busybox/networking/ipcalc.c

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/* vi: set sw=4 ts=4: */
/*
* 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
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
//config:config IPCALC
//config: bool "ipcalc (4.4 kb)"
//config: default y
//config: help
//config: ipcalc takes an IP address and netmask and calculates the
//config: resulting broadcast, network, and host range.
//config:
//config:config FEATURE_IPCALC_LONG_OPTIONS
//config: bool "Enable long options"
//config: default y
//config: depends on IPCALC && LONG_OPTS
//config:
//config:config FEATURE_IPCALC_FANCY
//config: bool "Fancy IPCALC, more options, adds 1 kbyte"
//config: default y
//config: depends on IPCALC
//config: help
//config: Adds the options hostname, prefix and silent to the output of
//config: "ipcalc".
//applet:IF_IPCALC(APPLET_NOEXEC(ipcalc, ipcalc, BB_DIR_BIN, BB_SUID_DROP, ipcalc))
//kbuild:lib-$(CONFIG_IPCALC) += ipcalc.o
//usage:#define ipcalc_trivial_usage
//usage: "[OPTIONS] ADDRESS"
//usage: IF_FEATURE_IPCALC_FANCY("[/PREFIX]") " [NETMASK]"
//usage:#define ipcalc_full_usage "\n\n"
//usage: "Calculate and display network settings from IP address\n"
//usage: "\n -b Broadcast address"
//usage: "\n -n Network address"
//usage: "\n -m Default netmask for IP"
//usage: IF_FEATURE_IPCALC_FANCY(
//usage: "\n -p Prefix for IP/NETMASK"
//usage: "\n -h Resolved host name"
//usage: "\n -s No error messages"
//usage: )
#include "libbb.h"
/* After libbb.h, because on some systems it needs other includes */
#include <arpa/inet.h>
#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;
}
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#if ENABLE_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;
}
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#else
int get_prefix(unsigned long netmask);
#endif
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#define NETMASK 0x01
#define BROADCAST 0x02
#define NETWORK 0x04
#define NETPREFIX 0x08
#define HOSTNAME 0x10
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#define SILENT 0x20
#if ENABLE_FEATURE_IPCALC_LONG_OPTIONS
static const char ipcalc_longopts[] ALIGN1 =
"netmask\0" No_argument "m" // netmask from IP (assuming complete class A, B, or C network)
"broadcast\0" No_argument "b" // broadcast from IP [netmask]
"network\0" No_argument "n" // network from IP [netmask]
# if ENABLE_FEATURE_IPCALC_FANCY
"prefix\0" No_argument "p" // prefix from IP[/prefix] [netmask]
"hostname\0" No_argument "h" // hostname from IP
"silent\0" No_argument "s" // dont ever display error messages
# endif
;
getopt32: remove applet_long_options FEATURE_GETOPT_LONG made dependent on LONG_OPTS. The folloving options are removed, now LONG_OPTS enables long options for affected applets: FEATURE_ENV_LONG_OPTIONS FEATURE_EXPAND_LONG_OPTIONS FEATURE_UNEXPAND_LONG_OPTIONS FEATURE_MKDIR_LONG_OPTIONS FEATURE_MV_LONG_OPTIONS FEATURE_RMDIR_LONG_OPTIONS FEATURE_ADDGROUP_LONG_OPTIONS FEATURE_ADDUSER_LONG_OPTIONS FEATURE_HWCLOCK_LONG_OPTIONS FEATURE_NSENTER_LONG_OPTS FEATURE_CHCON_LONG_OPTIONS FEATURE_RUNCON_LONG_OPTIONS They either had a small number of long options, or their long options are essential. Example: upstream addgroup and adduser have ONLY longopts, we should probably go further and get rid of non-standard short options. To this end, make addgroup and adduser "select LONG_OPTS". We had this breakage caused by us even in our own package! #if ENABLE_LONG_OPTS || !ENABLE_ADDGROUP /* We try to use --gid, not -g, because "standard" addgroup * has no short option -g, it has only long --gid. */ argv[1] = (char*)"--gid"; #else /* Breaks if system in fact does NOT use busybox addgroup */ argv[1] = (char*)"-g"; #endif xargs: its lone longopt no longer depends on DESKTOP, only on LONG_OPTS. hwclock TODO: get rid of incompatible -t, -l aliases to --systz, --localtime Shorten help texts by omitting long option when short opt alternative exists. Reduction of size comes from the fact that store of an immediate (an address of longopts) to a fixed address (global variable) is a longer insn than pushing that immediate or passing it in a register. This effect is CPU-agnostic. function old new delta getopt32 1350 22 -1328 vgetopt32 - 1318 +1318 getopt32long - 24 +24 tftpd_main 562 567 +5 scan_recursive 376 380 +4 collect_cpu 545 546 +1 date_main 1096 1095 -1 hostname_main 262 259 -3 uname_main 259 255 -4 setpriv_main 362 358 -4 rmdir_main 191 187 -4 mv_main 562 558 -4 ipcalc_main 548 544 -4 ifenslave_main 641 637 -4 gzip_main 192 188 -4 gunzip_main 77 73 -4 fsfreeze_main 81 77 -4 flock_main 318 314 -4 deluser_main 337 333 -4 cp_main 374 370 -4 chown_main 175 171 -4 applet_long_options 4 - -4 xargs_main 894 889 -5 wget_main 2540 2535 -5 udhcpc_main 2767 2762 -5 touch_main 436 431 -5 tar_main 1014 1009 -5 start_stop_daemon_main 1033 1028 -5 sed_main 682 677 -5 script_main 1082 1077 -5 run_parts_main 330 325 -5 rtcwake_main 459 454 -5 od_main 2169 2164 -5 nl_main 201 196 -5 modprobe_main 773 768 -5 mkdir_main 160 155 -5 ls_main 568 563 -5 install_main 773 768 -5 hwclock_main 411 406 -5 getopt_main 622 617 -5 fstrim_main 256 251 -5 env_main 198 193 -5 dumpleases_main 635 630 -5 dpkg_main 3991 3986 -5 diff_main 1355 1350 -5 cryptpw_main 233 228 -5 cpio_main 593 588 -5 conspy_main 1135 1130 -5 chpasswd_main 313 308 -5 adduser_main 887 882 -5 addgroup_main 416 411 -5 ftpgetput_main 351 345 -6 get_terminal_width_height 242 234 -8 expand_main 690 680 -10 static.expand_longopts 18 - -18 static.unexpand_longopts 27 - -27 mkdir_longopts 28 - -28 env_longopts 30 - -30 static.ifenslave_longopts 34 - -34 mv_longopts 46 - -46 static.rmdir_longopts 48 - -48 packed_usage 31739 31687 -52 ------------------------------------------------------------------------------ (add/remove: 2/8 grow/shrink: 3/49 up/down: 1352/-1840) Total: -488 bytes text data bss dec hex filename 915681 485 6880 923046 e15a6 busybox_old 915428 485 6876 922789 e14a5 busybox_unstripped Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-08-08 20:08:18 +05:30
# define GETOPT32 getopt32long
# define LONGOPTS ,ipcalc_longopts
#else
# define GETOPT32 getopt32
# define LONGOPTS
#endif
int ipcalc_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int ipcalc_main(int argc UNUSED_PARAM, char **argv)
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{
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unsigned opt;
bool have_netmask = 0;
struct in_addr s_netmask, s_broadcast, s_network, s_ipaddr;
/* struct in_addr { in_addr_t s_addr; } and in_addr_t
* (which in turn is just a typedef to uint32_t)
* are essentially the same type. A few macros for less verbosity: */
#define netmask (s_netmask.s_addr)
#define broadcast (s_broadcast.s_addr)
#define network (s_network.s_addr)
#define ipaddr (s_ipaddr.s_addr)
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char *ipstr;
