| 1 | #define _GNU_SOURCE |
| 2 | |
| 3 | #include <ctype.h> |
| 4 | #include <errno.h> |
| 5 | #include <limits.h> |
| 6 | #include <stdio.h> |
| 7 | #include <stdlib.h> |
| 8 | #include <string.h> |
| 9 | |
| 10 | #include <getopt.h> |
| 11 | |
| 12 | #include <netdb.h> |
| 13 | |
| 14 | struct nameval { const char *name; int val; }; |
| 15 | const char *prog = "<unset>"; |
| 16 | |
| 17 | static int parseint(const char *s, const char *what) |
| 18 | { |
| 19 | char *q; |
| 20 | unsigned long i; |
| 21 | int e = errno; |
| 22 | |
| 23 | if (!isdigit((unsigned char)*s)) goto fail; |
| 24 | errno = 0; |
| 25 | i = strtoul(s, &q, 0); |
| 26 | if (errno || *q || i > INT_MAX) goto fail; |
| 27 | errno = e; |
| 28 | return ((int)i); |
| 29 | |
| 30 | fail: |
| 31 | fprintf(stderr, "%s: bad numeric %s `%s'\n", prog, what, s); |
| 32 | exit(1); |
| 33 | } |
| 34 | |
| 35 | static int lookup(const char *name, const char *what, |
| 36 | const struct nameval *nv) |
| 37 | { |
| 38 | if (isdigit((unsigned char)*name)) |
| 39 | return (parseint(name, what)); |
| 40 | for (; nv->name; nv++) |
| 41 | if (strcmp(nv->name, name) == 0) return nv->val; |
| 42 | fprintf(stderr, "%s: unknown %s `%s'\n", prog, what, name); |
| 43 | exit(1); |
| 44 | } |
| 45 | |
| 46 | static const char *rlookup(int val, const char *what, |
| 47 | const struct nameval *nv) |
| 48 | { |
| 49 | static char buf[32]; |
| 50 | for (; nv->name; nv++) |
| 51 | if (nv->val == val) return (nv->name); |
| 52 | sprintf(buf, "%s#%d", what, val); |
| 53 | return (buf); |
| 54 | } |
| 55 | |
| 56 | static const struct nameval familymap[] = { |
| 57 | { "unspec", AF_UNSPEC }, |
| 58 | { "inet", AF_INET }, |
| 59 | { "inet6", AF_INET6 }, |
| 60 | { 0 } |
| 61 | }; |
| 62 | |
| 63 | static const struct nameval typemap[] = { |
| 64 | { "any", 0 }, |
| 65 | { "stream", SOCK_STREAM }, |
| 66 | { "dgram", SOCK_DGRAM }, |
| 67 | { "raw", SOCK_RAW }, |
| 68 | { 0 } |
| 69 | }; |
| 70 | |
| 71 | static void usage(FILE *fp) |
| 72 | { |
| 73 | fprintf(fp, |
| 74 | "Usage: %s " |
| 75 | "[-CNacgimnsuv] [-f FAMILY] [-p PROTOCOL] [-t TYPE] " |
| 76 | "NAME [SERVICE]\n", |
| 77 | prog); |
| 78 | } |
| 79 | |
| 80 | static void help(FILE *fp) |
| 81 | { |
| 82 | usage(fp); fputs("\n\ |
| 83 | Options:\n\ |
| 84 | \n\ |
| 85 | -a plain v4 also (with -m) -n numeric host\n\ |
| 86 | -c canonify name -N numeric service\n\ |
| 87 | -C canonify to IDN (with -c) -s allow unassigned codepoints\n\ |
| 88 | -g families with configured addrs -u check result is STD3 hostname\n\ |
| 89 | -i convert to IDN -v passive\n\ |
| 90 | -m v6-mapped v4 addresses\n\ |
| 91 | \n\ |
| 92 | -f unspec|inet|inet6 NAME -- hostname or `-' for none\n\ |
| 93 | -p PROTOCOL -- /etc/protocols SERVICE -- number or /etc/services\n\ |
| 94 | -t any|stream|dgram|raw\n\ |
| 95 | ", fp); |
| 96 | } |
| 97 | |
| 98 | int main(int argc, char *argv[]) |
| 99 | { |
| 100 | struct addrinfo *ai, hint = { .ai_family = AF_UNSPEC }; |
