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main.c
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/*
* This file is part of the UCB release of Plan 9. It is subject to the license
* terms in the LICENSE file found in the top-level directory of this
* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
* part of the UCB release of Plan 9, including this file, may be copied,
* modified, propagated, or distributed except according to the terms contained
* in the LICENSE file.
*/
/*
* ipconfig - configure parameters of an ip stack
*/
#include <benchutil/alarm.h>
#include <iplib/iplib.h>
#include <ndblib/ndb.h>
#include <parlib/common.h>
#include <parlib/printf-ext.h>
#include <parlib/uthread.h>
#include <stdio.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "dhcp.h"
#include "ipconfig.h"
#define DEBUG(...) do { if (debug) warning(__VA_ARGS__); } while (0)
/* possible verbs */
enum {
/* commands */
Vadd,
Vremove,
Vunbind,
Vaddpref6,
Vra6,
/* media */
Vether,
Vgbe,
Vloopback,
Vtorus,
Vtree,
Vpkt,
};
enum {
Taddr,
Taddrs,
Tstr,
Tbyte,
Tulong,
Tvec,
};
struct option {
char *name;
int type;
};
/*
* I was too lazy to look up the types for each of these
* options. If someone feels like it, please mail me a
* corrected array -- presotto
*/
struct option option[256] = {
[OBmask] { "ipmask", Taddr },
[OBtimeoff] { "timeoff", Tulong },
[OBrouter] { "ipgw", Taddrs },
[OBtimeserver] { "time", Taddrs },
[OBnameserver] { "name", Taddrs },
[OBdnserver] { "dns", Taddrs },
[OBlogserver] { "log", Taddrs },
[OBcookieserver] { "cookie", Taddrs },
[OBlprserver] { "lpr", Taddrs },
[OBimpressserver] { "impress", Taddrs },
[OBrlserver] { "rl", Taddrs },
[OBhostname] { "sys", Tstr },
[OBbflen] { "bflen", Tulong },
[OBdumpfile] { "dumpfile", Tstr },
[OBdomainname] { "dom", Tstr },
[OBswapserver] { "swap", Taddrs },
[OBrootpath] { "rootpath", Tstr },
[OBextpath] { "extpath", Tstr },
[OBipforward] { "ipforward", Taddrs },
[OBnonlocal] { "nonlocal", Taddrs },
[OBpolicyfilter] { "policyfilter", Taddrs },
[OBmaxdatagram] { "maxdatagram", Tulong },
[OBttl] { "ttl", Tulong },
[OBpathtimeout] { "pathtimeout", Taddrs },
[OBpathplateau] { "pathplateau", Taddrs },
[OBmtu] { "mtu", Tulong },
[OBsubnetslocal] { "subnetslocal", Taddrs },
[OBbaddr] { "baddr", Taddrs },
[OBdiscovermask] { "discovermask", Taddrs },
[OBsupplymask] { "supplymask", Taddrs },
[OBdiscoverrouter] { "discoverrouter", Taddrs },
[OBrsserver] { "rs", Taddrs },
[OBstaticroutes] { "staticroutes", Taddrs },
[OBtrailerencap] { "trailerencap", Taddrs },
[OBarptimeout] { "arptimeout", Tulong },
[OBetherencap] { "etherencap", Taddrs },
[OBtcpttl] { "tcpttl", Tulong },
[OBtcpka] { "tcpka", Tulong },
[OBtcpkag] { "tcpkag", Tulong },
[OBnisdomain] { "nisdomain", Tstr },
[OBniserver] { "ni", Taddrs },
