diff options
author | Glenn L McGrath <bug1@ihug.co.nz> | 2003-09-02 10:59:57 +0400 |
---|---|---|
committer | Glenn L McGrath <bug1@ihug.co.nz> | 2003-09-02 10:59:57 +0400 |
commit | 530ea42abc7512bcd9738a4fcef7d97c2039f82a (patch) | |
tree | b57f0f2f4e0b1db1aa4a7a283902be1942426ace /networking/ipcalc.c | |
parent | dc4e75ef7ca135c836d22e380847672cf5b3773b (diff) |
adds the ability to use and calculate network prefix specifications instead
of netmasks. It also fixes the parameters for network and netmask to match
that of the official Red Hat version (-n for network and -m for netmask).
Patch by Joshua Jackson
Diffstat (limited to 'networking/ipcalc.c')
-rw-r--r-- | networking/ipcalc.c | 87 |
1 files changed, 78 insertions, 9 deletions
diff --git a/networking/ipcalc.c b/networking/ipcalc.c index 94b747ef6..9578c8266 100644 --- a/networking/ipcalc.c +++ b/networking/ipcalc.c @@ -40,11 +40,29 @@ static unsigned long get_netmask(unsigned long ipaddr) return 0; } +#ifdef CONFIG_FEATURE_IPCALC_FANCY +static int get_prefix(unsigned long netmask) +{ + unsigned long t; + int ret = 0; + + for (t = 0; t < 32; t++) { + if (htonl(netmask) & (0x80000000 >> t)) { + ret ++; + } else { + break; + } + } + return ret; +} +#endif + #define NETMASK 0x01 #define BROADCAST 0x02 #define NETWORK 0x04 -#define HOSTNAME 0x08 -#define SILENT 0x10 +#define NETPREFIX 0x08 +#define HOSTNAME 0x10 +#define SILENT 0x80 int ipcalc_main(int argc, char **argv) { @@ -55,11 +73,18 @@ int ipcalc_main(int argc, char **argv) unsigned long network; unsigned long ipaddr; +#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, 'n'}, + {"netmask", no_argument, NULL, 'm'}, {"broadcast", no_argument, NULL, 'b'}, - {"network", no_argument, NULL, 'w'}, + {"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 @@ -69,11 +94,11 @@ int ipcalc_main(int argc, char **argv) bb_applet_long_options = long_options; mode = bb_getopt_ulflags(argc, argv, #ifdef CONFIG_FEATURE_IPCALC_FANCY - "nbwhs"); + "mbnphs"); #else - "nbw"); + "mbn"); #endif - if (mode & (BROADCAST | NETWORK)) { + if (mode & (BROADCAST | NETWORK | NETPREFIX)) { if (argc - optind > 2) { bb_show_usage(); } @@ -83,16 +108,55 @@ int ipcalc_main(int argc, char **argv) } } +#ifdef CONFIG_FEATURE_IPCALC_FANCY + prefixstr = ipstr = argv[optind]; + + while(*prefixstr) { + if (*prefixstr == '/') { + *prefixstr = (char)0; + prefixstr++; + if (*prefixstr) { + netprefix = atol(prefixstr); + if (netprefix > 32) { + IPCALC_MSG(bb_error_msg_and_die("bad IP prefix: %s\n", prefixstr), + exit(EXIT_FAILURE)); + } + if (netprefix) { + netmask = 0x80000000; + netprefix--; + while(netprefix) { + netmask = 0x80000000 | (netmask >> 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_addr(ipstr); +#else ipaddr = inet_addr(argv[optind]); +#endif if (ipaddr == INADDR_NONE) { IPCALC_MSG(bb_error_msg_and_die("bad IP address: %s", argv[optind]), exit(EXIT_FAILURE)); } - if (argc - optind == 2) { - netmask = inet_addr(argv[optind + 1]); +#ifdef CONFIG_FEATURE_IPCALC_FANCY + if (have_netmask == 1) { + IPCALC_MSG(bb_error_msg_and_die("Both prefix and netmask were specified, use one or the other.\n"), + exit(EXIT_FAILURE)); + } + have_netmask = 1; +#endif + netmask = inet_addr(argv[optind + 1]); } if (ipaddr == INADDR_NONE) { @@ -118,7 +182,12 @@ int ipcalc_main(int argc, char **argv) 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; |