From d35747a40c7dea12de95f78a4f283a45ef687597 Mon Sep 17 00:00:00 2001
From: Warren Dukes <warren.dukes@gmail.com>
Date: Mon, 23 Feb 2004 23:41:20 +0000
Subject: import from SF CVS

git-svn-id: https://svn.musicpd.org/mpd/trunk@1 09075e82-0dd4-0310-85a5-a0d7c8717e4f
---
 src/interface.c | 624 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 624 insertions(+)
 create mode 100644 src/interface.c

(limited to 'src/interface.c')

diff --git a/src/interface.c b/src/interface.c
new file mode 100644
index 000000000..66c912f45
--- /dev/null
+++ b/src/interface.c
@@ -0,0 +1,624 @@
+/* the Music Player Daemon (MPD)
+ * (c)2003-2004 by Warren Dukes (shank@mercury.chem.pitt.edu)
+ * 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 "buffer2array.h"
+#include "command.h"
+#include "conf.h"
+#include "list.h"
+#include "log.h"
+#include "listen.h"
+#include "sig_handlers.h"
+#include "playlist.h"
+#include "permission.h"
+
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <sys/time.h>
+#include <sys/param.h>
+#include <sys/select.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <string.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <signal.h>
+
+#define GREETING 		"MPD"
+
+#define INTERFACE_MAX_BUFFER_LENGTH		MAXPATHLEN+1024
+#define INTERFACE_LIST_MODE_BEGIN		"command_list_begin"
+#define INTERFACE_LIST_MODE_END			"command_list_end"
+#define INTERFACE_DEFAULT_OUT_BUFFER_SIZE	4096
+
+int interface_max_connections;
+int interface_timeout;
+unsigned long long interface_max_command_list_size;
+unsigned long long interface_max_output_buffer_size;
+
+typedef struct _Interface {
+	char buffer[INTERFACE_MAX_BUFFER_LENGTH+2];
+	int bufferLength;
+	int fd; /* file descriptor */
+	FILE * fp; /* file pointer */
+	int open; /* open/used */
+	unsigned int permission;
+	time_t lastTime;
+	List * commandList; /* for when in list mode */
+	unsigned long long commandListSize; /* mem commandList consumes */
+	List * bufferList; /* for output if client is slow */
+	unsigned long long outputBufferSize; /* mem bufferList consumes */
+	int expired; /* set whether this interface should be closed on next
+			check of old interfaces */
+	int num; /* interface number */
+	char * outBuffer;
+	int outBuflen;
+	int outBufSize;
+} Interface;
+
+Interface * interfaces = NULL;
+
+void flushInterfaceBuffer(Interface * interface);
+
+void printInterfaceOutBuffer(Interface * interface);
+
+void openInterface(Interface * interface, int fd) {
+	int flags;
+	
+	assert(interface->open==0);
+
+	blockSignals();
+	interface->bufferLength = 0;
+	interface->fd = fd;
+	/* fcntl(interface->fd,F_SETOWN,(int)getpid()); */
+	flags = fcntl(fd,F_GETFL);
+	flags|=O_NONBLOCK;
+	fcntl(interface->fd,F_SETFL,flags);
+	interface->fp = fdopen(fd,"rw");
+	interface->open = 1;
+	interface->lastTime = time(NULL);
+	interface->commandList = NULL;
+	interface->bufferList = NULL;
+	interface->expired = 0;
+	interface->outputBufferSize = 0;
+	interface->outBuflen = 0;
+
+	interface->permission = getDefaultPermissions();
+
+	interface->outBufSize = INTERFACE_DEFAULT_OUT_BUFFER_SIZE;
+#ifdef SO_SNDBUF
+	{
+		int getSize;
+		int sockOptLen = sizeof(int);
+
+		if(getsockopt(interface->fd,SOL_SOCKET,SO_SNDBUF,
+					(char *)&getSize,&sockOptLen) < 0)
+		{
+			DEBUG("problem getting sockets send buffer size\n");
+		}
+		else if(getSize<=0) {
+			DEBUG("sockets send buffer size is not positive\n");
+		}
+		else interface->outBufSize = getSize;
+	}
+#endif
+	interface->outBuffer = malloc(interface->outBufSize);
+	
+	unblockSignals();
+
+	myfprintf(interface->fp,"%s %s %s\n",COMMAND_RESPOND_OK,GREETING,