getopt32: remove opt_complementary function old new delta vgetopt32 1318 1392 +74 runsvdir_main 703 713 +10 bb_make_directory 423 425 +2 collect_cpu 546 545 -1 opt_chars 3 - -3 opt_complementary 4 - -4 tftpd_main 567 562 -5 ntp_init 476 471 -5 zcip_main 1266 1256 -10 xxd_main 428 418 -10 whois_main 140 130 -10 who_main 463 453 -10 which_main 212 202 -10 wget_main 2535 2525 -10 watchdog_main 291 281 -10 watch_main 222 212 -10 vlock_main 399 389 -10 uuencode_main 332 322 -10 uudecode_main 316 306 -10 unlink_main 45 35 -10 udhcpd_main 1482 1472 -10 udhcpc_main 2762 2752 -10 tune2fs_main 290 280 -10 tunctl_main 366 356 -10 truncate_main 218 208 -10 tr_main 518 508 -10 time_main 1134 1124 -10 tftp_main 286 276 -10 telnetd_main 1873 1863 -10 tcpudpsvd_main 1785 1775 -10 taskset_main 521 511 -10 tar_main 1009 999 -10 tail_main 1644 1634 -10 syslogd_main 1967 1957 -10 switch_root_main 368 358 -10 svlogd_main 1454 1444 -10 sv 1296 1286 -10 stat_main 104 94 -10 start_stop_daemon_main 1028 1018 -10 split_main 542 532 -10 sort_main 796 786 -10 slattach_main 624 614 -10 shuf_main 504 494 -10 setsid_main 96 86 -10 setserial_main 1132 1122 -10 setfont_main 388 378 -10 setconsole_main 78 68 -10 sendmail_main 1209 1199 -10 sed_main 677 667 -10 script_main 1077 1067 -10 run_parts_main 325 315 -10 rtcwake_main 454 444 -10 rm_main 175 165 -10 reformime_main 119 109 -10 readlink_main 123 113 -10 rdate_main 246 236 -10 pwdx_main 189 179 -10 pstree_main 317 307 -10 pscan_main 663 653 -10 popmaildir_main 818 808 -10 pmap_main 80 70 -10 nc_main 1042 1032 -10 mv_main 558 548 -10 mountpoint_main 477 467 -10 mount_main 1264 1254 -10 modprobe_main 768 758 -10 modinfo_main 333 323 -10 mktemp_main 200 190 -10 mkswap_main 324 314 -10 mkfs_vfat_main 1489 1479 -10 microcom_main 715 705 -10 md5_sha1_sum_main 521 511 -10 man_main 867 857 -10 makedevs_main 1052 1042 -10 ls_main 563 553 -10 losetup_main 432 422 -10 loadfont_main 89 79 -10 ln_main 524 514 -10 link_main 75 65 -10 ipcalc_main 544 534 -10 iostat_main 2397 2387 -10 install_main 768 758 -10 id_main 480 470 -10 i2cset_main 1239 1229 -10 i2cget_main 380 370 -10 i2cdump_main 1482 1472 -10 i2cdetect_main 682 672 -10 hwclock_main 406 396 -10 httpd_main 741 731 -10 grep_main 837 827 -10 getty_main 1559 1549 -10 fuser_main 297 287 -10 ftpgetput_main 345 335 -10 ftpd_main 2232 2222 -10 fstrim_main 251 241 -10 fsfreeze_main 77 67 -10 fsck_minix_main 2921 2911 -10 flock_main 314 304 -10 flashcp_main 740 730 -10 flash_eraseall_main 833 823 -10 fdformat_main 532 522 -10 expand_main 680 670 -10 eject_main 335 325 -10 dumpleases_main 630 620 -10 du_main 314 304 -10 dos2unix_main 441 431 -10 diff_main 1350 1340 -10 df_main 1064 1054 -10 date_main 1095 1085 -10 cut_main 961 951 -10 cryptpw_main 228 218 -10 crontab_main 575 565 -10 crond_main 1149 1139 -10 cp_main 370 360 -10 common_traceroute_main 3834 3824 -10 common_ping_main 1767 1757 -10 comm_main 239 229 -10 cmp_main 655 645 -10 chrt_main 379 369 -10 chpst_main 704 694 -10 chpasswd_main 308 298 -10 chown_main 171 161 -10 chmod_main 158 148 -10 cat_main 428 418 -10 bzip2_main 120 110 -10 blkdiscard_main 264 254 -10 base64_main 221 211 -10 arping_main 1665 1655 -10 ar_main 556 546 -10 adjtimex_main 406 396 -10 adduser_main 882 872 -10 addgroup_main 411 401 -10 acpid_main 1198 1188 -10 optstring 11 - -11 opt_string 18 - -18 OPT_STR 25 - -25 ubi_tools_main 1288 1258 -30 ls_options 31 - -31 ------------------------------------------------------------------------------ (add/remove: 0/6 grow/shrink: 3/129 up/down: 86/-1383) Total: -1297 bytes text data bss dec hex filename 915428 485 6876 922789 e14a5 busybox_old 914629 485 6872 921986 e1182 busybox_unstripped Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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opt = GETOPT32(argv, "^"