| 101 | const char *name; |
| 102 | const char *serv = 0; |
| 103 | char namebuf[NI_MAXHOST], servbuf[NI_MAXSERV]; |
| 104 | int err; |
| 105 | |
| 106 | prog = strrchr(argv[0], '/'); |
| 107 | if (prog) prog++; |
| 108 | else prog = argv[0]; |
| 109 | |
| 110 | for (;;) { |
| 111 | int opt = getopt(argc, argv, "hf:t:p:nNcvgamiCus"); |
| 112 | if (opt < 0) break; |
| 113 | switch (opt) { |
| 114 | case 'h': help(stdout); exit(0); |
| 115 | case 'f': |
| 116 | hint.ai_family = lookup(optarg, "family", familymap); |
| 117 | break; |
| 118 | case 't': |
| 119 | hint.ai_socktype = lookup(optarg, "type", typemap); |
| 120 | break; |
| 121 | case 'p': |
| 122 | if (isdigit((unsigned char)*optarg)) |
| 123 | hint.ai_protocol = parseint(optarg, "protocol"); |
| 124 | else { |
| 125 | struct protoent *p = getprotobyname(optarg); |
| 126 | if (!p) { |
| 127 | fprintf(stderr, "%s: unknown protocol `%s'\n", prog, optarg); |
| 128 | exit(1); |
| 129 | } |
| 130 | hint.ai_protocol = p->p_proto; |
| 131 | } |
| 132 | break; |
| 133 | case 'C': hint.ai_flags |= AI_CANONIDN; break; |
| 134 | case 'N': hint.ai_flags |= AI_NUMERICSERV; break; |
| 135 | case 'a': hint.ai_flags |= AI_ALL; break; |
| 136 | case 'c': hint.ai_flags |= AI_CANONNAME; break; |
| 137 | case 'g': hint.ai_flags |= AI_ADDRCONFIG; break; |
| 138 | case 'i': hint.ai_flags |= AI_IDN; break; |
| 139 | case 'm': hint.ai_flags |= AI_V4MAPPED; break; |
| 140 | case 'n': hint.ai_flags |= AI_NUMERICHOST; break; |
| 141 | case 's': hint.ai_flags |= AI_IDN_USE_STD3_ASCII_RULES; break; |
| 142 | case 'u': hint.ai_flags |= AI_IDN_ALLOW_UNASSIGNED; break; |
| 143 | case 'v': hint.ai_flags |= AI_PASSIVE; break; |
| 144 | default: usage(stderr); exit(1); |
| 145 | } |
| 146 | } |
| 147 | |
| 148 | argv += optind; |
| 149 | if (!*argv) { usage(stderr); exit(1); } name = *argv++; |
| 150 | if (*argv) { serv = *argv++; } |
| 151 | if (*argv) { usage(stderr); exit(1); } |
| 152 | |
| 153 | if (strcmp(name, "-") == 0) name = 0; |
| 154 | |
| 155 | if ((err = getaddrinfo(name, serv, &hint, &ai)) != 0) { |
| 156 | fprintf(stderr, "%s: %s\n", prog, gai_strerror(err)); |
| 157 | exit(1); |
| 158 | } |
| 159 | |
| 160 | for (; ai; ai = ai->ai_next) { |
| 161 | if (ai->ai_canonname) printf("[%s]\n", ai->ai_canonname); |
| 162 | fputs(rlookup(ai->ai_family, "family", familymap), stdout); |
| 163 | fputc(' ', stdout); |
| 164 | fputs(rlookup(ai->ai_socktype, "type", typemap), stdout); |
| 165 | fputc(' ', stdout); |
| 166 | if ((err = getnameinfo(ai->ai_addr, ai->ai_addrlen, |
| 167 | namebuf, sizeof(namebuf), |
| 168 | servbuf, sizeof(servbuf), |
| 169 | (NI_NUMERICHOST | NI_NUMERICSERV | |
| 170 | (ai->ai_socktype == SOCK_DGRAM ? |
| 171 | NI_DGRAM : 0)))) != 0) |
| 172 | printf("(error: %s)", gai_strerror(err)); |
| 173 | else |
| 174 | printf("%s %s", namebuf, servbuf); |
| 175 | fputc('\n', stdout); |
| 176 | } |
| 177 | |
| 178 | freeaddrinfo(ai); |
| 179 | |
| 180 | return (0); |
| 181 | } |