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arp, networking/interface.c: eliminate statics

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and unneeded on-stack buffers, disable (comment out)
some apparently unused (and buggy) code paths. -700 bytes.
This commit is contained in:
Denis Vlasenko
2007-03-14 22:11:20 +00:00
parent 650a0459b8
commit 7f2527e5a7
3 changed files with 87 additions and 82 deletions
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126
networking/arp.c
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@ -27,8 +27,6 @@
#define DFLT_AF "inet"
#define DFLT_HW "ether"
#define _PATH_PROCNET_ARP "/proc/net/arp"
#define ARP_OPT_A (0x1)
#define ARP_OPT_p (0x2)
#define ARP_OPT_H (0x4)
@ -64,7 +62,7 @@ static const char *const options[] = {
/* Called only from main, once */
static int arp_del(char **args)
{
char host[128];
char *host;
struct arpreq req;
struct sockaddr sa;
int flags = 0;
@ -73,8 +71,8 @@ static int arp_del(char **args)
memset(&req, 0, sizeof(req));
/* Resolve the host name. */
safe_strncpy(host, *args, 128);
if (ap->input(0, host, &sa) < 0) {
host = *args;
if (ap->input(host, &sa) < 0) {
bb_herror_msg_and_die("%s", host);
}
@ -130,8 +128,8 @@ static int arp_del(char **args)
if (*++args == NULL)
bb_show_usage();
if (strcmp(*args, "255.255.255.255") != 0) {
safe_strncpy(host, *args, 128);
if (ap->input(0, host, &sa) < 0) {
host = *args;
if (ap->input(host, &sa) < 0) {
bb_herror_msg_and_die("%s", host);
}
memcpy(&req.arp_netmask, &sa, sizeof(struct sockaddr));
@ -213,15 +211,15 @@ static void arp_getdevhw(char *ifname, struct sockaddr *sa,
/* Called only from main, once */
static int arp_set(char **args)
{
char host[128];
char *host;
struct arpreq req;
struct sockaddr sa;
int flags;
memset(&req, 0, sizeof(req));
safe_strncpy(host, *args++, 128);
if (ap->input(0, host, &sa) < 0) {
host = *args++;
if (ap->input(host, &sa) < 0) {
bb_herror_msg_and_die("%s", host);
}
/* If a host has more than one address, use the correct one! */
@ -285,8 +283,8 @@ static int arp_set(char **args)
if (*++args == NULL)
bb_show_usage();
if (strcmp(*args, "255.255.255.255") != 0) {
safe_strncpy(host, *args++, 128);
if (ap->input(0, host, &sa) < 0) {
host = *args;
if (ap->input(host, &sa) < 0) {
bb_herror_msg_and_die("%s", host);
}
memcpy(&req.arp_netmask, &sa, sizeof(struct sockaddr));
@ -362,82 +360,82 @@ arp_disp(const char *name, char *ip, int type, int arp_flags,
/* Called only from main, once */
static int arp_show(char *name)
{
char host[100];
struct sockaddr sa;
char ip[100];
char hwa[100];
char mask[100];
char line[200];
char dev[100];
int type, flags;
FILE *fp;
const char *host;
const char *hostname;
FILE *fp;
struct sockaddr sa;
int type, flags;
int num;
unsigned entries = 0, shown = 0;
char ip[128];
char hwa[128];
char mask[128];
char line[128];
char dev[128];
host[0] = '\0';
host = NULL;
if (name != NULL) {
/* Resolve the host name. */
safe_strncpy(host, name, (sizeof host));
if (ap->input(0, host, &sa) < 0) {
bb_herror_msg_and_die("%s", host);
if (ap->input(name, &sa) < 0) {
bb_herror_msg_and_die("%s", name);
}
safe_strncpy(host, ap->sprint(&sa, 1), sizeof(host));
host = xstrdup(ap->sprint(&sa, 1));
}
/* Open the PROCps kernel table. */
fp = xfopen(_PATH_PROCNET_ARP, "r");
/* Bypass header -- read until newline */
if (fgets(line, sizeof(line), fp) != (char *) NULL) {
fp = xfopen("/proc/net/arp", "r");
/* Bypass header -- read one line */
fgets(line, sizeof(line), fp);
/* Read the ARP cache entries. */
while (fgets(line, sizeof(line), fp)) {
mask[0] = '-'; mask[1] = '\0';
dev[0] = '-'; dev[1] = '\0';
/* Read the ARP cache entries. */
for (; fgets(line, sizeof(line), fp);) {
num = sscanf(line, "%s 0x%x 0x%x %100s %100s %100s\n",
ip, &type, &flags, hwa, mask, dev);
if (num < 4)
break;
/* All these strings can't overflow
* because fgets above reads limited amount of data */
num = sscanf(line, "%s 0x%x 0x%x %s %s %s\n",
ip, &type, &flags, hwa, mask, dev);
if (num < 4)
break;
entries++;
/* if the user specified hw-type differs, skip it */
if (hw_set && (type != hw->type))
continue;
entries++;
/* if the user specified hw-type differs, skip it */
if (hw_set && (type != hw->type))
continue;
/* if the user specified address differs, skip it */
if (host[0] && strcmp(ip, host) != 0)
continue;
/* if the user specified address differs, skip it */
if (host && strcmp(ip, host) != 0)
continue;
/* if the user specified device differs, skip it */
if (device[0] && strcmp(dev, device) != 0)
continue;
/* if the user specified device differs, skip it */
if (device[0] && strcmp(dev, device) != 0)
continue;
shown++;
/* This IS ugly but it works -be */
if (option_mask32 & ARP_OPT_n)
shown++;
/* This IS ugly but it works -be */
hostname = "?";
if (!(option_mask32 & ARP_OPT_n)) {
if (ap->input(ip, &sa) < 0)
hostname = ip;
else
hostname = ap->sprint(&sa, (option_mask32 & ARP_OPT_n) | 0x8000);
if (strcmp(hostname, ip) == 0)
hostname = "?";
else {
if (ap->input(0, ip, &sa) < 0)
hostname = ip;
else
hostname = ap->sprint(&sa, (option_mask32 & ARP_OPT_n) | 0x8000);
if (strcmp(hostname, ip) == 0)
hostname = "?";
}
arp_disp(hostname, ip, type, flags, hwa, mask, dev);
}
arp_disp(hostname, ip, type, flags, hwa, mask, dev);
}
if (option_mask32 & ARP_OPT_v)
printf("Entries: %d\tSkipped: %d\tFound: %d\n",
entries, entries - shown, shown);
if (!shown) {
if (hw_set || host[0] || device[0])
if (hw_set || host || device[0])
printf("No match found in %d entries\n", entries);
}
fclose(fp);
if (ENABLE_FEATURE_CLEAN_UP) {
free((char*)host);
fclose(fp);
}
return 0;
}