snac2/xs_socket.h

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/* copyright (c) 2022 - 2023 grunfink et al. / MIT license */
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#ifndef _XS_SOCKET_H
#define _XS_SOCKET_H
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int xs_socket_timeout(int s, double rto, double sto);
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int xs_socket_server(const char *addr, int port);
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FILE *xs_socket_accept(int rs);
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xs_str *xs_socket_peername(int s);
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#ifdef XS_IMPLEMENTATION
#include <sys/socket.h>
#include <netdb.h>
#include <netinet/in.h>
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#include <arpa/inet.h>
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int xs_socket_timeout(int s, double rto, double sto)
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/* sets the socket timeout in seconds */
{
struct timeval tv;
int ret = 0;
if (rto > 0.0) {
tv.tv_sec = (int)rto;
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tv.tv_usec = (int)((rto - (double)(int)rto) * 1000000.0);
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ret = setsockopt(s, SOL_SOCKET, SO_RCVTIMEO, (char *)&tv, sizeof(tv));
}
if (sto > 0.0) {
tv.tv_sec = (int)sto;
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tv.tv_usec = (int)((sto - (double)(int)sto) * 1000000.0);
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ret = setsockopt(s, SOL_SOCKET, SO_SNDTIMEO, (char *)&tv, sizeof(tv));
}
return ret;
}
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int xs_socket_server(const char *addr, int port)
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/* opens a server socket */
{
int rs = -1;
struct sockaddr_in host;
memset(&host, '\0', sizeof(host));
if (addr != NULL) {
struct hostent *he;
if ((he = gethostbyname(addr)) != NULL)
memcpy(&host.sin_addr, he->h_addr_list[0], he->h_length);
else
goto end;
}
host.sin_family = AF_INET;
host.sin_port = htons(port);
if ((rs = socket(AF_INET, SOCK_STREAM, 0)) != -1) {
/* reuse addr */
int i = 1;
setsockopt(rs, SOL_SOCKET, SO_REUSEADDR, (char *)&i, sizeof(i));
if (bind(rs, (struct sockaddr *)&host, sizeof(host)) == -1) {
close(rs);
rs = -1;
}
else
listen(rs, SOMAXCONN);
}
end:
return rs;
}
FILE *xs_socket_accept(int rs)
/* accepts an incoming connection */
{
int cs = -1;
struct sockaddr_storage addr;
socklen_t l = sizeof(addr);
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cs = accept(rs, (struct sockaddr *)&addr, &l);
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return cs == -1 ? NULL : fdopen(cs, "r+");
}
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xs_str *xs_socket_peername(int s)
/* returns the remote address as a string */
{
xs_str *ip = NULL;
struct sockaddr_storage addr;
socklen_t slen = sizeof(addr);
if (getpeername(s, (struct sockaddr *)&addr, &slen) != -1) {
char buf[1024];
const char *p = NULL;
if (addr.ss_family == AF_INET) {
struct sockaddr_in *sa = (struct sockaddr_in *)&addr;
p = inet_ntop(AF_INET, &sa->sin_addr, buf, sizeof(buf));
}
else
if (addr.ss_family == AF_INET6) {
struct sockaddr_in6 *sa = (struct sockaddr_in6 *)&addr;
p = inet_ntop(AF_INET6, &sa->sin6_addr, buf, sizeof(buf));
}
if (p != NULL)
ip = xs_str_new(p);
}
return ip;
}
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#endif /* XS_IMPLEMENTATION */
#endif /* _XS_SOCKET_H */