mpd/src/interface.c

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/* the Music Player Daemon (MPD)
* (c)2003-2006 by Warren Dukes (warren.dukes@gmail.com)
* This project's homepage is: http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "interface.h"
#include "command.h"
#include "conf.h"
#include "list.h"
#include "log.h"
#include "listen.h"
#include "playlist.h"
#include "permission.h"
#include "sllist.h"
#include "utils.h"
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <sys/select.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/param.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <signal.h>
#define GREETING "OK MPD " PROTOCOL_VERSION "\n"
#define INTERFACE_MAX_BUFFER_LENGTH (40960)
#define INTERFACE_LIST_MODE_BEGIN "command_list_begin"
#define INTERFACE_LIST_OK_MODE_BEGIN "command_list_ok_begin"
#define INTERFACE_LIST_MODE_END "command_list_end"
#define INTERFACE_DEFAULT_OUT_BUFFER_SIZE (4096)
#define INTERFACE_TIMEOUT_DEFAULT (60)
#define INTERFACE_MAX_CONNECTIONS_DEFAULT (10)
#define INTERFACE_MAX_COMMAND_LIST_DEFAULT (2048*1024)
#define INTERFACE_MAX_OUTPUT_BUFFER_SIZE_DEFAULT (8192*1024)
/* set this to zero to indicate we have no possible interfaces */
static int interface_max_connections = 0; /*INTERFACE_MAX_CONNECTIONS_DEFAULT; */
static int interface_timeout = INTERFACE_TIMEOUT_DEFAULT;
static size_t interface_max_command_list_size =
INTERFACE_MAX_COMMAND_LIST_DEFAULT;
static size_t interface_max_output_buffer_size =
INTERFACE_MAX_OUTPUT_BUFFER_SIZE_DEFAULT;
/* maybe make conf option for this, or... 32 might be good enough */
static long int interface_list_cache_size = 32;
/* shared globally between all interfaces: */
static struct strnode *list_cache = NULL;
static struct strnode *list_cache_head = NULL;
static struct strnode *list_cache_tail = NULL;
typedef struct _Interface {
char buffer[INTERFACE_MAX_BUFFER_LENGTH];
int bufferLength;
int bufferPos;
int fd; /* file descriptor */
int permission;
time_t lastTime;
struct strnode *cmd_list; /* for when in list mode */
struct strnode *cmd_list_tail; /* for when in list mode */
int cmd_list_OK; /* print OK after each command execution */
int cmd_list_size; /* mem cmd_list consumes */
int cmd_list_dup; /* has the cmd_list been copied to private space? */
struct sllnode *deferred_send; /* for output if client is slow */
int deferred_bytes; /* mem deferred_send consumes */
int expired; /* set whether this interface should be closed on next
check of old interfaces */
int num; /* interface number */
char *send_buf;
int send_buf_used; /* bytes used this instance */
int send_buf_size; /* bytes usable this instance */
int send_buf_alloc; /* bytes actually allocated */
} Interface;
static Interface *interfaces = NULL;
static void flushInterfaceBuffer(Interface * interface);
static void printInterfaceOutBuffer(Interface * interface);
#ifdef SO_SNDBUF
static int get_default_snd_buf_size(Interface * interface)
{
int new_size;
socklen_t sockOptLen = sizeof(int);
if (getsockopt(interface->fd, SOL_SOCKET, SO_SNDBUF,
(char *)&new_size, &sockOptLen) < 0) {
DEBUG("problem getting sockets send buffer size\n");
return INTERFACE_DEFAULT_OUT_BUFFER_SIZE;
}
if (new_size > 0)
return new_size;
DEBUG("sockets send buffer size is not positive\n");
return INTERFACE_DEFAULT_OUT_BUFFER_SIZE;
}
#else /* !SO_SNDBUF */
static int get_default_snd_buf_size(Interface * interface)
{
return INTERFACE_DEFAULT_OUT_BUFFER_SIZE;
}
#endif /* !SO_SNDBUF */
static void set_send_buf_size(Interface * interface)
{
int new_size = get_default_snd_buf_size(interface);
if (interface->send_buf_size != new_size) {
interface->send_buf_size = new_size;
