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/get_socket_opts.c

Created May 7, 2013 03:55
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get_socket_opts.c
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/tcp.h>
#include <netinet/in.h>
#include <unistd.h>
#include <arpa/inet.h>
union val {
int i_val;
long l_val;
struct linger linger_val;
struct timeval timeval_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);
struct sock_opts {
const char *opt_str;
int opt_level;
int opt_name;
char *(*opt_val_str)(union val *, int);
} sock_opts[] = {
{ "SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, sock_str_flag },
{ "SO_DEBUG", SOL_SOCKET, SO_DEBUG, sock_str_flag },
{ "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_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_TYPE", SOL_SOCKET, SO_TYPE, sock_str_int },
#ifdef SO_USELOOPBACK
{ "SO_USELOOPBACK", SOL_SOCKET, SO_USELOOPBACK, sock_str_flag },
#else
{ "SO_USELOOPBACK", 0, 0, NULL },
#endif
#ifdef IP_TOS
{ "IP_TOS", IPPROTO_IP, IP_TOS, sock_str_int },
#else
{ "IP_TOS", 0, 0, NULL },
#endif
#ifdef IP_TTL
{ "IP_TTL", IPPROTO_IP, IP_TTL, sock_str_int },
#else
{ "IP_TTL", 0, 0, NULL },
#endif
#ifdef IPV6_DONTFRAG
{ "IPV6_DONTFRAG", IPPROTO_IPV6, IPV6_DONTFRAG, sock_str_flag },
#else
{ "IPV6_DONTFRAG", 0, 0, NULL },
#endif
#ifdef IPV6_UNICAST_HOPS
{ "IPV6_UNICAST_HOPS", IPPROTO_IPV6, IPV6_UNICAST_HOPS, sock_str_int },
#else
{ "IPV6_UNICAST_HOPS", 0, 0, NULL },
#endif
#ifdef IPV6_V6ONLY
{ "IPV6_V6ONLY", IPPROTO_IPV6, IPV6_V6ONLY, sock_str_flag },
#else
{ "IPV6_V6ONLY", 0, 0, NULL },
#endif
{ "TCP_MAXSEG", IPPROTO_TCP, TCP_MAXSEG, sock_str_int },
{ "TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, sock_str_flag },
#ifdef SCTP_AUTOCLOSE
{ "SCTP_AUTOCLOSE", IPPROTO_SCTP, SCTP_AUTOCLOSE, sock_str_int },
#else
{ "SCTP_AUTOCLOSE", 0, 0, NULL },
#endif
#ifdef SCTP_MAXBURST
{ "SCTP_MAXBURST", IPPROTO_SCTP, SCTP_MAXBURST, sock_str_int },
#else
{ "SCTP_MAXBURST", 0, 0, NULL },
#endif
#ifdef SCTP_MAXSEG
{ "SCTP_MAXSEG", IPPROTO_SCTP, SCTP_MAXSEG, sock_str_int },
#else
{ "SCTP_MAXSEG", 0, 0, NULL },
#endif
#ifdef SCTP_NODELAY
{ "SCTP_NODELAY", IPPROTO_SCTP, SCTP_NODELAY, sock_str_flag },
#else
{ "SCTP_NODELAY", 0, 0, NULL },
#endif
{ NULL, 0, 0, NULL }
};
/* *INDENT-ON* */
/* end checkopts1 */
/* include checkopts2 */
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 SOL_SOCKET:
case IPPROTO_IP:
case IPPROTO_TCP:
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
default:
printf("Can't create fd for level %d\n", ptr->opt_level);
break;
}
len = sizeof(val);
if (getsockopt(fd, ptr->opt_level, ptr->opt_name,
&val, &len) == -1) {
printf("getsockopt error\n");
} else {
printf("default = %s\n", (*ptr->opt_val_str)(&val, len));
}
close(fd);
}
}
exit(0);
}
/* end checkopts2 */
/* include checkopts3 */
static char strres[128];
static char *
sock_str_flag(union val *ptr, int len) {
/* *INDENT-OFF* */
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);
/* *INDENT-ON* */
}
/* end checkopts3 */
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",
tvptr->tv_sec, tvptr->tv_usec);
return (strres);
}
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