290 lines
6.6 KiB
C
290 lines
6.6 KiB
C
/*****************************************************************************\
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** **
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** Linux Call Router **
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** **
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**---------------------------------------------------------------------------**
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** Copyright: Andreas Eversberg **
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** **
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** Asterisk socket client **
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** **
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\*****************************************************************************/
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/*
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How does it work:
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To connect, open a socket and send a MESSAGE_HELLO to admin socket with
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the application name. This name is unique an can be used for routing calls.
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To make a call, send a MESSAGE_NEWREF and a new reference is received.
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When receiving a call, a new reference is received.
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The reference is received with MESSAGE_NEWREF.
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Make a MESSAGE_SETUP or receive a MESSAGE_SETUP with the reference.
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To release call and reference, send or receive MESSAGE_RELEASE.
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From that point on, the ref is not valid, so no other message may be sent
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with that reference.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdarg.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <time.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include "macro.h"
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#include "extension.h"
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#include "message.h"
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#include "admin.h"
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#include "aserisk_client.h"
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int sock;
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struct admin_list {
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struct admin_list *next;
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struct admin_msg msg;
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} *admin_first = NULL;
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/*
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* enque message from asterisk
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*/
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int send_message(int message_type, unsigned long ref, union parameter *param)
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{
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struct admin_list *admin, **adminp;
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adminp = &admin_first;
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while(*adminp)
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adminp = &((*adminp)->next);
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admin = (struct admin_list *)MALLOC(sizeof(struct admin_list));
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*adminp = admin;
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admin->msg.type = message_type;
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admin->msg.ref = ref;
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memcpy(&admin->msg.param, param, sizeof(union parameter));
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return(0);
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}
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/*
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* message received from LCR
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*/
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int receive_message(int message_type, unsigned long ref, union parameter *param)
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{
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union parameter newparam;
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memset(&newparam, 0, sizeof(union parameter));
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/* handle bchannel message*/
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if (message_type == MESSAGE_BCHANNEL)
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{
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switch(param.bchannel.type)
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{
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case BCHANNEL_ASSIGN:
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if (find_channel_addr(param->bchannel.addr))
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{
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fprintf(stderr, "error: bchannel addr %x already assigned.\n", param->bchannel.addr);
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return(-1);
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}
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/* create channel */
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channel = alloc_channel();
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channel.addr = param->bchannel.addr;
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/* in case, ref is not set, this channel instance must
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* be created until it is removed again by LCR */
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channel.ref = param->bchannel.ref;
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/* link to call */
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if ((call = find_call_ref(param->bchannel.ref)))
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{
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call.addr = param->bchannel.addr;
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}
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#warning open stack
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/* acknowledge */
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newparam.bchannel.type = BCHANNEL_ASSIGN_ACK;
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newparam.bchannel.addr = param->bchannel.addr;
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send_message(MESSAGE_BCHANNEL, 0, &newparam);
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break;
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case BCHANNEL_REMOVE:
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if (!(channel = find_channel_addr(param->bchannel.addr)))
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{
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fprintf(stderr, "error: bchannel addr %x already assigned.\n", param->bchannel.addr);
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return(-1);
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}
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/* unlink from call */
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if ((call = find_call_ref(channel->ref)))
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{
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call.addr = 0;
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}
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/* remove channel */
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free_channel(channel);
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#warning close stack
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/* acknowledge */
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newparam.bchannel.type = BCHANNEL_REMOVE_ACK;
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newparam.bchannel.addr = param->bchannel.addr;
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send_message(MESSAGE_BCHANNEL, 0, &newparam);
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break;
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default:
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fprintf(stderr, "received unknown bchannel message %d\n", param.bchannel.type);
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}
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return(0);
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}
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switch(message_type)
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return(0);
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}
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/* asterisk handler
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* warning! not thread safe
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* returns -1 for socket error, 0 for no work, 1 for work
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*/
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int handle_socket(void)
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{
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int work = 0;
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int len;
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struct admin_message msg;
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struct admin_list *admin;
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/* read from socket */
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len = read(sock, &msg, sizeof(msg));
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if (len == 0)
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{
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printf("Socket closed\n");
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return(-1); // socket closed
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}
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if (len > 0)
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{
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if (len != sizeof(msg))
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{
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fprintf(stderr, "Socket short read (%d)\n", len);
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return(-1); // socket error
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}
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if (msg.message != ADMIN_MESSAGE)
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{
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fprintf(stderr, "Socket received illegal message %d\n", msg.message);
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return(-1); // socket error
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}
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receive_message(msg.type, msg.ref, &msg.param);
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printf("message received %d\n", msg.u.msg.type);
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work = 1;
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} else
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{
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if (errno != EWOULDBLOCK)
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{
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fprintf(stderr, "Socket error %d\n", errno);
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return(-1);
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}
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}
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/* write to socket */
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if (!admin_first)
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return(work);
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admin = admin_first;
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len = write(sock, &admin->msg, sizeof(msg));
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if (len == 0)
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{
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printf("Socket closed\n");
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return(-1); // socket closed
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}
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if (len > 0)
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{
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if (len != sizeof(msg))
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{
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fprintf(stderr, "Socket short write (%d)\n", len);
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return(-1); // socket error
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}
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/* free head */
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admin_first = admin->next;
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FREE(admin, 0);
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work = 1;
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} else
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{
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if (errno != EWOULDBLOCK)
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{
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fprintf(stderr, "Socket error %d\n", errno);
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return(-1);
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}
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}
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return(work);
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}
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/*
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* main function
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*/
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int main(int argc, char *argv[])
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{
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char *socket_name = SOCKET_NAME;
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int conn;
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struct sockaddr_un sock_address;
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int ret;
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unsigned long on = 1;
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union parameter param;
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/* open socket */
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if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
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{
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fprintf(stderr, "Failed to create socket.\n");
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exit(EXIT_FAILURE);
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}
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/* set socket address and name */
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memset(&sock_address, 0, sizeof(sock_address));
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sock_address.sun_family = PF_UNIX;
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UCPY(sock_address.sun_path, socket_name);
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/* connect socket */
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if ((conn = connect(sock, (struct sockaddr *)&sock_address, SUN_LEN(&sock_address))) < 0)
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{
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close(sock);
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fprintf(stderr, "Failed to connect to socket \"%s\".\nIs LCR running?\n", sock_address.sun_path);
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exit(EXIT_FAILURE);
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}
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/* set non-blocking io */
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if (ioctl(sock, FIONBIO, (unsigned char *)(&on)) < 0)
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{
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close(sock);
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fprintf(stderr, "Failed to set socket into non-blocking IO.\n");
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exit(EXIT_FAILURE);
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}
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/* enque hello message */
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memset(¶m, 0, sizeof(param));
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SCPY(param.hello.application, "asterisk");
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admin_asterisk(MESSAGE_HELLO, ¶m);
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while(42)
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{
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ret = handle_socket();
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if (ret < 0)
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break;
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if (!ret)
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usleep(30000);
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}
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/* close socket */
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close(sock);
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/* now we say good bye */
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if (ret)
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{
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printf("%s\n", ret);
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exit(EXIT_FAILURE);
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}
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}
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