/* don't resize to get smaller, only bigger */
if (interface->send_buf_alloc < new_size) {
if (interface->send_buf)
free(interface->send_buf);
interface->send_buf = malloc(new_size);
interface->send_buf_alloc = new_size;
}
}
}
static void openInterface(Interface * interface, int fd)
{
int flags;
assert(interface->fd < 0);
interface->cmd_list_size = 0;
interface->cmd_list_dup = 0;
interface->cmd_list_OK = -1;
interface->bufferLength = 0;
interface->bufferPos = 0;
interface->fd = fd;
while ((flags = fcntl(fd, F_GETFL)) < 0 && errno == EINTR) ;
while (fcntl(fd, F_SETFL, flags | O_NONBLOCK) < 0 && errno == EINTR) ;
interface->lastTime = time(NULL);
interface->cmd_list = NULL;
interface->cmd_list_tail = NULL;
interface->deferred_send = NULL;
interface->expired = 0;
interface->deferred_bytes = 0;
interface->send_buf_used = 0;
interface->permission = getDefaultPermissions();
set_send_buf_size(interface);
xwrite(fd, GREETING, strlen(GREETING));
}
static void free_cmd_list(struct strnode *list)
{
struct strnode *tmp = list;
while (tmp) {
struct strnode *next = tmp->next;
if (tmp >= list_cache_head && tmp <= list_cache_tail) {
/* inside list_cache[] array */
tmp->data = NULL;
tmp->next = NULL;
} else
free(tmp);
tmp = next;
}
}
static void cmd_list_clone(Interface * interface)
{
struct strnode *new = dup_strlist(interface->cmd_list);
free_cmd_list(interface->cmd_list);
interface->cmd_list = new;
interface->cmd_list_dup = 1;
/* new tail */
while (new && new->next)
new = new->next;
interface->cmd_list_tail = new;
}
static void new_cmd_list_ptr(Interface * interface, char *s, const int size)
{
int i;
struct strnode *new;
if (!interface->cmd_list_dup) {
for (i = interface_list_cache_size - 1; i >= 0; --i) {
if (list_cache[i].data)
continue;
new = &(list_cache[i]);
new->data = s;
/* implied in free_cmd_list() and init: */
/* last->next->next = NULL; */
goto out;
}
}
/* allocate from the heap */
new = interface->cmd_list_dup ? new_strnode_dup(s, size)
: new_strnode(s);
out:
if (interface->cmd_list) {
interface->cmd_list_tail->next = new;
interface->cmd_list_tail = new;
} else
interface->cmd_list = interface->cmd_list_tail = new;
}
static void closeInterface(Interface * interface)
{
struct sllnode *buf;
if (interface->fd < 0)
return;
xclose(interface->fd);
interface->fd = -1;
if (interface->cmd_list) {
free_cmd_list(interface->cmd_list);
interface->cmd_list = NULL;
}
if ((buf = interface->deferred_send)) {
do {
struct sllnode *prev = buf;
buf = buf->next;
free(prev);
} while (buf);
interface->deferred_send = NULL;
}
SECURE("interface %i: closed\n", interface->num);
}
void openAInterface(int fd, struct sockaddr *addr)
{
int i;
for (i = 0; i < interface_max_connections
&& interfaces[i].fd >= 0; i++) /* nothing */ ;
if (i == interface_max_connections) {
ERROR("Max Connections Reached!\n");
xclose(fd);
} else {
SECURE("interface %i: opened from ", i);
switch (addr->sa_family) {
case AF_INET:
{
char *host = inet_ntoa(((struct sockaddr_in *)
addr)->sin_addr);
if (host) {
SECURE("%s\n", host);
} else {
SECURE("error getting ipv4 address\n");
}
}
break;
#ifdef HAVE_IPV6
case AF_INET6:
{
char host[INET6_ADDRSTRLEN + 1];
memset(host, 0, INET6_ADDRSTRLEN + 1);
if (inet_ntop(AF_INET6, (void *)
&(((struct sockaddr_in6 *)addr)->
sin6_addr), host,
INET6_ADDRSTRLEN)) {
SECURE("%s\n", host);
} else {
SECURE("error getting ipv6 address\n");
}
}
break;
#endif
case AF_UNIX:
SECURE("local connection\n");
break;
default:
SECURE("unknown\n");
}
openInterface(&(interfaces[i]), fd);
}
}
static int processLineOfInput(Interface * interface)
{
int ret = 1;
char *line = interface->buffer + interface->bufferPos;
if (interface->cmd_list_OK >= 0) {
