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zcip: convert lots of zero-initialized locals

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in zcip_main() to statics in bss.
This commit is contained in:
Denis Vlasenko 2006-09-03 12:26:06 +00:00
parent 035aae5841
commit 60e3dd6016
1 changed files with 43 additions and 41 deletions
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84
networking/zcip.c
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@ -72,11 +72,6 @@ enum {
DEFEND
};
/* Implicitly zero-initialized */
static const struct in_addr null_ip;
static const struct ether_addr null_addr;
static int verbose;
#define DBG(fmt,args...) \
do { } while (0)
#define VDBG DBG
@ -188,28 +183,35 @@ static unsigned ATTRIBUTE_ALWAYS_INLINE ms_rdelay(unsigned secs)
* main program
*/
/* Used to be auto variables on main() stack, but
* most of them were zero-inited. Moving them to bss
* is more space-efficient.
*/
static const struct in_addr null_ip; // = { 0 };
static const struct ether_addr null_addr; // = { {0, 0, 0, 0, 0, 0} };
static struct sockaddr saddr; // memset(0);
static struct in_addr ip; // = { 0 };
static struct ifreq ifr; //memset(0);
static char *intf; // = NULL;
static char *script; // = NULL;
static suseconds_t timeout; // = 0; // milliseconds
static unsigned conflicts; // = 0;
static unsigned nprobes; // = 0;
static unsigned nclaims; // = 0;
static int ready; // = 0;
static int quit; // = 0;
static int foreground; // = 0;
static int verbose; // = 0;
static int state = PROBE;
int zcip_main(int argc, char *argv[])
{
char *intf = NULL;
char *script = NULL;
int quit = 0;
int foreground = 0;
struct ether_addr eth_addr;
char *why;
struct sockaddr saddr;
struct ether_addr addr;
struct in_addr ip = { 0 };
int fd;
int ready = 0;
suseconds_t timeout = 0; // milliseconds
unsigned conflicts = 0;
unsigned nprobes = 0;
unsigned nclaims = 0;
int t;
int state = PROBE;
struct ifreq ifr;
unsigned short seed[3];
// parse commandline: prog [options] ifname script
while ((t = getopt(argc, argv, "fqr:v")) != EOF) {
@ -249,7 +251,7 @@ int zcip_main(int argc, char *argv[])
return EXIT_FAILURE;
// initialize saddr
memset(&saddr, 0, sizeof (saddr));
//memset(&saddr, 0, sizeof (saddr));
safe_strncpy(saddr.sa_data, intf, sizeof (saddr.sa_data));
// open an ARP socket
@ -258,21 +260,21 @@ int zcip_main(int argc, char *argv[])
xbind(fd, &saddr, sizeof (saddr);
// get the interface's ethernet address
memset(&ifr, 0, sizeof (ifr));
//memset(&ifr, 0, sizeof (ifr));
strncpy(ifr.ifr_name, intf, sizeof (ifr.ifr_name));
if (ioctl(fd, SIOCGIFHWADDR, &ifr) < 0) {
foreground = 1;
why = "get ethernet address";
goto bad;
}
memcpy(&addr, &ifr.ifr_hwaddr.sa_data, ETH_ALEN);
memcpy(&eth_addr, &ifr.ifr_hwaddr.sa_data, ETH_ALEN);
// start with some stable ip address, either a function of
// the hardware address or else the last address we used.
// NOTE: the sequence of addresses we try changes only
// depending on when we detect conflicts.
memcpy(seed, &ifr.ifr_hwaddr.sa_data, ETH_ALEN);
seed48(seed);
// (SVID 3 bogon: who says that "short" is always 16 bits?)
seed48( (unsigned short*)&ifr.ifr_hwaddr.sa_data );
if (ip.s_addr == 0)
pick(&ip);
@ -299,13 +301,13 @@ int zcip_main(int argc, char *argv[])
struct timeval tv1;
struct arp_packet p;
int source_ip_conflict = 0;
int target_ip_conflict = 0;
fds[0].fd = fd;
fds[0].events = POLLIN;
fds[0].revents = 0;
int source_ip_conflict = 0;
int target_ip_conflict = 0;
// poll, being ready to adjust current timeout
if (!timeout) {
timeout = ms_rdelay(PROBE_WAIT);
@ -338,7 +340,7 @@ int zcip_main(int argc, char *argv[])
VDBG("probe/%d %s@%s\n",
nprobes, intf, inet_ntoa(ip));
(void)arp(fd, &saddr, ARPOP_REQUEST,
&addr, null_ip,
&eth_addr, null_ip,
&null_addr, ip);
timeout = PROBE_MIN * 1000;
timeout += ms_rdelay(PROBE_MAX
@ -351,8 +353,8 @@ int zcip_main(int argc, char *argv[])
VDBG("announce/%d %s@%s\n",
nclaims, intf, inet_ntoa(ip));
(void)arp(fd, &saddr, ARPOP_REQUEST,
&addr, ip,
&addr, ip);
&eth_addr, ip,
&eth_addr, ip);
timeout = ANNOUNCE_INTERVAL * 1000;
}
break;
@ -364,8 +366,8 @@ int zcip_main(int argc, char *argv[])
VDBG("announce/%d %s@%s\n",
nclaims, intf, inet_ntoa(ip));
(void)arp(fd, &saddr, ARPOP_REQUEST,
&addr, ip,
&addr, ip);
&eth_addr, ip,
&eth_addr, ip);
timeout = ANNOUNCE_INTERVAL * 1000;
break;
case ANNOUNCE:
@ -376,8 +378,8 @@ int zcip_main(int argc, char *argv[])
VDBG("announce/%d %s@%s\n",
nclaims, intf, inet_ntoa(ip));
(void)arp(fd, &saddr, ARPOP_REQUEST,
&addr, ip,
&addr, ip);
&eth_addr, ip,
&eth_addr, ip);
timeout = ANNOUNCE_INTERVAL * 1000;
}
else {
@ -477,12 +479,12 @@ int zcip_main(int argc, char *argv[])
continue;
if (memcmp(p.arp.arp_spa, &ip.s_addr, sizeof(struct in_addr)) == 0 &&
memcmp(&addr, &p.arp.arp_sha, ETH_ALEN) != 0) {
memcmp(&eth_addr, &p.arp.arp_sha, ETH_ALEN) != 0) {
source_ip_conflict = 1;
}
if (memcmp(p.arp.arp_tpa, &ip.s_addr, sizeof(struct in_addr)) == 0 &&
p.arp.arp_op == htons(ARPOP_REQUEST) &&
memcmp(&addr, &p.arp.arp_tha, ETH_ALEN) != 0) {
memcmp(&eth_addr, &p.arp.arp_tha, ETH_ALEN) != 0) {
target_ip_conflict = 1;
}
@ -516,8 +518,8 @@ int zcip_main(int argc, char *argv[])
timeout = DEFEND_INTERVAL * 1000;
(void)arp(fd, &saddr,
ARPOP_REQUEST,
&addr, ip,
&addr, ip);
&eth_addr, ip,
&eth_addr, ip);
}
break;
case DEFEND: