULL);
if (!*address)
return;
*family = addr.sa.sa_family;
switch (*family)
{
case AF_INET:
*port = ntohs(addr.sin.sin_port);
break;
#ifdef AF_INET6
case AF_INET6:
*port = ntohs(addr.sin6.sin6_port);
break;
#endif
default:
free(*address);
*address = NULL;
event_err(1, "%s: unhandled address family\n", __func__);
return;
}
}
void
evrtsp_connection_get_peer(struct evrtsp_connection *evcon,
char **address, u_short *port)
{
*address = evcon->address;
*port = evcon->port;
}
int
evrtsp_connection_connect(struct evrtsp_connection *evcon)
{
if (evcon->state == EVCON_CONNECTING)
return (0);
evrtsp_connection_reset(evcon);
evcon->fd = bind_socket(evcon->family,
evcon->bind_address, evcon->bind_port, 0 /*reuse*/);
if (evcon->fd == -1) {
event_warnx("%s: failed to bind to \"%s\"",
__func__, evcon->bind_address);
return (-1);
}
if (socket_connect(evcon->fd, evcon->address, evcon->port) == -1) {
EVUTIL_CLOSESOCKET(evcon->fd); evcon->fd = -1;
return (-1);
}
/* Set up a callback for successful connection setup */
event_assign(&evcon->ev, evcon->base, evcon->fd, EV_WRITE, evrtsp_connectioncb, evcon);
evrtsp_add_event(&evcon->ev, evcon->timeout, RTSP_CONNECT_TIMEOUT);
evcon->state = EVCON_CONNECTING;
return (0);
}
/*
* Starts an RTSP request on the provided evrtsp_connection object.
* If the connection object is not connected to the server already,
* this will start the connection.
*/
int
evrtsp_make_request(struct evrtsp_connection *evcon,
struct evrtsp_request *req,
enum evrtsp_cmd_type type, const char *uri)
{
event_debug(("%s: TEST", __func__));
/* We are making a request */
req->kind = EVRTSP_REQUEST;
req->type = type;
if (req->uri != NULL)
free(req->uri);
if ((req->uri = strdup(uri)) == NULL)
event_err(1, "%s: strdup", __func__);
/* Set the protocol version if it is not supplied */
if (!req->major && !req->minor) {
req->major = 1;
req->minor = 0;
}
assert(req->evcon == NULL);
req->evcon = evcon;
assert(!(req->flags & EVRTSP_REQ_OWN_CONNECTION));
TAILQ_INSERT_TAIL(&evcon->requests, req, next);
/* If the connection object is not connected; make it so */
if (!evrtsp_connected(evcon))
return (evrtsp_connection_connect(evcon));
/*
* If it's connected already and we are the first in the queue,
* then we can dispatch this request immediately. Otherwise, it
* will be dispatched once the pending requests are completed.
*/
if (TAILQ_FIRST(&evcon->requests) == req)
evrtsp_request_dispatch(evcon);
return (0);
}
/*
* Reads data from file descriptor into request structure
* Request structure needs to be set up correctly.
