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zcip: minor fixes

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This commit is contained in:
Denis Vlasenko 2006-09-03 12:29:53 +00:00
parent a9abecd85e
commit af906a3b6c
1 changed files with 21 additions and 20 deletions
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41
networking/zcip.c
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@ -72,9 +72,8 @@ enum {
DEFEND
};
#define DBG(fmt,args...) \
#define VDBG(fmt,args...) \
do { } while (0)
#define VDBG DBG
static unsigned long opts;
#define FOREGROUND (opts & 1)
@ -86,7 +85,7 @@ static unsigned long opts;
*/
static void pick(struct in_addr *ip)
{
unsigned tmp;
unsigned tmp;
/* use cheaper math than lrand48() mod N */
do {
@ -95,10 +94,12 @@ static void pick(struct in_addr *ip)
ip->s_addr = htonl((LINKLOCAL_ADDR + 0x0100) + tmp);
}
/* TODO: we need a flag to direct bb_[p]error_msg output to stderr. */
/**
* Broadcast an ARP packet.
*/
static int arp(int fd, struct sockaddr *saddr, int op,
static void arp(int fd, struct sockaddr *saddr, int op,
const struct ether_addr *source_addr, struct in_addr source_ip,
const struct ether_addr *target_addr, struct in_addr target_ip)
{
@ -127,14 +128,15 @@ static int arp(int fd, struct sockaddr *saddr, int op,
perror("sendto");
else
syslog(LOG_ERR, "sendto: %s", strerror(errno));
return -errno;
//return -errno;
}
return 0;
// Currently all callers ignore errors, that's why returns are
// commented out...
//return 0;
}
/**
* Run a script.
* TODO: we need a flag to direct bb_[p]error_msg output to stderr.
*/
static int run(char *script, char *arg, char *intf, struct in_addr *ip)
{
@ -233,22 +235,20 @@ int zcip_main(int argc, char *argv[])
char *r_opt;
bb_opt_complementally = "vv"; // -v options accumulate
opts = bb_getopt_ulflags(argc, argv, "fqr:v", &r_opt, &verbose);
if (opts & 4) {
if (opts & 4) { // -r n.n.n.n
if (inet_aton(r_opt, &ip) == 0
|| (ntohl(ip.s_addr) & IN_CLASSB_NET) != LINKLOCAL_ADDR) {
bb_error_msg_and_die("invalid link address");
}
}
if (verbose) opts |= 1;
if (verbose) opts |= 1; // -v implies -f
argc -= optind;
argv += optind;
if (argc != 2)
bb_show_usage();
intf = argv[0];
script = argv[1];
setenv("interface", intf, 1);
openlog(bb_applet_name, 0, LOG_DAEMON);
// initialize the interface (modprobe, ifup, etc)
if (run(script, "init", intf, NULL) < 0)
@ -287,6 +287,7 @@ int zcip_main(int argc, char *argv[])
// daemonize now; don't delay system startup
if (!FOREGROUND) {
xdaemon(0, verbose);
openlog(bb_applet_name, 0, LOG_DAEMON);
syslog(LOG_INFO, "start, interface %s", intf);
}
@ -335,13 +336,13 @@ int zcip_main(int argc, char *argv[])
VDBG("state = %d\n", state);
switch (state) {
case PROBE:
// timeouts in the PROBE state means no conflicting ARP packets
// timeouts in the PROBE state mean no conflicting ARP packets
// have been received, so we can progress through the states
if (nprobes < PROBE_NUM) {
nprobes++;
VDBG("probe/%d %s@%s\n",
nprobes, intf, inet_ntoa(ip));
(void)arp(fd, &saddr, ARPOP_REQUEST,
arp(fd, &saddr, ARPOP_REQUEST,
&eth_addr, null_ip,
&null_addr, ip);
timeout = PROBE_MIN * 1000;
@ -354,32 +355,32 @@ int zcip_main(int argc, char *argv[])
nclaims = 0;
VDBG("announce/%d %s@%s\n",
nclaims, intf, inet_ntoa(ip));
(void)arp(fd, &saddr, ARPOP_REQUEST,
arp(fd, &saddr, ARPOP_REQUEST,
&eth_addr, ip,
&eth_addr, ip);
timeout = ANNOUNCE_INTERVAL * 1000;
}
break;
case RATE_LIMIT_PROBE:
// timeouts in the RATE_LIMIT_PROBE state means no conflicting ARP packets
// timeouts in the RATE_LIMIT_PROBE state mean no conflicting ARP packets
// have been received, so we can move immediately to the announce state
state = ANNOUNCE;
nclaims = 0;
VDBG("announce/%d %s@%s\n",
nclaims, intf, inet_ntoa(ip));
(void)arp(fd, &saddr, ARPOP_REQUEST,
arp(fd, &saddr, ARPOP_REQUEST,
&eth_addr, ip,
&eth_addr, ip);
timeout = ANNOUNCE_INTERVAL * 1000;
break;
case ANNOUNCE:
// timeouts in the ANNOUNCE state means no conflicting ARP packets
// timeouts in the ANNOUNCE state mean no conflicting ARP packets
// have been received, so we can progress through the states
if (nclaims < ANNOUNCE_NUM) {
nclaims++;
VDBG("announce/%d %s@%s\n",
nclaims, intf, inet_ntoa(ip));
(void)arp(fd, &saddr, ARPOP_REQUEST,
arp(fd, &saddr, ARPOP_REQUEST,
&eth_addr, ip,
&eth_addr, ip);
timeout = ANNOUNCE_INTERVAL * 1000;
@ -394,7 +395,7 @@ int zcip_main(int argc, char *argv[])
conflicts = 0;
timeout = -1; // Never timeout in the monitor state.
// NOTE: all other exit paths
// NOTE: all other exit paths
// should deconfig ...
if (QUIT)
return EXIT_SUCCESS;
@ -518,7 +519,7 @@ int zcip_main(int argc, char *argv[])
VDBG("monitor conflict -- defending\n");
state = DEFEND;
timeout = DEFEND_INTERVAL * 1000;
(void)arp(fd, &saddr,
arp(fd, &saddr,
ARPOP_REQUEST,
&eth_addr, ip,
&eth_addr, ip);