+			VERSION);
+	printInterfaceOutBuffer(interface);
+}
+
+void closeInterface(Interface * interface) {
+	assert(interface->open);
+
+	interface->open = 0;
+
+	while(fclose(interface->fp) && errno==EINTR);
+
+	if(interface->commandList) freeList(interface->commandList);
+	if(interface->bufferList) freeList(interface->bufferList);
+
+	free(interface->outBuffer);
+
+	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].open;i++);
+
+	if(i==interface_max_connections) {
+		ERROR("Max Connections Reached!\n");
+		while(close(fd) && errno==EINTR);
+	}
+	else {
+		SECURE("interface %i: opened from ",i);
+		switch(addr->sa_family) {
+		case AF_INET:
+			SECURE("%s\n",inet_ntoa(
+					((struct sockaddr_in *)addr)->
+					sin_addr));
+			break;
+#ifdef HAVE_IPV6
+		case AF_INET6:
+			{
+				char host[INET6_ADDRSTRLEN+1];
+				memset(host,0,INET6_ADDRSTRLEN+1);
+				SECURE("%s\n",inet_ntop(AF_INET6,(void *)
+					&(((struct sockaddr_in6 *)addr)->
+					sin6_addr),host,INET6_ADDRSTRLEN));
+			}
+			break;
+#endif
+		case AF_UNIX:
+			SECURE("local connection\n");
+			break;
+		default:
+			SECURE("unknown\n");
+		}
+		openInterface(&(interfaces[i]),fd);
+	}
+}
+
+int interfaceReadInput(Interface * interface) {
+	blockSignals();
+	if(read(interface->fd,interface->buffer+interface->bufferLength,1)>0) {
+		int ret = 1;
+		int bytesRead = 1;
+		while(bytesRead>0) {
+			interface->buffer[interface->bufferLength+1] = '\0';
+			if(interface->buffer[interface->bufferLength]!='\r') {
+				interface->bufferLength++;
+			}
+			if(interface->bufferLength>=INTERFACE_MAX_BUFFER_LENGTH) {
+				break;
+			}
+			if(interface->buffer[interface->bufferLength-1]=='\n') {
+				break;
+			}
+			bytesRead = read(interface->fd,interface->buffer+
+						interface->bufferLength,1);
+		}
+		unblockSignals();
+		if(interface->bufferLength>=INTERFACE_MAX_BUFFER_LENGTH) {
+			ERROR("interface %i: buffer overflow\n",
+				interface->num);
+			closeInterface(interface);
+		}
+		else if(interface->buffer[interface->bufferLength-1]=='\n') {
+			char ** argArray;
+			int argArrayLength;
+
+			interface->buffer[interface->bufferLength-1] = '\0';
+			interface->bufferLength = 0;
+			argArrayLength = buffer2array(interface->buffer,&argArray);
+
+			if(interface->commandList) {
+				if(strcmp(argArray[0],INTERFACE_LIST_MODE_END)==0) {
+					ListNode * node = interface->commandList->firstNode;
+					ret = 0;
+
+					while(node!=NULL) {
+						char ** argArray;
+						int argArrayLength;
+						argArrayLength = buffer2array((char *)node->data,&argArray);
+						DEBUG("interface %i: process command \"%s\"\n",interface->num,node->data);
+						ret = processCommand(interface->fp,&(interface->permission),argArrayLength,argArray);
+						DEBUG("interface %i: command returned %i\n",interface->num,ret);
+						freeArgArray(argArray,argArrayLength);
+						node = node->nextNode;
+						if(ret!=0 || 
+							interface->expired) {
+							node = NULL;
+						}
+					}
+					if(ret==0) {
+						myfprintf(interface->fp,"%s\n",COMMAND_RESPOND_OK);
+					}
+					else if(ret==COMMAND_RETURN_CLOSE ||
+							interface->expired) {
+						closeInterface(interface);
+					}
+					printInterfaceOutBuffer(interface);
+
+					freeList(interface->commandList);
+					interface->commandList = NULL;
+				}
+				else {
+					interface->commandListSize+=sizeof(ListNode);
+					interface->commandListSize+=strlen(interface->buffer)+1;
+					if(interface->commandListSize>interface_max_command_list_size) {
+						ERROR("interface %i: command list size (%lli) is larger than the max (%lli)\n",interface->num,interface->commandListSize,interface_max_command_list_size);
