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#ifdef USERCONFIG
USERCONFIG
#endif
#include <arpa/inet.h>
#include <assert.h>
#include <errno.h>
#include <netdb.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#define STR_QUOT_(S) #S
#define STR_QUOT(S) STR_QUOT_(S)
static void printHelp( void ){
printf("%s%s%s", " \n"
" ", strrchr(__FILE__,'/')+1, " - " STR_QUOT(PROJECT_VERSION) "\n"
" \n"
" Print result of getaddrinfo [1] to stdout.\n"
" \n"
" Example: getaddrinfo example.com\n"
" \n"
" [1]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getaddrinfo.html\n"
" \n"
);
}
int main( int argc, char**argv ){
int err;
const char *nodename;
struct addrinfo *res = NULL, *it;
if( argc != 2 ){ fprintf(stderr, "EINVAL: Try --help\n"); err = -1; goto endFn; }
if( !strcmp(argv[1], "--help") ){ printHelp(); err = 0; goto endFn; }
nodename = argv[1]; assert(nodename != NULL);
err = getaddrinfo(nodename, NULL, NULL, &res);
if( err != 0 ){
const char *ex;
switch( err ){
case EAI_AGAIN: ex = "EAI_AGAIN"; break;
case EAI_BADFLAGS: ex = "EAI_BADFLAGS"; break;
case EAI_FAIL: ex = "EAI_FAIL"; break;
case EAI_FAMILY: ex = "EAI_FAMILY"; break;
case EAI_MEMORY: ex = "EAI_MEMORY"; break;
case EAI_NONAME: ex = "EAI_NONAME"; break;
case EAI_SERVICE: ex = "EAI_SERVICE"; break;
case EAI_SOCKTYPE: ex = "EAI_SOCKTYPE"; break;
case EAI_SYSTEM: ex = "EAI_SYSTEM"; break;
#ifdef EAI_ADDRFAMILY
case EAI_ADDRFAMILY: ex = "EAI_ADDRFAMILY"; break;
#endif
#ifdef EAI_NODATA
case EAI_NODATA: ex = "EAI_NODATA"; break;
#endif
default:
assert(!fprintf(stderr,"ERROR: getaddrinfo(): %d %s:%d\n", err, __FILE__, __LINE__));
ex = NULL;
}
printf("%s: getaddrinfo(\"%s\")\n", ex, nodename);
err = -1; goto endFn;
}
printf("C: %-6s %-6s %-5s %-4s %s\n", "AF", "SOCK", "PROTO", "FLGS", "ADDR");
for( it = res ; it != NULL ; it = it->ai_next ){
const char *afStr, *typStr, *protoStr;
switch( it->ai_family ){
case AF_UNIX : afStr = "UNIX" ; break;
case AF_INET : afStr = "INET" ; break;
case AF_INET6 : afStr = "INET6" ; break;
case AF_UNSPEC: afStr = "UNSPEC"; break;
default: assert(!fprintf(stderr,"TODO: ai_family %d\n", it->ai_family)); afStr = NULL;
}
switch( it->ai_socktype ){
case SOCK_STREAM: typStr = "STREAM"; break;
case SOCK_DGRAM : typStr = "DGRAM" ; break;
case SOCK_RAW : typStr = "RAW" ; break;
default: assert(!fprintf(stderr, "TODO: ai_socktype %d\n", it->ai_socktype)); typStr = NULL;
}
switch( it->ai_protocol ){
case 0: protoStr = "0"; break;
case IPPROTO_TCP: protoStr = "TCP"; break;
case IPPROTO_UDP: protoStr = "UDP"; break;
default: assert(!fprintf(stderr, "TODO: ai_protocol %d\n", it->ai_protocol)); protoStr = NULL;
}
printf("R: %-6s %-6s %-5s 0x%02X",
afStr,
typStr,
protoStr,
it->ai_flags
);
switch( it->ai_family ){
case AF_UNIX: /*TODO anything useful to print here?*/ break;
case AF_INET: {
#define ADDR4 ((struct sockaddr_in*)it->ai_addr)
uint_least32_t ip;
assert(it->ai_addrlen == 16);
assert(ADDR4->sin_family == AF_INET);
ip = ntohl(ADDR4->sin_addr.s_addr);
printf(" %d.%d.%d.%d", ip >> 24 & 0xFF, ip >> 16 & 0xFF, ip >> 8 & 0xFF, ip & 0xFF);
break; }
#undef ADDR4
case AF_INET6: {
#define ADDR6 ((struct sockaddr_in6*)it->ai_addr)
char buf[INET6_ADDRSTRLEN + 1];
if( inet_ntop(it->ai_family, &ADDR6->sin6_addr, buf, sizeof buf) == NULL ){
snprintf(buf, sizeof buf, "inet_ntop(): errno=%d", errno);
}
printf(" %s", buf);
break; }
#undef ADDR6
default: assert(!fprintf(stderr,"TODO: ai_family %d\n", it->ai_family));
}
if( it->ai_canonname != NULL ) printf(" cn=\"%s\"", it->ai_canonname);
puts("");
}
err = 0;
endFn:
if( res != NULL ) freeaddrinfo(res);
return !!err;
}
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