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icecast-server/src/fserve.c

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/* Icecast
*
* This program is distributed under the GNU General Public License, version 2.
* A copy of this license is included with this source.
*
* Copyright 2000-2004, Jack Moffitt <jack@xiph.org,
* Michael Smith <msmith@xiph.org>,
* oddsock <oddsock@xiph.org>,
* Karl Heyes <karl@xiph.org>
* and others (see AUTHORS for details).
* Copyright 2011-2018, Philipp "ph3-der-loewe" Schafft <lion@lion.leolix.org>.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#ifdef HAVE_POLL
#include <sys/poll.h>
#endif
#ifndef _WIN32
#include <unistd.h>
#include <sys/time.h>
#include <sys/socket.h>
#define SCN_OFF_T SCNdMAX
#define PRI_OFF_T PRIdMAX
#else
#include <winsock2.h>
#include <windows.h>
#define SCN_OFF_T "ld"
#define PRI_OFF_T "ld"
#ifndef S_ISREG
#define S_ISREG(mode) ((mode) & _S_IFREG)
#endif
#endif
#include "common/thread/thread.h"
#include "common/avl/avl.h"
#include "common/httpp/httpp.h"
#include "common/net/sock.h"
#include "connection.h"
#include "global.h"
#include "refbuf.h"
#include "client.h"
#include "errors.h"
#include "stats.h"
#include "format.h"
#include "logging.h"
#include "cfgfile.h"
#include "util.h"
#include "admin.h"
#include "compat.h"
#include "fserve.h"
#undef CATMODULE
#define CATMODULE "fserve"
#define BUFSIZE 4096
static volatile int __inited = 0;
static fserve_t *active_list = NULL;
static fserve_t *pending_list = NULL;
static spin_t pending_lock;
static avl_tree *mimetypes = NULL;
static volatile int run_fserv = 0;
static unsigned int fserve_clients;
static int client_tree_changed = 0;
#ifdef HAVE_POLL
static struct pollfd *ufds = NULL;
#else
static fd_set fds;
static sock_t fd_max = SOCK_ERROR;
#endif
typedef struct {
char *ext;
char *type;
} mime_type;
static void fserve_client_destroy(fserve_t *fclient);
static int _delete_mapping(void *mapping);
static void *fserv_thread_function(void *arg);
void fserve_initialize(void)
{
ice_config_t *config = config_get_config();
mimetypes = NULL;
active_list = NULL;
pending_list = NULL;
thread_spin_create (&pending_lock);
fserve_recheck_mime_types (config);
config_release_config();
__inited = 1;
stats_event (NULL, "file_connections", "0");
ICECAST_LOG_INFO("file serving started");
}
void fserve_shutdown(void)
{
if (!__inited)
return;
thread_spin_lock (&pending_lock);
run_fserv = 0;
while (pending_list)
{
fserve_t *to_go = (fserve_t *)pending_list;
pending_list = to_go->next;
fserve_client_destroy (to_go);
}
while (active_list)
{
fserve_t *to_go = active_list;
active_list = to_go->next;
fserve_client_destroy (to_go);
}
if (mimetypes)
avl_tree_free (mimetypes, _delete_mapping);
thread_spin_unlock (&pending_lock);
thread_spin_destroy (&pending_lock);
ICECAST_LOG_INFO("file serving stopped");
}
#ifdef HAVE_POLL
int fserve_client_waiting (void)
{
fserve_t *fclient;
unsigned int i = 0;
/* only rebuild ufds if there are clients added/removed */
if (client_tree_changed) {
struct pollfd *ufds_new = realloc(ufds, fserve_clients * sizeof(struct pollfd));
/* REVIEW: If we can not allocate new ufds, keep old ones for now. */
if (ufds_new || fserve_clients == 0) {
ufds = ufds_new;
client_tree_changed = 0;
fclient = active_list;
while (fclient)
{
ufds[i].fd = fclient->client->con->sock;
ufds[i].events = POLLOUT;
ufds[i].revents = 0;
fclient = fclient->next;
i++;
}
}
}
if (!ufds) {
thread_spin_lock (&pending_lock);
run_fserv = 0;
thread_spin_unlock (&pending_lock);
return -1;
} else if (poll(ufds, fserve_clients, 200) > 0) {
/* mark any clients that are ready */
fclient = active_list;
for (i=0; i<fserve_clients; i++)
{
if (ufds[i].revents & (POLLOUT|POLLHUP|POLLERR))
fclient->ready = 1;
fclient = fclient->next;
}
return 1;
}
return 0;
}
#else
int fserve_client_waiting(void)
{
fserve_t *fclient;
fd_set realfds;
/* only rebuild fds if there are clients added/removed */
if (client_tree_changed) {
client_tree_changed = 0;
FD_ZERO(&fds);
fd_max = SOCK_ERROR;
fclient = active_list;
while (fclient) {
