busybox/networking/hostname.c
Denis Vlasenko 084266ed52 fix several problems with config parser:
a bug where it underflows the string
 a bug where it never frees parser_t struct
make read_config() return 0 if parser is NULL,
 make config_close() accept and ignore NULL parser -
 eliminates many if() blocks
reverse the sense of parser bit flags - negative flags
 are harder to grok.
hexdump: revert the change to use config parser, it is BIGGER
 and also requires additional quirks in parser
*: explicitly use PARSER_NORMAL instead of 0

function                                             old     new   delta
login_main                                          1575    1596     +21
config_close                                          18      29     +11
bbunpack                                             383     391      +8
qgravechar                                           106     109      +3
rtnl_tab_initialize                                  121     117      -4
expand                                              1697    1693      -4
man_main                                             717     712      -5
nameif_main                                          674     668      -6
hexdump_main                                         597     591      -6
read_config                                          217     209      -8
dnsd_main                                           1478    1470      -8
sysctl_main                                          203     189     -14
config_open2                                          44      25     -19
make_device                                         1177    1141     -36
config_read                                          597     549     -48
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 4/11 up/down: 43/-158)         Total: -115 bytes
2008-07-26 23:08:31 +00:00

94 lines
2.1 KiB
C

/* vi: set sw=4 ts=4: */
/*
* Mini hostname implementation for busybox
*
* Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
*
* adjusted by Erik Andersen <andersen@codepoet.org> to remove
* use of long options and GNU getopt. Improved the usage info.
*
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
#include "libbb.h"
static void do_sethostname(char *s, int isfile)
{
if (!s)
return;
if (isfile) {
parser_t *parser = config_open2(s, xfopen_for_read);
while (config_read(parser, &s, 1, 1, "# \t", PARSE_NORMAL & ~PARSE_GREEDY)) {
do_sethostname(s, 0);
}
if (ENABLE_FEATURE_CLEAN_UP)
config_close(parser);
} else if (sethostname(s, strlen(s)) < 0) {
if (errno == EPERM)
bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
bb_perror_msg_and_die("sethostname");
}
}
int hostname_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int hostname_main(int argc, char **argv)
{
enum {
OPT_d = 0x1,
OPT_f = 0x2,
OPT_i = 0x4,
OPT_s = 0x8,
OPT_F = 0x10,
OPT_dfis = 0xf,
};
char *buf;
char *hostname_str;
if (argc < 1)
bb_show_usage();
getopt32(argv, "dfisF:", &hostname_str);
argv += optind;
buf = safe_gethostname();
/* Output in desired format */
if (option_mask32 & OPT_dfis) {
struct hostent *hp;
char *p;
hp = xgethostbyname(buf);
p = strchr(hp->h_name, '.');
if (option_mask32 & OPT_f) {
puts(hp->h_name);
} else if (option_mask32 & OPT_s) {
if (p)
*p = '\0';
puts(hp->h_name);
} else if (option_mask32 & OPT_d) {
if (p)
puts(p + 1);
} else if (option_mask32 & OPT_i) {
while (hp->h_addr_list[0]) {
printf("%s ", inet_ntoa(*(struct in_addr *) (*hp->h_addr_list++)));
}
bb_putchar('\n');
}
}
/* Set the hostname */
else if (option_mask32 & OPT_F) {
do_sethostname(hostname_str, 1);
} else if (argv[0]) {
do_sethostname(argv[0], 0);
}
/* Or if all else fails,
* just print the current hostname */
else {
puts(buf);
}
if (ENABLE_FEATURE_CLEAN_UP)
free(buf);
return EXIT_SUCCESS;
}