[OBntpserver] { "ntp", Taddrs },
[OBnetbiosns] { "netbiosns", Taddrs },
[OBnetbiosdds] { "netbiosdds", Taddrs },
[OBnetbiostype] { "netbiostype", Taddrs },
[OBnetbiosscope] { "netbiosscope", Taddrs },
[OBxfontserver] { "xfont", Taddrs },
[OBxdispmanager] { "xdispmanager", Taddrs },
[OBnisplusdomain] { "nisplusdomain", Tstr },
[OBnisplusserver] { "nisplus", Taddrs },
[OBhomeagent] { "homeagent", Taddrs },
[OBsmtpserver] { "smtp", Taddrs },
[OBpop3server] { "pop3", Taddrs },
[OBnntpserver] { "nntp", Taddrs },
[OBwwwserver] { "www", Taddrs },
[OBfingerserver] { "finger", Taddrs },
[OBircserver] { "irc", Taddrs },
[OBstserver] { "st", Taddrs },
[OBstdaserver] { "stdar", Taddrs },
[ODipaddr] { "ipaddr", Taddr },
[ODlease] { "lease", Tulong },
[ODoverload] { "overload", Taddr },
[ODtype] { "type", Tbyte },
[ODserverid] { "serverid", Taddr },
[ODparams] { "params", Tvec },
[ODmessage] { "message", Tstr },
[ODmaxmsg] { "maxmsg", Tulong },
[ODrenewaltime] { "renewaltime", Tulong },
[ODrebindingtime] { "rebindingtime", Tulong },
[ODvendorclass] { "vendorclass", Tvec },
[ODclientid] { "clientid", Tvec },
[ODtftpserver] { "tftp", Taddr },
[ODbootfile] { "bootfile", Tstr },
};
uint8_t defrequested[] = {
OBmask, OBrouter, OBdnserver, OBhostname, OBdomainname, OBntpserver,
};
uint8_t requested[256];
int nrequested;
char *argv0;
int Oflag;
int beprimary = -1;
struct conf conf;
int debug;
int dodhcp;
int dondbconfig;
int dupl_disc = 1; /* flag: V6 duplicate neighbor discovery */
struct ctl *firstctl, **ctll;
struct ipifc *ifc;
int ipv6auto;
int myifc = -1;
char *ndboptions;
int nip;
int noconfig;
int nodhcpwatch;
char optmagic[4] = {0x63, 0x82, 0x53, 0x63};
int plan9 = 1;
int sendhostname;
char *verbs[] = {
[Vadd] "add",
[Vremove] "remove",
[Vunbind] "unbind",
[Vether] "ether",
[Vgbe] "gbe",
[Vloopback] "loopback",
[Vaddpref6] "add6",
[Vra6] "ra6",
[Vtorus] "torus",
[Vtree] "tree",
[Vpkt] "pkt",
};
void usage(void)
{
fprintf(stderr,
"usage: %s %s\n\t%s\n",
argv0,
"[-6dDGnNOpPruX][-b baud][-c ctl]* [-g gw] [-h host][-m mtu]",
"[-x mtpt][-o dhcpopt] type dev [verb] [laddr [mask [raddr [fs [auth]]]]]");
exit(1);
}
void warning(char *fmt, ...)
{
char buf[1024];
va_list arg;
va_start(arg, fmt);
vsnprintf(buf, sizeof(buf), fmt, arg);
va_end(arg);
fprintf(stderr, "%s: %s\n", argv0, buf);
}
char *sysname(void)
{
static char sname[256];
gethostname(sname, sizeof(sname));
return sname;
}
void parsenorm(int argc, char **argv)
{
switch (argc) {
case 5:
if (parseip(conf.auth, argv[4]) == -1)
usage();
/* fall through */
case 4:
if (parseip(conf.fs, argv[3]) == -1)
usage();
/* fall through */
case 3:
if (parseip(conf.raddr, argv[2]) == -1)
usage();
/* fall through */
case 2:
/*
* can't test for parseipmask()==-1 cuz 255.255.255.255
* looks like that.
*/
if (strcmp(argv[1], "0") != 0)
parseipmask(conf.mask, argv[1]);
/* fall through */
case 1:
if (parseip(conf.laddr, argv[0]) == -1)
usage();
/* fall through */
case 0:
break;
default:
usage();
}
}
void parse6pref(int argc, char **argv)
{
switch (argc) {
case 6:
conf.preflt = strtoul(argv[5], 0, 10);
/* fall through */
case 5:
conf.validlt = strtoul(argv[4], 0, 10);
/* fall through */
case 4:
conf.autoflag = (atoi(argv[3]) != 0);
/* fall through */
case 3:
conf.onlink = (atoi(argv[2]) != 0);
/* fall through */
case 2:
conf.prefixlen = atoi(argv[1]);
/* fall through */
case 1:
if (parseip(conf.v6pref, argv[0]) == -1) {
fprintf(stderr, "bad address %s", argv[0]);
exit(-1);
}
break;
}
DEBUG("parse6pref: pref %R len %d", conf.v6pref, conf.prefixlen);
}
/* parse router advertisement (keyword, value) pairs */
void parse6ra(int argc, char *argv[])
{
int i, argsleft;
char *kw, *val;
if (argc % 2 != 0)
usage();
i = 0;
for (argsleft = argc; argsleft > 1; argsleft -= 2) {
kw = argv[i];
val = argv[i + 1];
if (strcmp(kw, "recvra") == 0)
conf.recvra = (atoi(val) != 0);
else if (strcmp(kw, "sendra") == 0)
conf.sendra = (atoi(val) != 0);
else if (strcmp(kw, "mflag") == 0)
conf.mflag = (atoi(val) != 0);
else if (strcmp(kw, "oflag") == 0)
conf.oflag = (atoi(val) != 0);
else if (strcmp(kw, "maxraint") == 0)
conf.maxraint = atoi(val);
else if (strcmp(kw, "minraint") == 0)
conf.minraint = atoi(val);
else if (strcmp(kw, "linkmtu") == 0)
conf.linkmtu = atoi(val);
else if (strcmp(kw, "reachtime") == 0)
conf.reachtime = atoi(val);
else if (strcmp(kw, "rxmitra") == 0)
conf.rxmitra = atoi(val);
else if (strcmp(kw, "ttl") == 0)
conf.ttl = atoi(val);
else if (strcmp(kw, "routerlt") == 0)
conf.routerlt = atoi(val);
else {
warning("bad ra6 keyword %s", kw);
usage();
}
i += 2;
}
/* consistency check */
if (conf.maxraint < conf.minraint) {
fprintf(stderr, "maxraint %d < minraint %d",
conf.maxraint, conf.minraint);
exit(-1);
}
}
void init(void)
{
srand(lrand48());
if (register_printf_specifier('E', printf_ethaddr,
printf_ethaddr_info) != 0)
fprintf(stderr, "Installing 'E' failed\n");
if (register_printf_specifier('R', printf_ipaddr, printf_ipaddr_info) != 0)
fprintf(stderr, "Installing 'i' failed\n");
if (register_printf_specifier('M', printf_ipmask, printf_ipmask_info) != 0)
fprintf(stderr, "Installing 'M' failed\n");
setnetmtpt(conf.mpoint, sizeof(conf).mpoint, NULL);
conf.cputype = getenv("cputype");
if (conf.cputype == NULL)
conf.cputype = "386";
ctll = &firstctl;
v6paraminit(&conf);
/* init set of requested dhcp parameters with the default */
nrequested = sizeof(defrequested);
memcpy(requested, defrequested, nrequested);
}
int parseargs(int argc, char *argv[])
{
char *p;
int action, verb;
/* default to any host name we already have */
if (*conf.hostname == 0) {
p = getenv("sysname");
if (p == NULL || *p == 0)
p = sysname();
if (p != NULL)
