/* vi: set sw=4 ts=4 ai: */ /* * Mini ipcalc implementation for busybox * * By Jordan Crouse <jordan@cosmicpenguin.net> * Stephan Linz <linz@li-pro.net> * * This is a complete reimplementation of the ipcalc program * from Red Hat. I didn't look at their source code, but there * is no denying that this is a loving reimplementation */ #include <stdio.h> #include <stdlib.h> #include <ctype.h> #include <getopt.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #include "busybox.h" #define IPCALC_MSG(CMD,ALTCMD) if (mode & SILENT) {ALTCMD;} else {CMD;} #define CLASS_A_NETMASK ntohl(0xFF000000) #define CLASS_B_NETMASK ntohl(0xFFFF0000) #define CLASS_C_NETMASK ntohl(0xFFFFFF00) static unsigned long get_netmask(unsigned long ipaddr) { ipaddr = htonl(ipaddr); if ((ipaddr & 0xC0000000) == 0xC0000000) return CLASS_C_NETMASK; else if ((ipaddr & 0x80000000) == 0x80000000) return CLASS_B_NETMASK; else if ((ipaddr & 0x80000000) == 0) return CLASS_A_NETMASK; else return 0; } #ifdef CONFIG_FEATURE_IPCALC_FANCY static int get_prefix(unsigned long netmask) { unsigned long msk = 0x80000000; int ret = 0; netmask = htonl(netmask); while(msk) { if (netmask & msk) ret++; msk >>= 1; } return ret; } #endif #define NETMASK 0x01 #define BROADCAST 0x02 #define NETWORK 0x04 #define NETPREFIX 0x08 #define HOSTNAME 0x10 #define SILENT 0x20 int ipcalc_main(int argc, char **argv) { unsigned long mode; unsigned long netmask; unsigned long broadcast; unsigned long network; unsigned long ipaddr; struct in_addr a; #ifdef CONFIG_FEATURE_IPCALC_FANCY unsigned long netprefix = 0; int have_netmask = 0; char *ipstr, *prefixstr; #endif static const struct option long_options[] = { {"netmask", no_argument, NULL, 'm'}, {"broadcast", no_argument, NULL, 'b'}, {"network", no_argument, NULL, 'n'}, #ifdef CONFIG_FEATURE_IPCALC_FANCY {"prefix", no_argument, NULL, 'p'}, {"hostname", no_argument, NULL, 'h'}, {"silent", no_argument, NULL, 's'}, #endif {NULL, 0, NULL, 0} }; bb_applet_long_options = long_options; mode = bb_getopt_ulflags(argc, argv, #ifdef CONFIG_FEATURE_IPCALC_FANCY "mbnphs" #else "mbn" #endif ); if (mode & (BROADCAST | NETWORK | NETPREFIX)) { if (argc - optind > 2) { bb_show_usage(); } } else { if (argc - optind != 1) { bb_show_usage(); } } #ifdef CONFIG_FEATURE_IPCALC_FANCY prefixstr = ipstr = argv[optind]; while(*prefixstr) { if (*prefixstr == '/') { *prefixstr = (char)0; prefixstr++; if (*prefixstr) { unsigned int msk; if (safe_strtoul(prefixstr, &netprefix) || netprefix > 32) { IPCALC_MSG(bb_error_msg_and_die("bad IP prefix: %s\n", prefixstr), exit(EXIT_FAILURE)); } netmask = 0; msk = 0x80000000; while (netprefix > 0) { netmask |= msk; msk >>= 1; netprefix--; } netmask = htonl(netmask); /* Even if it was 0, we will signify that we have a netmask. This allows */ /* for specification of default routes, etc which have a 0 netmask/prefix */ have_netmask = 1; } break; } prefixstr++; } ipaddr = inet_aton(ipstr, &a); #else ipaddr = inet_aton(argv[optind], &a); #endif if (ipaddr == 0) { IPCALC_MSG(bb_error_msg_and_die("bad IP address: %s", argv[optind]), exit(EXIT_FAILURE)); } ipaddr = a.s_addr; if (argc - optind == 2) { #ifdef CONFIG_FEATURE_IPCALC_FANCY if (have_netmask) { IPCALC_MSG(bb_error_msg_and_die("Both prefix and netmask were specified, use one or the other.\n"), exit(EXIT_FAILURE)); } #endif netmask = inet_aton(argv[optind + 1], &a); if (netmask == 0) { IPCALC_MSG(bb_error_msg_and_die("bad netmask: %s", argv[optind + 1]), exit(EXIT_FAILURE)); } netmask = a.s_addr; } else { #ifdef CONFIG_FEATURE_IPCALC_FANCY if (!have_netmask) #endif /* JHC - If the netmask wasn't provided then calculate it */ netmask = get_netmask(ipaddr); } if (mode & NETMASK) { printf("NETMASK=%s\n", inet_ntoa((*(struct in_addr *) &netmask))); } if (mode & BROADCAST) { broadcast = (ipaddr & netmask) | ~netmask; printf("BROADCAST=%s\n", inet_ntoa((*(struct in_addr *) &broadcast))); } if (mode & NETWORK) { network = ipaddr & netmask; printf("NETWORK=%s\n", inet_ntoa((*(struct in_addr *) &network))); } #ifdef CONFIG_FEATURE_IPCALC_FANCY if (mode & NETPREFIX) { printf("PREFIX=%i\n", get_prefix(netmask)); } if (mode & HOSTNAME) { struct hostent *hostinfo; int x; hostinfo = gethostbyaddr((char *) &ipaddr, sizeof(ipaddr), AF_INET); if (!hostinfo) { IPCALC_MSG(bb_herror_msg_and_die( "cannot find hostname for %s", argv[optind]),); exit(EXIT_FAILURE); } for (x = 0; hostinfo->h_name[x]; x++) { hostinfo->h_name[x] = tolower(hostinfo->h_name[x]); } printf("HOSTNAME=%s\n", hostinfo->h_name); } #endif return EXIT_SUCCESS; } /* END CODE */ /* Local Variables: c-file-style: "linux" c-basic-offset: 4 tab-width: 4 End: */