if (strcmp(line, INTERFACE_LIST_MODE_END) == 0) {
DEBUG("interface %i: process command "
"list\n", interface->num);
ret = processListOfCommands(interface->fd,
&(interface->permission),
&(interface->expired),
interface->cmd_list_OK,
interface->cmd_list);
DEBUG("interface %i: process command "
"list returned %i\n", interface->num, ret);
if (ret == 0)
commandSuccess(interface->fd);
else if (ret == COMMAND_RETURN_CLOSE
|| interface->expired)
closeInterface(interface);
printInterfaceOutBuffer(interface);
free_cmd_list(interface->cmd_list);
interface->cmd_list = NULL;
interface->cmd_list_OK = -1;
} else {
size_t len = strlen(line) + 1;
interface->cmd_list_size += len;
if (interface->cmd_list_size >
interface_max_command_list_size) {
ERROR("interface %i: command "
"list size (%i) is "
"larger than the max "
"(%li)\n",
interface->num,
interface->cmd_list_size,
(long)interface_max_command_list_size);
closeInterface(interface);
ret = COMMAND_RETURN_CLOSE;
} else
new_cmd_list_ptr(interface, line, len);
}
} else {
if (strcmp(line, INTERFACE_LIST_MODE_BEGIN) == 0) {
interface->cmd_list_OK = 0;
ret = 1;
} else if (strcmp(line, INTERFACE_LIST_OK_MODE_BEGIN) == 0) {
interface->cmd_list_OK = 1;
ret = 1;
} else {
DEBUG("interface %i: process command \"%s\"\n",
interface->num, line);
ret = processCommand(interface->fd,
&(interface->permission), line);
DEBUG("interface %i: command returned %i\n",
interface->num, ret);
if (ret == 0)
commandSuccess(interface->fd);
else if (ret == COMMAND_RETURN_CLOSE
|| interface->expired) {
closeInterface(interface);
}
printInterfaceOutBuffer(interface);
}
}
return ret;
}
static int processBytesRead(Interface * interface, int bytesRead)
{
int ret = 0;
char *buf_tail = &(interface->buffer[interface->bufferLength - 1]);
while (bytesRead > 0) {
interface->bufferLength++;
bytesRead--;
buf_tail++;
if (*buf_tail == '\n') {
*buf_tail = '\0';
if (interface->bufferLength - interface->bufferPos > 1) {
if (*(buf_tail - 1) == '\r')
*(buf_tail - 1) = '\0';
}
ret = processLineOfInput(interface);
interface->bufferPos = interface->bufferLength;
}
if (interface->bufferLength == INTERFACE_MAX_BUFFER_LENGTH) {
if (interface->bufferPos == 0) {
ERROR("interface %i: buffer overflow\n",
interface->num);
closeInterface(interface);
return 1;
}
if (interface->cmd_list_OK >= 0 &&
!interface->cmd_list_dup)
cmd_list_clone(interface);
interface->bufferLength -= interface->bufferPos;
memmove(interface->buffer,
interface->buffer + interface->bufferPos,
interface->bufferLength);
interface->bufferPos = 0;
}
if (ret == COMMAND_RETURN_KILL || ret == COMMAND_RETURN_CLOSE) {
return ret;
}
}
return ret;
}
static int interfaceReadInput(Interface * interface)
{
int bytesRead;
bytesRead = read(interface->fd,
interface->buffer + interface->bufferLength,
INTERFACE_MAX_BUFFER_LENGTH - interface->bufferLength);
if (bytesRead > 0)
return processBytesRead(interface, bytesRead);
else if (bytesRead == 0 || (bytesRead < 0 && errno != EINTR)) {
closeInterface(interface);
} else
return 0;
return 1;
}
static void addInterfacesReadyToReadAndListenSocketToFdSet(fd_set * fds,
int *fdmax)
{
int i;
FD_ZERO(fds);
addListenSocketsToFdSet(fds, fdmax);
for (i = 0; i < interface_max_connections; i++) {
if (interfaces[i].fd >= 0 && !interfaces[i].expired
&& !interfaces[i].deferred_send) {
FD_SET(interfaces[i].fd, fds);
if (*fdmax < interfaces[i].fd)
*fdmax = interfaces[i].fd;
}
}
}
static void addInterfacesForBufferFlushToFdSet(fd_set * fds, int *fdmax)
{
int i;
FD_ZERO(fds);
for (i = 0; i < interface_max_connections; i++) {
if (interfaces[i].fd >= 0 && !interfaces[i].expired
&& interfaces[i].deferred_send) {
FD_SET(interfaces[i].fd, fds);
if (*fdmax < interfaces[i].fd)