+						closeInterface(interface);
+						
+					}
+					else {
+						insertInListWithoutKey(interface->commandList,strdup(interface->buffer));
+					}
+				}
+			}
+			else {
+				if(strcmp(argArray[0],INTERFACE_LIST_MODE_BEGIN)==0) {
+					interface->commandList = makeList(free);
+					interface->commandListSize = 
+						sizeof(List);
+					ret = 1;
+				}
+				else {
+					if(strcmp(argArray[0],INTERFACE_LIST_MODE_END)==0) {
+						myfprintf(interface->fp,"%s not in command list mode\n",COMMAND_RESPOND_ERROR);
+						ret = -1;
+					}
+					else {
+						DEBUG("interface %i: process command \"%s\"\n",interface->num,interface->buffer);
+						ret = processCommand(interface->fp,&(interface->permission),argArrayLength,argArray);
+						DEBUG("interface %i: command returned %i\n",interface->num,ret);
+					}
+					if(ret==0) {
+						myfprintf(interface->fp,"%s\n",COMMAND_RESPOND_OK);
+					}
+					else if(ret==COMMAND_RETURN_CLOSE ||
+							interface->expired) {
+						closeInterface(interface);
+					}
+					printInterfaceOutBuffer(interface);
+				}
+			}
+			freeArgArray(argArray,argArrayLength);
+		}
+		return ret;
+	}
+	else {
+		unblockSignals();
+		closeInterface(interface);
+	}
+
+	return 1;
+}
+
+void addInterfacesReadyToReadAndListenSocketToFdSet(fd_set * fds, int * fdmax) {
+	int i;
+
+	FD_ZERO(fds);
+	FD_SET(listenSocket,fds);
+	if(*fdmax<listenSocket) *fdmax = listenSocket;
+
+	for(i=0;i<interface_max_connections;i++) {
+		if(interfaces[i].open && !interfaces[i].expired && !interfaces[i].bufferList) {
+			FD_SET(interfaces[i].fd,fds);
+			if(*fdmax<interfaces[i].fd) *fdmax = interfaces[i].fd;
+		}
+	}
+}
+
+void addInterfacesForBufferFlushToFdSet(fd_set * fds, int * fdmax) {
+	int i;
+
+	FD_ZERO(fds);
+
+	for(i=0;i<interface_max_connections;i++) {
+		if(interfaces[i].open && !interfaces[i].expired && interfaces[i].bufferList) {
+			FD_SET(interfaces[i].fd,fds);
+			if(*fdmax<interfaces[i].fd) *fdmax = interfaces[i].fd;
+		}
+	}
+}
+
+void closeNextErroredInterface() {
+	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].open) {
+			FD_ZERO(&fds);
+			FD_SET(interfaces[i].fd,&fds);
+			if(select(FD_SETSIZE,&fds,NULL,NULL,&tv)<0) {
+				closeInterface(&interfaces[i]);
+				return;
+			}
+		}
+	}
+}
+
+int doIOForInterfaces() {
+	fd_set rfds;
+	fd_set wfds;
+	struct timeval tv;
+	int i;
+	int selret;
+	int fdmax = 0;
+
+	tv.tv_sec = 1;
+	tv.tv_usec = 0;
+
+	addInterfacesReadyToReadAndListenSocketToFdSet(&rfds,&fdmax);
+	addInterfacesForBufferFlushToFdSet(&wfds,&fdmax);
+
+	while((selret = select(fdmax+1,&rfds,&wfds,NULL,&tv))) {
+		if(FD_ISSET(listenSocket,&rfds)) getConnections(listenSocket);
+		if(selret<0 && errno==EINTR) break;
+		else if(selret<0) {
+			closeNextErroredInterface();
+			continue;
+		}
+		for(i=0;i<interface_max_connections;i++) {
+			if(interfaces[i].open && 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].open && FD_ISSET(interfaces[i].fd,&wfds)) {
+				flushInterfaceBuffer(&interfaces[i]);
+				interfaces[i].lastTime = time(NULL);
+			}
+		}
+		tv.tv_sec = 0;
+		tv.tv_usec = 0;
+		fdmax = 0;
+		addInterfacesReadyToReadAndListenSocketToFdSet(&rfds,&fdmax);
+		addInterfacesForBufferFlushToFdSet(&wfds,&fdmax);
+	}
+
+	return 1;
+}
+
+void initInterfaces() {
+	int i;
+	char * test;
+
+	interface_timeout = strtol((getConf())[CONF_CONNECTION_TIMEOUT],&test,10);
+	if(*test!='\0' || interface_timeout<=0) {
+		ERROR("connection timeout \"%s\" is not a positive integer\n",(getConf())[CONF_CONNECTION_TIMEOUT]);
+		exit(-1);
+	}
+
