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sock.c
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sock.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <unistd.h>
#include <errno.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/select.h>
#include <netdb.h>
#include <ctype.h>
#include "sock.h"
int skgetc(int *sd)
{
int c = 0;
int r = recv(*sd, (char *) &c, 1, 0);
if(r == 0 || r == -1) {
socket_debug("[%05d] EOF received.\n", *sd);
c = EOF;
}
socket_info("[recv.%05d] 0x%02x '%c'\n", *sd, isprint(c) ? c : '0');
return c;
}
int skgets(char *buf, int max, int *sd)
{
int c, len = 0;
while((c = skgetc(sd)) != '\n' && c != EOF && len < max) {
if(c != '\r') {
*buf++ = (char) c;
++len;
}
}
*buf = 0;
socket_info("[read.%05d] size=%d, max=%d, \"%s\"\n", *sd,len,max,buf);
return len;
}
int skputs(char *buf, int *sd)
{
int i, k, size = strlen(buf);
k = size;
while(size > 0) {
socket_info("[write.%05d] \"%s\"\n", *sd, buf);
i = send(*sd, buf, size, 0);
if(i == -1) {
socket_debug("[%05d] Bad write: %s\n", *sd,
strerror(errno));
return i;
}
size -= i;
buf += i;
}
return k;
}
int skwrite(int *sd, void *buf, int size)
{
socket_info("[write.%05d] Sending %02d bytes\n", *sd, size);
return send(*sd, buf, size, 0);
}
int skprintf(int *sd, char *fmt, ...)
{
va_list ap;
char buf[0x801];
socket_info("[write.%05d] skprintf: WARNING: NOT THREAD SAFE!\n", *sd);
va_start(ap, fmt);
vsprintf(buf, fmt, ap);
va_end(ap);
return skputs(buf, sd);
}
int *skbind(short port)
{
int *sd = NULL;
int yes = 1;
struct sockaddr_in addr;
sd = calloc(sizeof(int), 1);
if(sd == NULL) {
socket_debug("Out of Memory\n");
return NULL;
}
memset(&addr, 0, sizeof(struct sockaddr_in));
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
if((*sd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
socket_debug("Could not create socket: %s\n", strerror(errno));
free(sd);
return NULL;
}
if(setsockopt(*sd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) == -1) {
socket_debug("[setsockopt.%05d] Failed: %s\n", *sd,
strerror(errno));
skclose(sd);
return NULL;
}
if(bind(*sd, (struct sockaddr *) &addr,
sizeof(struct sockaddr_in)) == -1) {
socket_debug("[bind.%05d] Failed: %s\n", *sd,
strerror(errno));
skclose(sd);
return NULL;
}
return sd;
}
int *skconnect(char *remote, short port)
{
int *sd;
struct sockaddr_in addr;
struct hostent *host;
sd = skbind(0);
if(sd == NULL)
return NULL;
if((host = gethostbyname(remote)) == NULL) {
free(sd);
return NULL;
}
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
memcpy(&addr.sin_addr, host->h_addr_list[0], host->h_length);
if(connect(*sd, (struct sockaddr *) &addr,
sizeof(struct sockaddr_in)) == -1) {
skclose(sd);
sd = NULL;
}
return sd;
}
int *sklisten(short port, int backlog)
{
int *sd = skbind(port);
if(sd) {
if(listen(*sd, backlog) < 0) {
skclose(sd);
sd = NULL;
}
}
return sd;
}
int *skaccept(int *sd)
{
int *c_sd = calloc(sizeof(int), 1);
if(c_sd) {
if((*c_sd = accept(*sd, NULL, NULL)) < 0) {
free(c_sd);
c_sd = NULL;
}
}
return c_sd;
}
void skclose(int *sd)
{
if(sd) {
close(*sd);
shutdown(*sd, 2);
free(sd);
}
}