*fdmax = interfaces[i].fd;
}
}
}
static void closeNextErroredInterface(void)
{
fd_set fds;
struct timeval tv;
int i;
tv.tv_sec = 0;
tv.tv_usec = 0;
for (i = 0; i < interface_max_connections; i++) {
if (interfaces[i].fd >= 0) {
FD_ZERO(&fds);
FD_SET(interfaces[i].fd, &fds);
if (select(FD_SETSIZE, &fds, NULL, NULL, &tv) < 0) {
closeInterface(&interfaces[i]);
return;
}
}
}
}
int doIOForInterfaces(void)
{
fd_set rfds;
fd_set wfds;
struct timeval tv;
int i;
int selret;
int fdmax;
tv.tv_sec = 1;
tv.tv_usec = 0;
while (1) {
fdmax = 0;
addInterfacesReadyToReadAndListenSocketToFdSet(&rfds, &fdmax);
addInterfacesForBufferFlushToFdSet(&wfds, &fdmax);
selret = select(fdmax + 1, &rfds, &wfds, NULL, &tv);
if (selret == 0 || (selret < 0 && errno == EINTR))
break;
if (selret < 0) {
closeNextErroredInterface();
continue;
}
getConnections(&rfds);
for (i = 0; i < interface_max_connections; i++) {
if (interfaces[i].fd >= 0
&& FD_ISSET(interfaces[i].fd, &rfds)) {
if (COMMAND_RETURN_KILL ==
interfaceReadInput(&(interfaces[i]))) {
return COMMAND_RETURN_KILL;
}
interfaces[i].lastTime = time(NULL);
}
if (interfaces[i].fd >= 0
&& FD_ISSET(interfaces[i].fd, &wfds)) {
flushInterfaceBuffer(&interfaces[i]);
interfaces[i].lastTime = time(NULL);
}
}
tv.tv_sec = 0;
tv.tv_usec = 0;
}
return 1;
}
void initInterfaces(void)
{
int i;
char *test;
ConfigParam *param;
param = getConfigParam(CONF_CONN_TIMEOUT);
if (param) {
interface_timeout = strtol(param->value, &test, 10);
if (*test != '\0' || interface_timeout <= 0) {
ERROR("connection timeout \"%s\" is not a positive "
"integer, line %i\n", CONF_CONN_TIMEOUT,
param->line);
exit(EXIT_FAILURE);
}
}
param = getConfigParam(CONF_MAX_CONN);
if (param) {
interface_max_connections = strtol(param->value, &test, 10);
if (*test != '\0' || interface_max_connections <= 0) {
ERROR("max connections \"%s\" is not a positive integer"
", line %i\n", param->value, param->line);
exit(EXIT_FAILURE);
}
} else
interface_max_connections = INTERFACE_MAX_CONNECTIONS_DEFAULT;
param = getConfigParam(CONF_MAX_COMMAND_LIST_SIZE);
if (param) {
interface_max_command_list_size = strtol(param->value,
&test, 10);
if (*test != '\0' || interface_max_command_list_size <= 0) {
ERROR("max command list size \"%s\" is not a positive "
"integer, line %i\n", param->value, param->line);
exit(EXIT_FAILURE);
}
interface_max_command_list_size *= 1024;
}
param = getConfigParam(CONF_MAX_OUTPUT_BUFFER_SIZE);
if (param) {
interface_max_output_buffer_size = strtol(param->value,
&test, 10);
if (*test != '\0' || interface_max_output_buffer_size <= 0) {
ERROR("max output buffer size \"%s\" is not a positive "
"integer, line %i\n", param->value, param->line);
exit(EXIT_FAILURE);
}
interface_max_output_buffer_size *= 1024;
}
interfaces = malloc(sizeof(Interface) * interface_max_connections);
list_cache = calloc(interface_list_cache_size, sizeof(struct strnode));
list_cache_head = &(list_cache[0]);
list_cache_tail = &(list_cache[interface_list_cache_size - 1]);
for (i = 0; i < interface_max_connections; i++) {
interfaces[i].fd = -1;
interfaces[i].send_buf = NULL;
interfaces[i].send_buf_size = 0;
interfaces[i].send_buf_alloc = 0;
interfaces[i].num = i;
}
}
static void closeAllInterfaces(void)
{
int i;
for (i = 0; i < interface_max_connections; i++) {
if (interfaces[i].fd > 0)
closeInterface(&(interfaces[i]));
if (interfaces[i].send_buf)
free(interfaces[i].send_buf);
}
free(list_cache);
}
void freeAllInterfaces(void)
{
closeAllInterfaces();
free(interfaces);
interface_max_connections = 0;
}
void closeOldInterfaces(void)
{
int i;
for (i = 0; i < interface_max_connections; i++) {
if (interfaces[i].fd > 0) {
if (interfaces[i].expired) {
