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ifupdown: kill -TERM is default, so drop -TERM

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ifupdown: ferror() does not set errno, don't use perror
ifupdown: make netmask parsing smaller and more strict
(was accepting 255.0.255.0, 255.1234.0.0 etc...)

function                                             old     new   delta
count_bits                                            36       -     -36
execute                                             2573    2535     -38
------------------------------------------------------------------------------
(add/remove: 0/1 grow/shrink: 0/1 up/down: 0/-74)             Total: -74 bytes
   text    data     bss     dec     hex filename
 684204    2744   14000  700948   ab214 busybox_old
 684132    2744   14000  700876   ab1cc busybox_unstripped
This commit is contained in:
Denis Vlasenko 2007-07-03 08:26:24 +00:00
parent e190c16636
commit a48369183b
1 changed files with 50 additions and 37 deletions
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87
networking/ifupdown.c
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@ -104,31 +104,6 @@ static const char *startup_PATH;
#if ENABLE_FEATURE_IFUPDOWN_IPV4 || ENABLE_FEATURE_IFUPDOWN_IPV6
#if ENABLE_FEATURE_IFUPDOWN_IP
static unsigned count_bits(unsigned a)
{
unsigned result;
result = (a & 0x55) + ((a >> 1) & 0x55);
result = (result & 0x33) + ((result >> 2) & 0x33);
return (result & 0x0F) + ((result >> 4) & 0x0F);
}
static int count_netmask_bits(char *dotted_quad)
{
unsigned result, a, b, c, d;
/* Found a netmask... Check if it is dotted quad */
if (sscanf(dotted_quad, "%u.%u.%u.%u", &a, &b, &c, &d) != 4)
return -1;
// FIXME: will be confused by e.g. 255.0.255.0
result = count_bits(a);
result += count_bits(b);
result += count_bits(c);
result += count_bits(d);
return (int)result;
}
#endif
static void addstr(char **bufp, const char *str, size_t str_length)
{
/* xasprintf trick will be smaller, but we are often
@ -177,6 +152,39 @@ static char *get_var(const char *id, size_t idlen, struct interface_defn_t *ifd)
return NULL;
}
#if ENABLE_FEATURE_IFUPDOWN_IP
static int count_netmask_bits(const char *dotted_quad)
{
// int result;
// unsigned a, b, c, d;
// /* Found a netmask... Check if it is dotted quad */
// if (sscanf(dotted_quad, "%u.%u.%u.%u", &a, &b, &c, &d) != 4)
// return -1;
// if ((a|b|c|d) >> 8)
// return -1; /* one of numbers is >= 256 */
// d |= (a << 24) | (b << 16) | (c << 8); /* IP */
// d = ~d; /* 11110000 -> 00001111 */
/* Shorter version */
int result;
struct in_addr ip;
unsigned d;
if (inet_aton(dotted_quad, &ip) == 0)
return -1; /* malformed dotted IP */
d = ntohl(ip.s_addr); /* IP in host order */
d = ~d; /* 11110000 -> 00001111 */
if (d & (d+1)) /* check that it is in 00001111 form */
return -1; /* no it is not */
result = 32;
while (d) {
d >>= 1;
result--;
}
return result;
}
#endif
static char *parse(const char *command, struct interface_defn_t *ifd)
{
size_t old_pos[MAX_OPT_DEPTH] = { 0 };
@ -246,11 +254,14 @@ static char *parse(const char *command, struct interface_defn_t *ifd)
if (strncmp(command, "bnmask", 6) == 0) {
unsigned res;
varvalue = get_var("netmask", 7, ifd);
if (varvalue && (res = count_netmask_bits(varvalue)) > 0) {
const char *argument = utoa(res);
addstr(&result, argument, strlen(argument));
command = nextpercent + 1;
break;
if (varvalue) {
res = count_netmask_bits(varvalue);
if (res > 0) {
const char *argument = utoa(res);
addstr(&result, argument, strlen(argument));
command = nextpercent + 1;
break;
}
}
}
#endif
@ -463,7 +474,7 @@ static const struct dhcp_client_t ext_dhcp_clients[] = {
},
{ "udhcpc",
"udhcpc -R -n -p /var/run/udhcpc.%iface%.pid -i %iface%[[ -H %hostname%]][[ -c %clientid%]][[ -s %script%]]",
"kill -TERM `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null",
"kill `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null",
},
};
#endif /* ENABLE_FEATURE_IFUPDOWN_EXTERNAL_DHCPC */
@ -498,10 +509,10 @@ static int dhcp_down(struct interface_defn_t *ifd, execfn *exec)
bb_error_msg("no dhcp clients found, using static interface shutdown");
return static_down(ifd, exec);
#elif ENABLE_APP_UDHCPC
return execute("kill -TERM "
return execute("kill "
"`cat /var/run/udhcpc.%iface%.pid` 2>/dev/null", ifd, exec);
#else
return 0; /* no support for dhcp */
return 0; /* no dhcp support */
#endif
}
@ -834,7 +845,8 @@ static struct interfaces_file_t *read_interfaces(const char *filename)
free(buf);
}
if (ferror(f) != 0) {
bb_perror_msg_and_die("%s", filename);
/* ferror does NOT set errno! */
bb_error_msg_and_die("%s: I/O error", filename);
}
fclose(f);
@ -884,9 +896,10 @@ static void set_environ(struct interface_defn_t *iface, const char *mode)
for (i = 0; i < iface->n_options; i++) {
if (strcmp(iface->option[i].name, "up") == 0
|| strcmp(iface->option[i].name, "down") == 0
|| strcmp(iface->option[i].name, "pre-up") == 0
|| strcmp(iface->option[i].name, "post-down") == 0) {
|| strcmp(iface->option[i].name, "down") == 0
|| strcmp(iface->option[i].name, "pre-up") == 0
|| strcmp(iface->option[i].name, "post-down") == 0
) {
continue;
}
*(environend++) = setlocalenv("IF_%s=%s", iface->option[i].name, iface->option[i].value);