+	interface_max_connections = strtol((getConf())[CONF_MAX_CONNECTIONS],&test,10);
+	if(*test!='\0' || interface_max_connections<=0) {
+		ERROR("max connections \"%s\" is not a positive integer\n",(getConf())[CONF_MAX_CONNECTIONS]);
+		exit(-1);
+	}
+
+	interface_max_command_list_size = strtoll((getConf())[CONF_MAX_COMMAND_LIST_SIZE],&test,10);
+	if(*test!='\0' || interface_max_command_list_size<=0) {
+		ERROR("max command list size \"%s\" is not a positive integer\n",(getConf())[CONF_MAX_COMMAND_LIST_SIZE]);
+		exit(-1);
+	}
+
+	interface_max_output_buffer_size = strtoll((getConf())[CONF_MAX_OUTPUT_BUFFER_SIZE],&test,10);
+	if(*test!='\0' || interface_max_output_buffer_size<=0) {
+		ERROR("max output buffer size \"%s\" is not a positive integer\n",(getConf())[CONF_MAX_OUTPUT_BUFFER_SIZE]);
+		exit(-1);
+	}
+
+	interface_max_command_list_size*=1024;
+	interface_max_output_buffer_size*=1024;
+
+	interfaces = malloc(sizeof(Interface)*interface_max_connections);
+
+	for(i=0;i<interface_max_connections;i++) {
+		interfaces[i].open = 0;
+		interfaces[i].num = i;
+	}
+}
+
+void closeAllInterfaces() {
+	int i;
+
+	fflush(NULL);
+
+	for(i=0;i<interface_max_connections;i++) {
+		if(interfaces[i].open) {
+			closeInterface(&(interfaces[i]));
+		}
+	}
+}
+
+void freeAllInterfaces() {
+	closeAllInterfaces();
+
+	free(interfaces);
+}
+
+void closeOldInterfaces() {
+	int i;
+
+	for(i=0;i<interface_max_connections;i++) {
+		if(interfaces[i].open && (interfaces[i].expired || (time(NULL)-interfaces[i].lastTime>interface_timeout))) {
+			DEBUG("interface %i: timeout\n",i);
+			closeInterface(&(interfaces[i]));
+		}
+	}
+}
+
+void closeInterfaceWithFD(int fd) {
+	int i;
+
+	for(i=0;i<interface_max_connections;i++) {
+		if(interfaces[i].fd==fd) {
+			closeInterface(&(interfaces[i]));
+		}
+	}
+}
+
+void flushInterfaceBuffer(Interface * interface) {
+	ListNode * node = NULL;
+	char * str;
+	int ret = 0;
+
+	while((node = interface->bufferList->firstNode)) {
+		str = (char *)node->data;
+		if((ret = write(interface->fd,str,strlen(str)))<0) break;
+		else if(ret<strlen(str)) {
+			interface->outputBufferSize-=ret;
+			str = strdup(&str[ret]);
+			free(node->data);
+			node->data = str;
+		}
+		else {
+			interface->outputBufferSize-= strlen(str)+1;
+			interface->outputBufferSize-= sizeof(ListNode);
+			deleteNodeFromList(interface->bufferList,node);
+		}
+		interface->lastTime = time(NULL);
+	}
+
+	if(!interface->bufferList->firstNode) {
+		DEBUG("interface %i: buffer empty\n",interface->num);
+		freeList(interface->bufferList);
+		interface->bufferList = NULL;
+	}
+	else if(ret<0 && errno!=EAGAIN && errno!=EINTR) {
+		/* cause interface to close */
+		DEBUG("interface %i: problems flushing buffer\n",
+			interface->num);
+		freeList(interface->bufferList);
+		interface->bufferList = NULL;
+		interface->expired = 1;
+	}
+}
+
+void flushAllInterfaceBuffers() {
+	int i;
+
+	for(i=0;i<interface_max_connections;i++) {
+		if(interfaces[i].open && !interfaces[i].expired && interfaces[i].bufferList) {
+			flushInterfaceBuffer(&interfaces[i]);
+		}
+	}
+}
+
+int interfacePrintWithFD(int fd,char * buffer) {
+	int i;
+	int buflen;
+	int copylen;
+	Interface * interface;
+
+	if(!(buflen = strlen(buffer))) return -1;
+
+	for(i=0;i<interface_max_connections;i++) {
+		if(interfaces[i].open && interfaces[i].fd==fd) break;
+	}
+
+	/* if fd isn't found or interfaces is going to be closed, do nothing */
+	if(i==interface_max_connections) return -1;
+	if(interfaces[i].expired) return 0;
+
+	interface = interfaces+i;
+
+	while(buflen>0) {
+		copylen = buflen>
+			interface->outBufSize-interface->outBuflen?