FD_SET(fclient->client->con->sock, &fds);
if (fclient->client->con->sock > fd_max || fd_max == SOCK_ERROR)
fd_max = fclient->client->con->sock;
fclient = fclient->next;
}
}
/* hack for windows, select needs at least 1 descriptor */
if (fd_max == SOCK_ERROR)
{
thread_spin_lock (&pending_lock);
run_fserv = 0;
thread_spin_unlock (&pending_lock);
return -1;
}
else
{
struct timeval tv;
tv.tv_sec = 0;
tv.tv_usec = 200000;
/* make a duplicate of the set so we do not have to rebuild it
* each time around */
memcpy(&realfds, &fds, sizeof(fd_set));
if(select(fd_max+1, NULL, &realfds, NULL, &tv) > 0)
{
/* mark any clients that are ready */
fclient = active_list;
while (fclient)
{
if (FD_ISSET (fclient->client->con->sock, &realfds))
fclient->ready = 1;
fclient = fclient->next;
}
return 1;
}
}
return 0;
}
#endif
static int wait_for_fds(void)
{
fserve_t *fclient;
int ret;
while (run_fserv)
{
/* add any new clients here */
if (pending_list)
{
thread_spin_lock (&pending_lock);
fclient = (fserve_t*)pending_list;
while (fclient)
{
fserve_t *to_move = fclient;
fclient = fclient->next;
to_move->next = active_list;
active_list = to_move;
client_tree_changed = 1;
fserve_clients++;
}
pending_list = NULL;
thread_spin_unlock(&pending_lock);
}
/* drop out of here if someone is ready */
ret = fserve_client_waiting();
if (ret)
return ret;
}
return -1;
}
static void *fserv_thread_function(void *arg)
{
fserve_t *fclient, **trail;
size_t bytes;
(void)arg;
while (1)
{
if (wait_for_fds() < 0)
break;
fclient = active_list;
trail = &active_list;
while (fclient)
{
/* process this client, if it is ready */
if (fclient->ready)
{
client_t *client = fclient->client;
refbuf_t *refbuf = client->refbuf;
fclient->ready = 0;
if (client->pos == refbuf->len)
{
/* Grab a new chunk */
if (fclient->file)
bytes = fread (refbuf->data, 1, BUFSIZE, fclient->file);
else
bytes = 0;
if (bytes == 0)
{
if (refbuf->next == NULL)
{
fserve_t *to_go = fclient;
fclient = fclient->next;
*trail = fclient;
fserve_client_destroy (to_go);
fserve_clients--;
client_tree_changed = 1;
continue;
}
refbuf = refbuf->next;
client->refbuf->next = NULL;
refbuf_release (client->refbuf);
client->refbuf = refbuf;
bytes = refbuf->len;
}
refbuf->len = (unsigned int)bytes;
client->pos = 0;
}
/* Now try and send current chunk. */
format_generic_write_to_client (client);
if (client->con->error)
{
fserve_t *to_go = fclient;
fclient = fclient->next;
*trail = fclient;
fserve_clients--;
fserve_client_destroy (to_go);
client_tree_changed = 1;
continue;
}
}
trail = &fclient->next;
fclient = fclient->next;
}
}
ICECAST_LOG_DEBUG("fserve handler exit");
return NULL;
}
/* string returned needs to be free'd */
char *fserve_content_type(const char *path)
{
char *ext = util_get_extension(path);
mime_type exttype = {ext, NULL};
void *result;
char *type;
thread_spin_lock (&pending_lock);
if (mimetypes && !avl_get_by_key (mimetypes, &exttype, &result))
{
mime_type *mime = result;
type = strdup (mime->type);
}
else {
/* Fallbacks for a few basic ones */
if(!strcmp(ext, "ogg"))
type = strdup ("application/ogg");
else if(!strcmp(ext, "mp3"))
type = strdup ("audio/mpeg");
else if(!strcmp(ext, "html"))
type = strdup ("text/html");
else if(!strcmp(ext, "css"))
type = strdup ("text/css");
else if(!strcmp(ext, "txt"))
type = strdup ("text/plain");
else if(!strcmp(ext, "jpg"))
type = strdup ("image/jpeg");
else if(!strcmp(ext, "png"))
type = strdup ("image/png");
else if(!strcmp(ext, "m3u"))
type = strdup ("audio/x-mpegurl");
else if(!strcmp(ext, "aac"))
type = strdup ("audio/aac");
else
type = strdup ("application/octet-stream");
}
thread_spin_unlock (&pending_lock);
return type;
}
static void fserve_client_destroy(fserve_t *fclient)
{
if (fclient)
{
if (fclient->file)
fclose (fclient->file);
if (fclient->callback)
fclient->callback (fclient->client, fclient->arg);
else
if (fclient->client)
client_destroy (fclient->client);
free (fclient);
}
}
/* client has requested a file, so check for it and send the file. Do not
* refer to the client_t afterwards. return 0 for success, -1 on error.