*/
void
evrtsp_start_read(struct evrtsp_connection *evcon)
{
/* Set up an event to read the headers */
if (event_initialized(&evcon->ev))
event_del(&evcon->ev);
event_assign(&evcon->ev, evcon->base, evcon->fd, EV_READ, evrtsp_read, evcon);
evrtsp_add_event(&evcon->ev, evcon->timeout, RTSP_READ_TIMEOUT);
evcon->state = EVCON_READING_FIRSTLINE;
}
/*
* Request related functions
*/
struct evrtsp_request *
evrtsp_request_new(void (*cb)(struct evrtsp_request *, void *), void *arg)
{
struct evrtsp_request *req = NULL;
/* Allocate request structure */
if ((req = calloc(1, sizeof(struct evrtsp_request))) == NULL) {
event_warn("%s: calloc", __func__);
goto error;
}
req->kind = EVRTSP_RESPONSE;
req->input_headers = calloc(1, sizeof(struct evkeyvalq));
if (req->input_headers == NULL) {
event_warn("%s: calloc", __func__);
goto error;
}
TAILQ_INIT(req->input_headers);
req->output_headers = calloc(1, sizeof(struct evkeyvalq));
if (req->output_headers == NULL) {
event_warn("%s: calloc", __func__);
goto error;
}
TAILQ_INIT(req->output_headers);
if ((req->input_buffer = evbuffer_new()) == NULL) {
event_warn("%s: evbuffer_new", __func__);
goto error;
}
if ((req->output_buffer = evbuffer_new()) == NULL) {
event_warn("%s: evbuffer_new", __func__);
goto error;
}
req->cb = cb;
req->cb_arg = arg;
return (req);
error:
if (req != NULL)
evrtsp_request_free(req);
return (NULL);
}
void
evrtsp_request_free(struct evrtsp_request *req)
{
if (req->uri != NULL)
free(req->uri);
if (req->response_code_line != NULL)
free(req->response_code_line);
evrtsp_clear_headers(req->input_headers);
free(req->input_headers);
evrtsp_clear_headers(req->output_headers);
free(req->output_headers);
if (req->input_buffer != NULL)
evbuffer_free(req->input_buffer);
if (req->output_buffer != NULL)
evbuffer_free(req->output_buffer);
free(req);
}
/*
* Allows for inspection of the request URI
*/
const char *
evrtsp_request_uri(struct evrtsp_request *req) {
if (req->uri == NULL)
event_warn("%s: request has no uri", __func__);
return (req->uri);
}
/*
* Network helper functions that we do not want to export to the rest of
* the world.
*/
#if 0 /* Unused */
static struct addrinfo *
addr_from_name(char *address)
{
#ifdef EVENT__HAVE_GETADDRINFO
struct addrinfo ai, *aitop;
int ai_result;
memset(&ai, 0, sizeof(ai));
ai.ai_family = AF_INET;
ai.ai_socktype = SOCK_RAW;
ai.ai_flags = 0;
if ((ai_result = getaddrinfo(address, NULL, &ai, &aitop)) != 0) {
if ( ai_result == EAI_SYSTEM )
event_warn("getaddrinfo");
else
event_warnx("getaddrinfo: %s", gai_strerror(ai_result));
}
return (aitop);
#else
assert(0);
return NULL; /* XXXXX Use gethostbyname, if this function is ever used. */
#endif
}
#endif
static void
name_from_addr(struct sockaddr *sa, socklen_t salen,
char **phost, char **pport)
{
char ntop[NI_MAXHOST];
char strport[NI_MAXSERV];
int ni_result;
#ifdef EVENT__HAVE_GETNAMEINFO
ni_result = getnameinfo(sa, salen,
ntop, sizeof(ntop), strport, sizeof(strport),
NI_NUMERICHOST|NI_NUMERICSERV);
if (ni_result != 0) {
if (ni_result == EAI_SYSTEM)
event_err(1, "getnameinfo failed");
else
event_errx(1, "getnameinfo failed: %s", gai_strerror(ni_result));
return;
}
#else
ni_result = fake_getnameinfo(sa, salen,
ntop, sizeof(ntop), strport, sizeof(strport),
NI_NUMERICHOST|NI_NUMERICSERV);
if (ni_result != 0)
return;
#endif
if (phost)
*phost = strdup(ntop);