"mbn" IF_FEATURE_IPCALC_FANCY("phs")
"\0" "-1:?2"/*min 1, max 2 args*/
LONGOPTS
);
argv += optind;
if (opt & SILENT)
logmode = LOGMODE_NONE; /* suppress error_msg() output */
opt &= ~SILENT;
if (!(opt & (BROADCAST | NETWORK | NETPREFIX))) {
/* if no options at all or
* (no broadcast,network,prefix) and (two args)... */
if (!opt || argv[1])
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bb_show_usage();
}
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ipstr = argv[0];
if (ENABLE_FEATURE_IPCALC_FANCY) {
unsigned long netprefix = 0;
char *prefixstr;
prefixstr = ipstr;
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while (*prefixstr) {
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if (*prefixstr == '/') {
*prefixstr++ = '\0';
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if (*prefixstr) {
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unsigned msk;
netprefix = xatoul_range(prefixstr, 0, 32);
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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;
}
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break;
}
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prefixstr++;
}
}
if (inet_aton(ipstr, &s_ipaddr) == 0) {
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bb_error_msg_and_die("bad IP address: %s", argv[0]);
}
if (argv[1]) {
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if (ENABLE_FEATURE_IPCALC_FANCY && have_netmask) {
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bb_error_msg_and_die("use prefix or netmask, not both");
}
if (inet_aton(argv[1], &s_netmask) == 0) {
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bb_error_msg_and_die("bad netmask: %s", argv[1]);
}
} else {
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/* JHC - If the netmask wasn't provided then calculate it */
if (!ENABLE_FEATURE_IPCALC_FANCY || !have_netmask)
netmask = get_netmask(ipaddr);
}
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if (opt & NETMASK) {
printf("NETMASK=%s\n", inet_ntoa(s_netmask));
}
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if (opt & BROADCAST) {
broadcast = (ipaddr & netmask) | ~netmask;
printf("BROADCAST=%s\n", inet_ntoa(s_broadcast));
}
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if (opt & NETWORK) {
network = ipaddr & netmask;
printf("NETWORK=%s\n", inet_ntoa(s_network));
}
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if (ENABLE_FEATURE_IPCALC_FANCY) {
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if (opt & NETPREFIX) {
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printf("PREFIX=%i\n", get_prefix(netmask));
}
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if (opt & HOSTNAME) {
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struct hostent *hostinfo;
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hostinfo = gethostbyaddr((char *) &ipaddr, sizeof(ipaddr), AF_INET);
if (!hostinfo) {
bb_herror_msg_and_die("can't find hostname for %s", argv[0]);
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}
str_tolower(hostinfo->h_name);
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printf("HOSTNAME=%s\n", hostinfo->h_name);
}
}
return EXIT_SUCCESS;
}