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getsocketopt.c
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//Get socket options- sample for using tcp socket options in C
#include <sys/types.h>
#include <sys/socket.h>
//#include <linux/in6.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <linux/in.h>
#include <stdlib.h>
#include <unistd.h>
//#include <arpa/inet.h>
//#include <netinet/tcp.h> /* for TCP_xxx defines */
#include <linux/tcp.h>
#include <linux/udp.h>
//#include <linux/ip.h>
union val {
int i_val;
long l_val;
struct linger linger_val;
struct timeval timeval_val;
struct tcp_info info_val;
} val;
static char *sock_str_flag(union val *, int);
static char *sock_str_int(union val *, int);
static char *sock_str_linger(union val *, int);
static char *sock_str_timeval(union val *, int);
static char *sock_str_info(union val *, int);
struct sock_opts {
const char *opt_str;
int opt_level;
int opt_name;
char *(*opt_val_str) (union val *, int);
} sock_opts[] = {
// SO_BINDTODEVICE: bind socket to a particular device like "eht0"
// SO_BSDCOMPAT; enable BSD bug-to-bug compatiblity
// SO_PEERCRED: return the credentials of foreign process
// SO_PRIORITY: set the priority for all packets to be sent
// SO_RCVBUFFORCE
// SO_RCVLOWAT
// SO_SNDLOWAT
// SO_RCVTIMEO
// SO_SNDTIMEO
// SO_SNDBUFFORCE
//
{ "SO_ACCEPTCONN", SOL_SOCKET, SO_ACCEPTCONN, sock_str_flag },
{ "SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, sock_str_flag },
{ "SO_DEBUG", SOL_SOCKET, SO_DEBUG, sock_str_flag },
{ "SO_DOMAIN", SOL_SOCKET, SO_DOMAIN, sock_str_int },
{ "SO_DONTROUTE", SOL_SOCKET, SO_DONTROUTE, sock_str_flag },
{ "SO_ERROR", SOL_SOCKET, SO_ERROR, sock_str_int },
{ "SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, sock_str_flag },
{ "SO_LINGER", SOL_SOCKET, SO_LINGER, sock_str_linger },
{ "SO_OOBINLINE", SOL_SOCKET, SO_OOBINLINE, sock_str_flag },
{ "SO_PASSCRED", SOL_SOCKET, SO_PASSCRED, sock_str_flag },
{ "SO_PROTOCOL", SOL_SOCKET, SO_PROTOCOL, sock_str_int },
{ "SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, sock_str_int },
{ "SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, sock_str_int },
{ "SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, sock_str_int },
{ "SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, sock_str_int },
{ "SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, sock_str_timeval },
{ "SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, sock_str_timeval },
{ "SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, sock_str_flag },
#ifdef SO_REUSEPORT
{ "SO_REUSEPORT", SOL_SOCKET, SO_REUSEPORT, sock_str_flag },
#else
{ "SO_REUSEPORT", 0, 0, NULL },
#endif
{ "SO_TIMESTAMP", SOL_SOCKET, SO_TIMESTAMP, sock_str_flag },
{ "SO_TYPE", SOL_SOCKET, SO_TYPE, sock_str_int },
// { "SO_USELOOPBACK", SOL_SOCKET, SO_USELOOPBACK, sock_str_flag },
// IP related options
// IP_ADD_MEMBERSHIP: join a multicast group
// IP_DROP_MEMBERSHIP: leave a multicast group
// IP_HDRINCL: user supplies an IP header
// IP_MTU: retrieve the current known path MTU. only valid when connected
// IP_MTU_DISCOVER: path mtu discovery
// IP_MULTICAST_IF: set the local device for a multicast socket.
