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Copy pathsocket.c
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90 lines (79 loc) · 1.64 KB
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#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/socket.h>
#include <net/netlib.h>
#include <netinet/in.h>
#define DEBUG 0
static int _tcp_socket(int protocol);
static int _udp_socket(int protocol);
int socket(int domain, int type, int protocol)
{
#if DEBUG
fprintf(stderr, "socket: domain %d, type %d, protocol %d\n",
domain, type, protocol);
#endif
if (domain != AF_INET)
{
#if DEBUG
fprintf(stderr, "socket: bad domain %d\n", domain);
#endif
errno= EAFNOSUPPORT;
return -1;
}
if (type == SOCK_STREAM)
return _tcp_socket(protocol);
if (type == SOCK_DGRAM)
return _udp_socket(protocol);
#if DEBUG
fprintf(stderr, "socket: nothing for domain %d, type %d, protocol %d\n",
domain, type, protocol);
#endif
errno= EPROTOTYPE;
return -1;
}
static int _tcp_socket(int protocol)
{
int fd;
if (protocol != 0 && protocol != IPPROTO_TCP)
{
#if DEBUG
fprintf(stderr, "socket(tcp): bad protocol %d\n", protocol);
#endif
errno= EPROTONOSUPPORT;
return -1;
}
fd= open(TCP_DEVICE, O_RDWR);
return fd;
}
static int _udp_socket(int protocol)
{
int r, fd, t_errno;
struct sockaddr_in sin;
if (protocol != 0 && protocol != IPPROTO_UDP)
{
#if DEBUG
fprintf(stderr, "socket(udp): bad protocol %d\n", protocol);
#endif
errno= EPROTONOSUPPORT;
return -1;
}
fd= open(UDP_DEVICE, O_RDWR);
if (fd == -1)
return fd;
/* Bind is implict for UDP sockets? */
sin.sin_family= AF_INET;
sin.sin_addr.s_addr= INADDR_ANY;
sin.sin_port= 0;
r= bind(fd, (struct sockaddr *)&sin, sizeof(sin));
if (r != 0)
{
t_errno= errno;
close(fd);
errno= t_errno;
return -1;
}
return fd;
}