DEBUG("interface %i: expired\n", i);
closeInterface(&(interfaces[i]));
} else if (time(NULL) - interfaces[i].lastTime >
interface_timeout) {
DEBUG("interface %i: timeout\n", i);
closeInterface(&(interfaces[i]));
}
}
}
}
static void flushInterfaceBuffer(Interface * interface)
{
struct sllnode *buf;
int ret = 0;
buf = interface->deferred_send;
while (buf) {
ret = write(interface->fd, buf->data, buf->size);
if (ret < 0)
break;
else if (ret < buf->size) {
interface->deferred_bytes -= ret;
buf->data = (char *)buf->data + ret;
buf->size -= ret;
} else {
struct sllnode *tmp = buf;
interface->deferred_bytes -= (buf->size +
sizeof(struct sllnode));
buf = buf->next;
free(tmp);
interface->deferred_send = buf;
}
interface->lastTime = time(NULL);
}
if (!interface->deferred_send) {
DEBUG("interface %i: buffer empty %i\n", interface->num,
interface->deferred_bytes);
assert(interface->deferred_bytes == 0);
} else if (ret < 0 && errno != EAGAIN && errno != EINTR) {
/* cause interface to close */
DEBUG("interface %i: problems flushing buffer\n",
interface->num);
buf = interface->deferred_send;
do {
struct sllnode *prev = buf;
buf = buf->next;
free(prev);
} while (buf);
interface->deferred_send = NULL;
interface->deferred_bytes = 0;
interface->expired = 1;
}
}
int interfacePrintWithFD(int fd, char *buffer, int buflen)
{
static int i = 0;
int copylen;
Interface *interface;
assert(fd > 0);
if (i >= interface_max_connections ||
interfaces[i].fd < 0 || interfaces[i].fd != fd) {
for (i = 0; i < interface_max_connections; i++) {
if (interfaces[i].fd == fd)
break;
}
if (i == interface_max_connections)
return -1;
}
/* if fd isn't found or interfaces is going to be closed, do nothing */
if (interfaces[i].expired)
return 0;
interface = interfaces + i;
while (buflen > 0 && !interface->expired) {
int left = interface->send_buf_size - interface->send_buf_used;
copylen = buflen > left ? left : buflen;
memcpy(interface->send_buf + interface->send_buf_used, buffer,
copylen);
buflen -= copylen;
interface->send_buf_used += copylen;
buffer += copylen;
if (interface->send_buf_used >= interface->send_buf_size)
printInterfaceOutBuffer(interface);
}
return 0;
}
static void printInterfaceOutBuffer(Interface * interface)
{
int ret;
struct sllnode *buf;
if (interface->fd < 0 || interface->expired ||
!interface->send_buf_used)
return;
if ((buf = interface->deferred_send)) {
interface->deferred_bytes += sizeof(struct sllnode)
+ interface->send_buf_used;
if (interface->deferred_bytes >
interface_max_output_buffer_size) {
ERROR("interface %i: output buffer size (%li) is "
"larger than the max (%li)\n",
interface->num,
(long)interface->deferred_bytes,
(long)interface_max_output_buffer_size);
/* cause interface to close */
interface->expired = 1;
do {
struct sllnode *prev = buf;
buf = buf->next;
free(prev);
} while (buf);
interface->deferred_send = NULL;
interface->deferred_bytes = 0;
} else {
while (buf->next)
buf = buf->next;
buf->next = new_sllnode(interface->send_buf,
interface->send_buf_used);
}
} else {
if ((ret = write(interface->fd, interface->send_buf,
interface->send_buf_used)) < 0) {
if (errno == EAGAIN || errno == EINTR) {
interface->deferred_send =
new_sllnode(interface->send_buf,
interface->send_buf_used);
} else {
DEBUG("interface %i: problems writing\n",
interface->num);
interface->expired = 1;
return;
}
} else if (ret < interface->send_buf_used) {
interface->deferred_send =
new_sllnode(interface->send_buf + ret,
interface->send_buf_used - ret);
}
if (interface->deferred_send) {
DEBUG("interface %i: buffer created\n", interface->num);
interface->deferred_bytes =
interface->deferred_send->size
+ sizeof(struct sllnode);
}
}
interface->send_buf_used = 0;
}