// IP_OPTIONS: 40 bytes for IPv4
// IP_PKTINFO: struct in_pktinfo
// IP_RECVOPTS: pass all incoming IP options to the user
// IP_RETOPTS: identical to IP_RECVOPTS, but return raw options
{ "IP_MULTICAST_LOOP", IPPROTO_IP, IP_MULTICAST_LOOP, sock_str_flag },
{ "IP_MULTICAST_TTL", IPPROTO_IP, IP_MULTICAST_TTL, sock_str_int },
{ "IP_NODEFRAG", IPPROTO_IP, IP_NODEFRAG, sock_str_flag },
{ "IP_RECVERR", IPPROTO_IP, IP_RECVERR, sock_str_flag },
{ "IP_RECVTOS", IPPROTO_IP, IP_RECVTOS, sock_str_flag },
{ "IP_RECVTTL", IPPROTO_IP, IP_RECVTTL, sock_str_int },
// { "IP_ROUTER_ALERT", IPPROTO_IP, IP_ROUTER_ALERT, sock_str_flag },
{ "IP_TOS", IPPROTO_IP, IP_TOS, sock_str_int },
{ "IP_TTL", IPPROTO_IP, IP_TTL, sock_str_int },
// { "IPV6_DONTFRAG", IPPROTO_IPV6,IPV6_DONTFRAG, sock_str_flag },
// { "IPV6_UNICAST_HOPS", IPPROTO_IPV6,IPV6_UNICAST_HOPS,sock_str_int },
// { "IPV6_V6ONLY", IPPROTO_IPV6,IPV6_V6ONLY, sock_str_flag },
// TCP related options
{ "TCP_CORK", IPPROTO_TCP, TCP_CORK, sock_str_flag },
{ "TCP_DEFER_ACCEPT", IPPROTO_TCP, TCP_DEFER_ACCEPT, sock_str_flag },
{ "TCP_INFO", IPPROTO_TCP, TCP_INFO, sock_str_info },
{ "TCP_KEEPCNT", IPPROTO_TCP, TCP_KEEPCNT, sock_str_int },
{ "TCP_KEEPIDLE", IPPROTO_TCP, TCP_KEEPIDLE, sock_str_int },
{ "TCP_KEEPINTVL", IPPROTO_TCP, TCP_KEEPINTVL, sock_str_int },
{ "TCP_LINGER2", IPPROTO_TCP, TCP_LINGER2, sock_str_int },
{ "TCP_MAXSEG", IPPROTO_TCP, TCP_MAXSEG, sock_str_int },
{ "TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, sock_str_flag },
{ "TCP_QUICKACK", IPPROTO_TCP, TCP_QUICKACK, sock_str_flag },
{ "TCP_SYNCNT", IPPROTO_TCP, TCP_SYNCNT, sock_str_int },
{ "TCP_WINDOW_CLAMP", IPPROTO_TCP, TCP_WINDOW_CLAMP, sock_str_int },
// UDP related options
{ "UDP_CORK", IPPROTO_UDP, UDP_CORK, sock_str_flag },
{ NULL, 0, 0, NULL }
};
int main(int argc, char **argv) {
int fd;
socklen_t len;
struct sock_opts *ptr;
for (ptr = sock_opts; ptr->opt_str != NULL; ptr++) {
printf("%s: ", ptr->opt_str);
if (ptr->opt_val_str == NULL) {
printf("(undefined)\n");
} else {
switch (ptr->opt_level) {
case IPPROTO_IP:
// fd = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
// break;
case IPPROTO_TCP:
case SOL_SOCKET:
fd = socket(AF_INET, SOCK_STREAM, 0);
break;
#ifdef IPV6
case IPPROTO_IPV6:
fd = socket(AF_INET6, SOCK_STREAM, 0);
break;
#endif
#ifdef IPPROTO_SCTP
case IPPROTO_SCTP:
fd = socket(AF_INET, SOCK_SEQPACKET, IPPROTO_SCTP);
break;
#endif
case IPPROTO_UDP:
fd = socket(AF_INET, SOCK_DGRAM, 0);
break;
default:
printf("Can't create fd for level %d\n", ptr->opt_level);
exit(1);
}
len = sizeof(val);
if (getsockopt(fd, ptr->opt_level, ptr->opt_name, &val, &len) == -1) {
printf("getsockopt error: %s\n", strerror(errno));
return 1;
} else {
printf("default = %s\n", (*ptr->opt_val_str) (&val, len));
}
close(fd);
}
}
exit(0);
}
static char strres[128];
static char *sock_str_flag(union val *ptr, int len) {
if (len != sizeof(int))
snprintf(strres, sizeof(strres), "size (%d) not sizeof(int)", len);
else
snprintf(strres, sizeof(strres), "%s", (ptr->i_val == 0) ? "off" : "on");
return(strres);
}
static char *sock_str_int(union val *ptr, int len) {
if (len != sizeof(int))
snprintf(strres, sizeof(strres), "size (%d) not sizeof(int)", len);
else
snprintf(strres, sizeof(strres), "%d", ptr->i_val);
return(strres);
}
static char *sock_str_linger(union val *ptr, int len) {
struct linger *lptr = &ptr->linger_val;
if (len != sizeof(struct linger))
snprintf(strres, sizeof(strres), "size (%d) not sizeof(struct linger)", len);
else
snprintf(strres, sizeof(strres), "l_onoff = %d, l_linger = %d",
lptr->l_onoff, lptr->l_linger);
return(strres);
}
static char *sock_str_timeval(union val *ptr, int len) {
struct timeval *tvptr = &ptr->timeval_val;
if (len != sizeof(struct timeval))
snprintf(strres, sizeof(strres),
"size (%d) not sizeof(struct timeval)", len);
else
snprintf(strres, sizeof(strres), "%d sec, %d usec",
(int)tvptr->tv_sec, (int)tvptr->tv_usec);
return(strres);
}
static char *sock_str_info(union val *ptr, int len) {
struct tcp_info *tvptr = &ptr->info_val;
if (len != sizeof(struct tcp_info)) {
snprintf(strres, sizeof(strres),
"size (%d) not sizeof(struct tcp_info)", len);
} else {
snprintf(strres, sizeof(strres), "sacked: %d, retrans: %d",
(int)tvptr->tcpi_sacked, (int)tvptr->tcpi_retrans);
}
return(strres);
}