*/
int fserve_client_create (client_t *httpclient, const char *path)
{
int bytes;
struct stat file_buf;
const char *range = NULL;
off_t new_content_len = 0;
off_t rangenumber = 0, content_length;
int rangeproblem = 0;
int ret = 0;
char *fullpath;
int m3u_requested = 0, m3u_file_available = 1;
const char * xslt_playlist_requested = NULL;
int xslt_playlist_file_available = 1;
ice_config_t *config;
FILE *file;
fullpath = util_get_path_from_normalised_uri (path);
ICECAST_LOG_INFO("checking for file %H (%H)", path, fullpath);
if (strcmp (util_get_extension (fullpath), "m3u") == 0)
m3u_requested = 1;
if (strcmp (util_get_extension (fullpath), "xspf") == 0)
xslt_playlist_requested = "xspf.xsl";
if (strcmp (util_get_extension (fullpath), "vclt") == 0)
xslt_playlist_requested = "vclt.xsl";
/* check for the actual file */
if (stat (fullpath, &file_buf) != 0)
{
/* the m3u can be generated, but send an m3u file if available */
if (m3u_requested == 0 && xslt_playlist_requested == NULL)
{
ICECAST_LOG_WARN("req for file \"%H\" %s", fullpath, strerror (errno));
client_send_error_by_id(httpclient, ICECAST_ERROR_FSERV_FILE_NOT_FOUND);
free (fullpath);
return -1;
}
m3u_file_available = 0;
xslt_playlist_file_available = 0;
}
httpclient->refbuf->len = PER_CLIENT_REFBUF_SIZE;
if (m3u_requested && m3u_file_available == 0)
{
const char *host = httpp_getvar (httpclient->parser, "host");
char *sourceuri = strdup (path);
char *dot = strrchr(sourceuri, '.');
/* at least a couple of players (fb2k/winamp) are reported to send a
* host header but without the port number. So if we are missing the
* port then lets treat it as if no host line was sent */
if (host && strchr (host, ':') == NULL)
host = NULL;
*dot = 0;
httpclient->respcode = 200;
ret = util_http_build_header (httpclient->refbuf->data, BUFSIZE, 0,
0, 200, NULL,
"audio/x-mpegurl", NULL, "", NULL, httpclient);
if (ret == -1 || ret >= (BUFSIZE - 512)) { /* we want at least 512 bytes left for the content of the playlist */
ICECAST_LOG_ERROR("Dropping client as we can not build response headers.");
client_send_error_by_id(httpclient, ICECAST_ERROR_GEN_HEADER_GEN_FAILED);
free(sourceuri);
return -1;
}
if (host == NULL)
{
config = config_get_config();
snprintf (httpclient->refbuf->data + ret, BUFSIZE - ret,
"http://%s:%d%s\r\n",
config->hostname, config->port,
sourceuri
);
config_release_config();
}
else
{
snprintf (httpclient->refbuf->data + ret, BUFSIZE - ret,
"http://%s%s\r\n",
host,
sourceuri
);
}
httpclient->refbuf->len = strlen (httpclient->refbuf->data);
fserve_add_client (httpclient, NULL);
free (sourceuri);
free (fullpath);
return 0;
}
if (xslt_playlist_requested && xslt_playlist_file_available == 0)
{
xmlDocPtr doc;
char *reference = strdup (path);
char *eol = strrchr (reference, '.');
if (eol)
*eol = '\0';
doc = stats_get_xml (0, reference, httpclient->mode);
free (reference);
admin_send_response (doc, httpclient, ADMIN_FORMAT_TRANSFORMED, xslt_playlist_requested);
xmlFreeDoc(doc);
free (fullpath);
return 0;
}
/* on demand file serving check */
config = config_get_config();
if (config->fileserve == 0)
{
ICECAST_LOG_DEBUG("on demand file \"%H\" refused. Serving static files has been disabled in the config", fullpath);