+			interface->outBufSize-interface->outBuflen:
+			buflen;
+		memcpy(interface->outBuffer+interface->outBuflen,buffer,
+			copylen);
+		buflen-=copylen;
+		interface->outBuflen+=copylen;
+		buffer+=copylen;
+		if(interface->outBuflen>=interface->outBufSize) {
+			printInterfaceOutBuffer(interface);
+		}
+	}
+
+	return 0;
+}
+
+void printInterfaceOutBuffer(Interface * interface) {
+	char * buffer;
+	int ret;
+
+	if(!interface->open || interface->expired || !interface->outBuflen) {
+		return;
+	}
+
+	if(interface->bufferList) {
+		interface->outputBufferSize+=sizeof(ListNode);
+		interface->outputBufferSize+=interface->outBuflen+1;
+		if(interface->outputBufferSize>
+				interface_max_output_buffer_size)
+ 		{
+			ERROR("interface %i: output buffer size (%lli) is "
+					"larger than the max (%lli)\n",
+					interface->num,
+					interface->outputBufferSize,
+					interface_max_output_buffer_size);
+			/* cause interface to close */
+			freeList(interface->bufferList);
+			interface->bufferList = NULL;
+			interface->expired = 1;
+		}
+		else {
+			buffer = malloc(interface->outBuflen+1);
+			memcpy(buffer,interface->outBuffer,interface->outBuflen);
+			buffer[interface->outBuflen] = '\0';
+			insertInListWithoutKey(interface->bufferList,(void *)buffer);
+			flushInterfaceBuffer(interface);
+		}
+	}
+	else {
+		if((ret = write(interface->fd,interface->outBuffer,
+				interface->outBuflen))<0) 
+		{
+			if(errno==EAGAIN || errno==EINTR) {
+				buffer = malloc(interface->outBuflen+1);
+				memcpy(buffer,interface->outBuffer,
+						interface->outBuflen);
+				buffer[interface->outBuflen] = '\0';
+				interface->bufferList = makeList(free);
+				insertInListWithoutKey(interface->bufferList,
+						(void *)buffer);
+			}
+			else {
+				DEBUG("interface %i: problems writing\n",
+						interface->num);
+				interface->expired = 1;
+				return;
+			}
+		}
+		else if(ret<interface->outBuflen) {
+			buffer = malloc(interface->outBuflen-ret+1);
+			memcpy(buffer,interface->outBuffer+ret,
+					interface->outBuflen-ret);
+			buffer[interface->outBuflen-ret] = '\0';
+			interface->bufferList = makeList(free);
+			insertInListWithoutKey(interface->bufferList,buffer);
+		}
+		/* if we needed to create buffer, initialize bufferSize info */
+		if(interface->bufferList) {
+			DEBUG("interface %i: buffer created\n",interface->num);
+			interface->outputBufferSize = sizeof(List);
+			interface->outputBufferSize+=sizeof(ListNode);
+			interface->outputBufferSize+=strlen(
+					(char *)interface->bufferList->
+					firstNode->data)+1;
+		}
+	}
+
+	interface->outBuflen = 0;
+}
-- 
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