diff options
Diffstat (limited to 'src/main/c')
-rw-r--r-- | src/main/c/getaddrinfocli.c | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/src/main/c/getaddrinfocli.c b/src/main/c/getaddrinfocli.c new file mode 100644 index 0000000..209a4a6 --- /dev/null +++ b/src/main/c/getaddrinfocli.c @@ -0,0 +1,122 @@ +#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; +} + |