client_send_error_by_id(httpclient, ICECAST_ERROR_FSERV_FILE_NOT_FOUND);
config_release_config();
free(fullpath);
return -1;
}
config_release_config();
if (S_ISREG (file_buf.st_mode) == 0)
{
client_send_error_by_id(httpclient, ICECAST_ERROR_FSERV_FILE_NOT_FOUND);
ICECAST_LOG_WARN("found requested file but there is no handler for it: %H", fullpath);
free (fullpath);
return -1;
}
file = fopen (fullpath, "rb");
if (file == NULL)
{
ICECAST_LOG_WARN("Problem accessing file \"%H\"", fullpath);
client_send_error_by_id(httpclient, ICECAST_ERROR_FSERV_FILE_NOT_READABLE);
free (fullpath);
return -1;
}
free (fullpath);
content_length = file_buf.st_size;
range = httpp_getvar (httpclient->parser, "range");
/* full http range handling is currently not done but we deal with the common case */
if (range != NULL) {
ret = 0;
if (strncasecmp (range, "bytes=", 6) == 0)
ret = sscanf (range+6, "%" SCN_OFF_T "-", &rangenumber);
if (ret != 1) {
/* format not correct, so lets just assume
we start from the beginning */
rangeproblem = 1;
}
if (rangenumber < 0) {
rangeproblem = 1;
}
if (!rangeproblem) {
ret = fseeko (file, rangenumber, SEEK_SET);
if (ret != -1) {
new_content_len = content_length - rangenumber;
if (new_content_len < 0) {
rangeproblem = 1;
}
}
else {
rangeproblem = 1;
}
if (!rangeproblem) {
off_t endpos = rangenumber+new_content_len-1;
char *type;
if (endpos < 0) {
endpos = 0;
}
httpclient->respcode = 206;
type = fserve_content_type (path);
bytes = util_http_build_header (httpclient->refbuf->data, BUFSIZE, 0,
0, 206, NULL,
type, NULL,
NULL, NULL, httpclient);
if (bytes == -1 || bytes >= (BUFSIZE - 512)) { /* we want at least 512 bytes left */
ICECAST_LOG_ERROR("Dropping client as we can not build response headers.");
client_send_error_by_id(httpclient, ICECAST_ERROR_GEN_HEADER_GEN_FAILED);
return -1;
}
bytes += snprintf (httpclient->refbuf->data + bytes, BUFSIZE - bytes,
"Accept-Ranges: bytes\r\n"
"Content-Length: %" PRI_OFF_T "\r\n"
"Content-Range: bytes %" PRI_OFF_T \
"-%" PRI_OFF_T "/%" PRI_OFF_T "\r\n\r\n",
new_content_len,
rangenumber,
endpos,
content_length);
free (type);
}
else {
goto fail;
}
}
else {
goto fail;
}
}
else {
char *type = fserve_content_type(path);
httpclient->respcode = 200;
bytes = util_http_build_header (httpclient->refbuf->data, BUFSIZE, 0,
0, 200, NULL,
type, NULL,
NULL, NULL, httpclient);
if (bytes == -1 || bytes >= (BUFSIZE - 512)) { /* we want at least 512 bytes left */
ICECAST_LOG_ERROR("Dropping client as we can not build response headers.");
client_send_error_by_id(httpclient, ICECAST_ERROR_GEN_HEADER_GEN_FAILED);
fclose(file);
return -1;
}
bytes += snprintf (httpclient->refbuf->data + bytes, BUFSIZE - bytes,
"Accept-Ranges: bytes\r\n"
"Content-Length: %" PRI_OFF_T "\r\n\r\n",
content_length);
free (type);
}
httpclient->refbuf->len = bytes;
httpclient->pos = 0;
stats_event_inc (NULL, "file_connections");
fserve_add_client (httpclient, file);
return 0;
fail:
fclose (file);
client_send_error_by_id(httpclient, ICECAST_ERROR_FSERV_REQUEST_RANGE_NOT_SATISFIABLE);
return -1;
}
/* Routine to actually add pre-configured client structure to pending list and