strncpy(conf.hostname, p, sizeof(conf).hostname - 1);
}
/* defaults */
conf.type = "ether";
conf.dev = "/net/ether0";
action = Vadd;
/* get optional medium and device */
if (argc > 0) {
verb = parseverb(*argv);
switch (verb) {
case Vether:
case Vgbe:
case Vloopback:
case Vtorus:
case Vtree:
case Vpkt:
conf.type = *argv++;
argc--;
if (argc > 0) {
conf.dev = *argv++;
argc--;
}
break;
}
}
/* get optional verb */
if (argc > 0) {
verb = parseverb(*argv);
switch (verb) {
case Vether:
case Vgbe:
case Vloopback:
case Vtorus:
case Vtree:
case Vpkt:
fprintf(stderr, "medium %s already specified", conf.type);
exit(-1);
case Vadd:
case Vremove:
case Vunbind:
case Vaddpref6:
case Vra6:
argv++;
argc--;
action = verb;
break;
}
}
/* get verb-dependent arguments */
switch (action) {
case Vadd:
case Vremove:
case Vunbind:
parsenorm(argc, argv);
break;
case Vaddpref6:
parse6pref(argc, argv);
break;
case Vra6:
parse6ra(argc, argv);
break;
}
return action;
}
int main(int argc, char *argv[])
{
int retry, action, ch;
struct ctl *cp;
init();
retry = 0;
while ((ch = getopt(argc, argv, "6b:c:dDg:h:m:nNo:OpPrux:X")) != -1) {
switch (ch) {
case '6': /* IPv6 auto config */
ipv6auto = 1;
break;
case 'b':
conf.baud = optarg;
break;
case 'c':
cp = malloc(sizeof(*cp));
if (cp == NULL) {
fprintf(stderr, "%r");
exit(1);
}
*ctll = cp;
ctll = &cp->next;
cp->next = NULL;
cp->ctl = optarg;
break;
case 'd':
dodhcp = 1;
break;
case 'D':
debug = 1;
break;
case 'g':
if (parseip(conf.gaddr, optarg) == -1)
usage();
break;
case 'G':
plan9 = 0;
break;
case 'h':
snprintf(conf.hostname, sizeof(conf).hostname,
"%s", optarg);
sendhostname = 1;
break;
case 'm':
conf.mtu = atoi(optarg);
break;
case 'n':
noconfig = 1;
break;
case 'N':
dondbconfig = 1;
break;
case 'o':
if (addoption(optarg) < 0)
usage();
break;
case 'O':
Oflag = 1;
break;
case 'p':
beprimary = 1;
break;
case 'P':
beprimary = 0;
break;
case 'r':
retry = 1;
break;
case 'u': /* IPv6: duplicate neighbour disc. off */
dupl_disc = 0;
break;
case 'x':
setnetmtpt(conf.mpoint, sizeof(conf).mpoint, optarg);
break;
case 'X':
nodhcpwatch = 1;
break;
default:
usage();
}
}
argv0 = "ipconfig"; /* boot invokes us as tcp? */
argc -= optind;
argv += optind;
action = parseargs(argc, argv);
switch (action) {
case Vadd:
doadd(retry);
break;
case Vremove:
doremove();
break;
case Vunbind:
dounbind();
break;
case Vaddpref6:
case Vra6:
doipv6(action);
break;
}
return 0;
}
int havendb(char *net)
{
struct stat s;
char buf[128];
snprintf(buf, sizeof(buf), "%s/ndb", net);
if (stat(buf, &s) < 0)
return 0;
if (s.st_size == 0)
return 0;
return 1;
}
void doadd(int retry)
{
int tries;
/* get number of preexisting interfaces */
nip = nipifcs(conf.mpoint);
if (beprimary == -1 && (nip == 0 || !havendb(conf.mpoint)))
beprimary = 1;
/* get ipifc into name space and condition device for ip */
if (!noconfig) {
lookforip(conf.mpoint);