if (pport)
*pport = strdup(strport);
}
/* Create a non-blocking socket and bind it */
/* todo: rename this function */
static int
bind_socket_ai(int family, struct addrinfo *ai, int reuse)
{
int fd, on = 1, r;
int serrno;
if (ai)
family = ai->ai_family;
/* Create listen socket */
fd = socket(family, SOCK_STREAM, 0);
if (fd == -1) {
event_warn("socket");
return (-1);
}
if (evutil_make_socket_nonblocking(fd) < 0)
goto out;
#ifndef WIN32
if (fcntl(fd, F_SETFD, 1) == -1) {
event_warn("fcntl(F_SETFD)");
goto out;
}
#endif
if (family == AF_INET6) {
r = setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on));
if (r == -1) {
event_warn("IPV6_V6ONLY");
}
}
r = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&on, sizeof(on));
if (r == -1) {
event_warn("SO_KEEPALIVE");
}
if (reuse) {
r = setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (void *)&on, sizeof(on));
if (r == -1) {
event_warn("SO_REUSEADDR");
}
}
if (ai != NULL) {
r = bind(fd, ai->ai_addr, ai->ai_addrlen);
if (r == -1)
goto out;
}
return (fd);
out:
serrno = EVUTIL_SOCKET_ERROR();
EVUTIL_CLOSESOCKET(fd);
EVUTIL_SET_SOCKET_ERROR(serrno);
return (-1);
}
static struct addrinfo *
make_addrinfo(const char *address, u_short port)
{
struct addrinfo *aitop = NULL;
#ifdef EVENT__HAVE_GETADDRINFO
struct addrinfo ai;
char strport[NI_MAXSERV];
int ai_result;
memset(&ai, 0, sizeof(ai));
ai.ai_family = AF_UNSPEC;
ai.ai_socktype = SOCK_STREAM;
ai.ai_flags = AI_PASSIVE; /* turn NULL host name into INADDR_ANY */
evutil_snprintf(strport, sizeof(strport), "%d", port);
if ((ai_result = getaddrinfo(address, strport, &ai, &aitop)) != 0) {
if ( ai_result == EAI_SYSTEM )
event_warn("getaddrinfo");
else
event_warnx("getaddrinfo: %s", gai_strerror(ai_result));
return (NULL);
}
#else
static int cur;
static struct addrinfo ai[2]; /* We will be returning the address of some of this memory so it has to last even after this call. */
if (++cur == 2) cur = 0; /* allow calling this function twice */
if (fake_getaddrinfo(address, &ai[cur]) < 0) {
event_warn("fake_getaddrinfo");
return (NULL);
}
aitop = &ai[cur];
((struct sockaddr_in *) aitop->ai_addr)->sin_port = htons(port);
#endif
return (aitop);
}
static int
bind_socket(int family, const char *address, u_short port, int reuse)
{
int fd;
struct addrinfo *aitop = NULL;
/* just create an unbound socket */
if (address == NULL && port == 0)
return bind_socket_ai(family, NULL, 0);
aitop = make_addrinfo(address, port);
if (aitop == NULL)
return (-1);
fd = bind_socket_ai(family, aitop, reuse);
#ifdef EVENT__HAVE_GETADDRINFO
freeaddrinfo(aitop);
#else
fake_freeaddrinfo(aitop);
#endif
return (fd);
}
static int
socket_connect(int fd, const char *address, unsigned short port)
{
struct addrinfo *ai = make_addrinfo(address, port);
int res = -1;
if (ai == NULL) {
event_warnx("%s: make_addrinfo: \"%s:%d\"",
__func__, address, port);
return (-1);
}
if (connect(fd, ai->ai_addr, ai->ai_addrlen) == -1) {
#ifdef WIN32
int tmp_error = WSAGetLastError();
if (tmp_error != WSAEWOULDBLOCK && tmp_error != WSAEINVAL &&
tmp_error != WSAEINPROGRESS) {
goto out;
}
#else
if (errno != EINPROGRESS) {
goto out;
}
#endif
}
/* everything is fine */
res = 0;
out:
#ifdef EVENT__HAVE_GETADDRINFO
freeaddrinfo(ai);
#else
fake_freeaddrinfo(ai);
#endif
return (res);
}
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