* then to start off the file serving thread if it is not already running
*/
static void fserve_add_pending (fserve_t *fclient)
{
thread_spin_lock (&pending_lock);
fclient->next = (fserve_t *)pending_list;
pending_list = fclient;
if (run_fserv == 0)
{
run_fserv = 1;
ICECAST_LOG_DEBUG("fserve handler waking up");
thread_create("File Serving Thread", fserv_thread_function, NULL, THREAD_DETACHED);
}
thread_spin_unlock (&pending_lock);
}
/* Add client to fserve thread, client needs to have refbuf set and filled
* but may provide a NULL file if no data needs to be read
*/
int fserve_add_client (client_t *client, FILE *file)
{
fserve_t *fclient = calloc (1, sizeof(fserve_t));
ICECAST_LOG_DEBUG("Adding client %p to file serving engine", client);
if (fclient == NULL)
{
client_send_error_by_id(client, ICECAST_ERROR_GEN_MEMORY_EXHAUSTED);
return -1;
}
fclient->file = file;
fclient->client = client;
fclient->ready = 0;
fserve_add_pending (fclient);
return 0;
}
/* add client to file serving engine, but just write out the buffer contents,
* then pass the client to the callback with the provided arg
*/
void fserve_add_client_callback (client_t *client, fserve_callback_t callback, void *arg)
{
fserve_t *fclient = calloc (1, sizeof(fserve_t));
ICECAST_LOG_DEBUG("Adding client to file serving engine");
if (fclient == NULL)
{
client_send_error_by_id(client, ICECAST_ERROR_GEN_MEMORY_EXHAUSTED);
return;
}
fclient->file = NULL;
fclient->client = client;
fclient->ready = 0;
fclient->callback = callback;
fclient->arg = arg;
fserve_add_pending(fclient);
}
static int _delete_mapping(void *mapping) {
mime_type *map = mapping;
free(map->ext);
free(map->type);
free(map);
return 1;
}
static int _compare_mappings(void *arg, void *a, void *b)
{
(void)arg;
return strcmp(
((mime_type *)a)->ext,
((mime_type *)b)->ext);
}
void fserve_recheck_mime_types(ice_config_t *config)
{
FILE *mimefile;
char line[4096];
char *type, *ext, *cur;
mime_type *mapping;
avl_tree *new_mimetypes;
if (config->mimetypes_fn == NULL)
return;
mimefile = fopen (config->mimetypes_fn, "r");
if (mimefile == NULL)
{
ICECAST_LOG_WARN("Cannot open mime types file %s", config->mimetypes_fn);
return;
}
new_mimetypes = avl_tree_new(_compare_mappings, NULL);
while(fgets(line, 4096, mimefile))
{
line[4095] = 0;
if(*line == 0 || *line == '#')
continue;
type = line;
cur = line;
while(*cur != ' ' && *cur != '\t' && *cur)
cur++;
if(*cur == 0)
continue;
*cur++ = 0;
while(1) {
while(*cur == ' ' || *cur == '\t')
cur++;
if(*cur == 0)
break;
ext = cur;
while(*cur != ' ' && *cur != '\t' && *cur != '\n' && *cur)
cur++;
*cur++ = 0;
if(*ext)
{
void *tmp;
/* Add a new extension->type mapping */
mapping = malloc(sizeof(mime_type));
mapping->ext = strdup(ext);
mapping->type = strdup(type);
if (!avl_get_by_key (new_mimetypes, mapping, &tmp))
avl_delete (new_mimetypes, mapping, _delete_mapping);
avl_insert (new_mimetypes, mapping);
}
}
}
fclose(mimefile);
thread_spin_lock (&pending_lock);
if (mimetypes)
avl_tree_free (mimetypes, _delete_mapping);
mimetypes = new_mimetypes;
thread_spin_unlock (&pending_lock);
}
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