diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/ipcalc.c | 58 |
1 files changed, 44 insertions, 14 deletions
diff --git a/src/ipcalc.c b/src/ipcalc.c index 5640d8c3..2535bb6b 100644 --- a/src/ipcalc.c +++ b/src/ipcalc.c @@ -3,18 +3,24 @@ #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> +#include <netdb.h> typedef unsigned int int32; int main(int argc, char ** argv) { - int showBroadcast = 0, showNetwork = 0; + int showBroadcast = 0, showNetwork = 0, showHostname = 0; + int beSilent = 0; int rc; poptContext optCon; char * ipStr, * netmaskStr, * chptr; int32 ip, netmask, network, broadcast; + struct hostent * hostinfo; + char errBuf[250]; struct poptOption optionsTable[] = { { "broadcast", '\0', 0, &showBroadcast, 0 }, + { "hostname", '\0', 0, &showHostname, 0 }, { "network", '\0', 0, &showNetwork, 0 }, + { "silent", '\0', 0, &beSilent, 0 }, { NULL, '\0', 0, 0, 0 }, }; @@ -22,38 +28,47 @@ int main(int argc, char ** argv) { poptReadDefaultConfig(optCon, 1); if ((rc = poptGetNextOpt(optCon)) < -1) { - fprintf(stderr, "ipcalc: bad argument %s: %s\n", - poptBadOption(optCon, POPT_BADOPTION_NOALIAS), - poptStrerror(rc)); + if (!beSilent) + fprintf(stderr, "ipcalc: bad argument %s: %s\n", + poptBadOption(optCon, POPT_BADOPTION_NOALIAS), + poptStrerror(rc)); return 1; } if (!(ipStr = poptGetArg(optCon))) { - fprintf(stderr, "ipcalc: ip address expected\n"); + if (!beSilent) + fprintf(stderr, "ipcalc: ip address expected\n"); return 1; } - if (!(netmaskStr = poptGetArg(optCon))) { - fprintf(stderr, "ipcalc: netmask expected\n"); - return 1; + if (showBroadcast || showNetwork) { + if (!(netmaskStr = poptGetArg(optCon))) { + if (!beSilent) + fprintf(stderr, "ipcalc: netmask expected\n"); + return 1; + } + + if (!inet_aton(netmaskStr, (struct in_addr *) &netmask)) { + if (!beSilent) + fprintf(stderr, "ipcalc: bad netmask: %s\n", netmaskStr); + return 1; + } } if ((chptr = poptGetArg(optCon))) { - fprintf(stderr, "ipcalc: unexpected argument: %s\n", chptr); + if (!beSilent) + fprintf(stderr, "ipcalc: unexpected argument: %s\n", chptr); return 1; } poptFreeContext(optCon); if (!inet_aton(ipStr, (struct in_addr *) &ip)) { - fprintf(stderr, "ipcalc: bad ip address: %s\n", ipStr); + if (!beSilent) + fprintf(stderr, "ipcalc: bad ip address: %s\n", ipStr); return 1; } - if (!inet_aton(netmaskStr, (struct in_addr *) &netmask)) { - fprintf(stderr, "ipcalc: bad netmask: %s\n", netmaskStr); - return 1; - } if (showBroadcast) { broadcast = (ip & netmask) | ~netmask; @@ -65,5 +80,20 @@ int main(int argc, char ** argv) { printf("NETWORK=%s\n", inet_ntoa(*((struct in_addr *) &network))); } + if (showHostname) { + hostinfo = gethostbyaddr((char *) &ip, sizeof(ip), AF_INET); + if (!hostinfo) { + if (!beSilent) { + sprintf(errBuf, "ipcalc: cannot find hostname for %s", ipStr); + herror(errBuf); + } + + return 1; + } + + printf("HOSTNAME=%s\n", hostinfo->h_name); + } + + return 0; } |