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#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h> /* close() */
#include <sys/types.h> /* AF_INET, SOCK_STREAM */
#include <sys/socket.h> /* socket() */
#include <arpa/inet.h> /* htons(), hotnl() */
#include <netdb.h> /* gethostbyname(), getaddrinfo() */
#include "socket.h"
int sock_connect(const char *host, const char *port)
{
int sd, ret;
// struct sockaddr_in *sa;
struct addrinfo *ai, *ptr;
struct addrinfo hint;
if ((host == NULL) || (*host == 0)) {
return -1;
}
memset(&hint, 0, sizeof(hint));
hint.ai_flags = AI_ADDRCONFIG|AI_NUMERICSERV;
hint.ai_family = AF_INET6;
hint.ai_socktype = SOCK_STREAM;
if ((ret=getaddrinfo(host, port, &hint, &ai)) != 0) {
printf("%s: getaddrinfo returned %i\n", __FUNCTION__, ret);
return -1;
}
for (ptr=ai; ptr != NULL; ptr=ptr->ai_next) {
if ((sd=socket(ptr->ai_family, ptr->ai_socktype, ptr->ai_protocol)) == -1) {
continue;
}
if (connect(sd, ptr->ai_addr, ptr->ai_addrlen) == -1) {
close(sd);
continue;
}
// sa=(struct sockaddr_in *)ptr->ai_addr;
break; /* if we get here, we have connected successfully */
}
if (ptr == NULL) { /* end reached with no connect */
return -1;
}
freeaddrinfo(ai);
return sd;
}
/* --------------------------------------------------------------------
Write to a socket
-------------------------------------------------------------------- */
ssize_t sock_write(int sd, const char *buf, size_t len)
{
ssize_t n, wrlen = 0;
while (len) {
n = write(sd, buf, len);
if (n <= 0)
return -1;
len -= (size_t)n;
wrlen += n;
buf += n;
}
return wrlen;
}
/* --------------------------------------------------------------------
Read a \n terminated line from a socket
-------------------------------------------------------------------- */
ssize_t sock_readln(int sd, char *buf, size_t len)
{
char *newline, *bp = buf;
ssize_t n;
if (--len < 1) {
return -1;
}
do {
/*
* The reason for these gymnastics is that we want two things:
* (1) to read \n-terminated lines,
* (2) to return the true length of data read, even if the
* data coming in has embedded NULs.
*/
if ((n = recv(sd, bp, len, MSG_PEEK)) <= 0) {
return -1;
}
if ((newline = memchr(bp, '\n', (size_t)n)) != NULL) {
n = newline - bp + 1;
}
if ((n = read(sd, bp, n)) == -1) {
return -1;
}
bp += n;
len -= n;
} while (!newline && len);
*bp = '\0';
return bp - buf;
}
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