controldevice();
binddevice();
}
if (ipv6auto) {
if (ip6cfg(ipv6auto) < 0) {
fprintf(stderr, "can't automatically start IPv6 on %s",
conf.dev);
exit(-1);
}
} else if (validip(conf.laddr) && !isv4(conf.laddr)) {
if (ip6cfg(0) < 0)
fprintf(stderr, "can't start IPv6 on %s, address %R",
conf.dev, conf.laddr);
exit(-1);
}
if (!validip(conf.laddr)) {
if (dondbconfig)
ndbconfig();
else
dodhcp = 1;
}
/* run dhcp if we need something */
if (dodhcp) {
mkclientid();
for (tries = 0; tries < 30; tries++) {
dhcpquery(!noconfig, Sselecting);
if (conf.state == Sbound)
break;
usleep(1000 * 1000);
}
}
if (!validip(conf.laddr)) {
if (retry && dodhcp && !noconfig) {
warning("couldn't determine ip address, retrying");
dhcpwatch(1);
return;
}
fprintf(stderr, "no success with DHCP");
exit(-1);
}
if (!noconfig) {
if (ip4cfg() < 0) {
fprintf(stderr, "can't start ip");
exit(-1);
}
if (dodhcp && conf.lease != Lforever)
dhcpwatch(0);
}
/* leave everything we've learned somewhere other procs can find it */
if (beprimary == 1) {
putndb();
tweakservers();
}
}
void doremove(void)
{
char file[128];
char buf[256];
int cfd;
struct ipifc *nifc;
struct iplifc *lifc;
if (!validip(conf.laddr)) {
fprintf(stderr, "remove requires an address");
exit(-1);
}
ifc = readipifc(conf.mpoint, ifc, -1);
for (nifc = ifc; nifc != NULL; nifc = nifc->next) {
if (strcmp(nifc->dev, conf.dev) != 0)
continue;
for (lifc = nifc->lifc; lifc != NULL; lifc = lifc->next) {
if (ipcmp(conf.laddr, lifc->ip) != 0)
continue;
if (validip(conf.mask) && ipcmp(conf.mask, lifc->mask) != 0)
continue;
if (validip(conf.raddr) && ipcmp(conf.raddr, lifc->net) != 0)
continue;
snprintf(file, sizeof(file), "%s/ipifc/%d/ctl",
conf.mpoint, nifc->index);
cfd = open(file, O_RDWR);
if (cfd < 0) {
warning("can't open %s: %r", conf.mpoint);
continue;
}
snprintf(buf, sizeof(buf), "remove %R %M", lifc->ip, lifc->mask);
if (write(cfd, buf, strlen(buf)) != strlen(buf))
warning("can't remove %R %M from %s: %r",
lifc->ip, lifc->mask, file);
close(cfd);
}
}
}
void dounbind(void)
{
struct ipifc *nifc;
char file[128];
int cfd;
ifc = readipifc(conf.mpoint, ifc, -1);
for (nifc = ifc; nifc != NULL; nifc = nifc->next) {
if (strcmp(nifc->dev, conf.dev) == 0) {
snprintf(file, sizeof(file), "%s/ipifc/%d/ctl",
conf.mpoint, nifc->index);
cfd = open(file, O_RDWR);
if (cfd < 0) {
warning("can't open %s: %r", conf.mpoint);
break;
}
if (write(cfd, "unbind", strlen("unbind")) < 0)
warning("can't unbind from %s: %r", file);
close(cfd);
break;
}
}
}
/* set the default route */
void adddefroute(char *mpoint, uint8_t *gaddr)
{
char buf[256];
int cfd;
sprintf(buf, "%s/iproute", mpoint);
cfd = open(buf, O_RDWR);
if (cfd < 0)
return;
if (isv4(gaddr))
snprintf(buf, sizeof(buf), "add 0 0 %R", gaddr);
else
snprintf(buf, sizeof(buf), "add :: /0 %R", gaddr);
write(cfd, buf, strlen(buf));
close(cfd);
}
/* create a client id */
