socket.c
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#include <stdio.h> /* for printf() and fprintf() */
#include <sys/socket.h> /* for socket(), bind(), and connect() */
#include <arpa/inet.h> /* for sockaddr_in and inet_ntoa() */
#include <stdlib.h> /* for atoi() and exit() */
#include <string.h> /* for memset() */
#include <unistd.h> /* for close() */
#include <errno.h> /* for errno */
#include <syslog.h>
#include "../include/monitor.h"
extern int verbose;
int initServerSocket(in_port_t port, int backlog) {
int sock; /* socket descriptor for server */
struct sockaddr_in addr; /* Local address */
/* Create socket for incoming connections */
if (-1 == (sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP))) {
syslogMonitor(LOG_ERR, MON_INFO, "server.socket",
"error opening socket: %s - service terminated",
strerror(errno));
exit(EXIT_FAILURE);
}
/* Construct local address structure */
memset(&addr, 0, sizeof(addr)); /* Zero out structure */
addr.sin_family = AF_INET; /* Internet address family */
addr.sin_addr.s_addr = htonl(INADDR_ANY); /* Any incoming interface */
addr.sin_port = htons(port); /* Local port */
/* Bind to the local address */
if (-1 == bind(sock, (struct sockaddr *) &addr, sizeof(addr))) {
syslogMonitor(LOG_ERR, MON_INFO, "server.bind",
"error binding socket: %s - service terminated",
strerror(errno));
exit(EXIT_FAILURE);
}
/* Mark the socket so it will listen for incoming connections */
if (-1 == listen(sock, backlog)) {
syslogMonitor(LOG_ERR, MON_INFO, "server.listen",
"error binding socket: %s - service terminated",
strerror(errno));
exit(EXIT_FAILURE);
}
return sock;
}
int acceptConnection(int servSock, char remoteAddr[16]) {
int sock; /* Socket descriptor for client */
struct sockaddr_in addr; /* Client address */
unsigned int len; /* Length of client address data structure */
/* Set the size of the in-out parameter */
len = sizeof(addr);
/* Wait for a client to connect */
if (-1 == (sock = accept(servSock, (struct sockaddr *) &addr, &len))) {
syslogMonitor(LOG_ERR, MON_INFO, "server.accept",
"error acception connection: %s", strerror(errno));
} else {
strncpy (remoteAddr, inet_ntoa(addr.sin_addr), sizeof(remoteAddr)-1);
}
/* clntSock is connected to a client! */
if (0 != verbose) {
syslog(LOG_INFO, "handling client %s\n", inet_ntoa(addr.sin_addr));
}
return sock;
}