diff options
Diffstat (limited to 'networking/zcip.c')
| -rw-r--r-- | networking/zcip.c | 84 |
1 files changed, 43 insertions, 41 deletions
diff --git a/networking/zcip.c b/networking/zcip.c index 176bc01..e781a58 100644 --- a/networking/zcip.c +++ b/networking/zcip.c @@ -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(ð_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, + ð_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); + ð_addr, ip, + ð_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); + ð_addr, ip, + ð_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); + ð_addr, ip, + ð_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(ð_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(ð_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); + ð_addr, ip, + ð_addr, ip); } break; case DEFEND: |