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/*
Usage: ./addrset [<specification> ...]
This program tests the addrset functions in nbase/nbase_addrset.c,
the ones that maintain the lists of addresses for --allow and
--deny. It takes as arguments specifications that are added to an
addrset. It then reads whitespace-separated host names or IP
addresses from standard input and echoes only those that are in the
addrset.
David Fifield
Example:
$ echo "1.2.3.4 1.0.0.5 1.2.3.8" | ./addrset "1.2.3.10/24"
1.2.3.4
1.2.3.8
*/
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include "ncat_core.h"
#ifdef WIN32
#include "../nsock/src/error.h"
#endif
#ifdef WIN32
static void win_init(void)
{
WSADATA data;
int rc;
rc = WSAStartup(MAKEWORD(2,2), &data);
if (rc)
fatal("failed to start winsock: %s\n", socket_strerror(rc));
}
#endif
static int resolve_name(const char *name, struct addrinfo **result)
{
struct addrinfo hints = { 0 };
hints.ai_protocol = IPPROTO_TCP;
*result = NULL;
return getaddrinfo(name, NULL, &hints, result);
}
int main(int argc, char *argv[])
{
struct addrset *set;
char line[1024];
int i;
#ifdef WIN32
win_init();
#endif
set = addrset_new();
options_init();
for (i = 1; i < argc; i++) {
if (!addrset_add_spec(set, argv[i], o.af, !o.nodns)) {
fprintf(stderr, "Error adding spec \"%s\".\n", argv[i]);
exit(1);
}
}
while (fgets(line, sizeof(line), stdin) != NULL) {
char *s, *hostname;
struct addrinfo *addrs;
s = line;
while ((hostname = strtok(s, " \t\n")) != NULL) {
int rc;
s = NULL;
rc = resolve_name(hostname, &addrs);
if (rc != 0) {
fprintf(stderr, "Error resolving \"%s\": %s.\n", hostname, gai_strerror(rc));
continue;
}
if (addrs == NULL) {
fprintf(stderr, "No addresses found for \"%s\".\n", hostname);
continue;
}
/* Check just the first address returned. */
if (addrset_contains(set, addrs->ai_addr))
printf("%s\n", hostname);
freeaddrinfo(addrs);
}
}
addrset_free(set);
return 0;
}
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