void mkclientid(void)
{
if ((strcmp(conf.type, "ether") == 0) || (strcmp(conf.type, "gbe") == 0)) {
if (myetheraddr(conf.hwa, conf.dev) == 0) {
conf.hwalen = 6;
conf.hwatype = 1;
conf.cid[0] = conf.hwatype;
memmove(&conf.cid[1], conf.hwa, conf.hwalen);
conf.cidlen = conf.hwalen + 1;
} else {
conf.hwatype = -1;
snprintf((char *)conf.cid, sizeof(conf).cid, "plan9_%ld.%d",
lrand48(), getpid());
conf.cidlen = strlen((char *)conf.cid);
}
}
}
/* bind ip into the namespace */
void lookforip(char *net)
{
struct stat s;
char proto[64];
snprintf(proto, sizeof(proto), "%s/ipifc", net);
if (stat(proto, &s) < 0) {
fprintf(stderr, "no ip stack bound onto %s", net);
exit(-1);
}
}
/* send some ctls to a device */
void controldevice(void)
{
char ctlfile[256];
int fd;
struct ctl *cp;
if (firstctl == NULL ||
(strcmp(conf.type, "ether") != 0 && strcmp(conf.type, "gbe") != 0))
return;
snprintf(ctlfile, sizeof(ctlfile), "%s/clone", conf.dev);
fd = open(ctlfile, O_RDWR);
if (fd < 0) {
fprintf(stderr, "can't open %s", ctlfile);
exit(-1);
}
for (cp = firstctl; cp != NULL; cp = cp->next) {
if (write(fd, cp->ctl, strlen(cp->ctl)) < 0) {
fprintf(stderr, "ctl message %s: %r", cp->ctl);
exit(-1);
}
lseek(fd, 0, 0);
}
}
/* bind an ip stack to a device, leave the control channel open */
void binddevice(void)
{
char buf[256];
if (myifc < 0) {
/* get a new ip interface */
snprintf(buf, sizeof(buf), "%s/ipifc/clone", conf.mpoint);
conf.cfd = open(buf, O_RDWR);
if (conf.cfd < 0) {
fprintf(stderr, "opening %s/ipifc/clone: %r", conf.mpoint);
exit(-1);
}
/* specify medium as ethernet, bind the interface to it */
snprintf(buf, sizeof(buf), "bind %s %s", conf.type, conf.dev);
if (write(conf.cfd, buf, strlen(buf)) != strlen(buf)) {
fprintf(stderr, "%s: bind %s %s: %r", buf, conf.type, conf.dev);
exit(-1);
}
} else {
/* open the old interface */
snprintf(buf, sizeof(buf), "%s/ipifc/%d/ctl", conf.mpoint, myifc);
conf.cfd = open(buf, O_RDWR);
if (conf.cfd < 0) {
fprintf(stderr, "open %s: %r", buf);
exit(-1);
}
}
}
/* add a logical interface to the ip stack */
int ip4cfg(void)
{
char buf[256];
int n;
if (!validip(conf.laddr))
return -1;
n = snprintf(buf, sizeof(buf), "add");
n += snprintf(buf + n, sizeof(buf) - n, " %R", conf.laddr);
if (!validip(conf.mask))
ipmove(conf.mask, defmask(conf.laddr));
n += snprintf(buf + n, sizeof(buf) - n, " %R", conf.mask);
if (validip(conf.raddr)) {
n += snprintf(buf + n, sizeof(buf) - n, " %R", conf.raddr);
if (conf.mtu != 0)
n += snprintf(buf + n, sizeof(buf) - n, " %d", conf.mtu);
}
if (write(conf.cfd, buf, n) < 0) {
warning("write(%s): %r", buf);
return -1;
}
if (beprimary == 1 && validip(conf.gaddr))
adddefroute(conf.mpoint, conf.gaddr);
return 0;
}
/* remove a logical interface to the ip stack */
void ipunconfig(void)
{
char buf[256];
int n;
if (!validip(conf.laddr))
return;
DEBUG("couldn't renew IP lease, releasing %R", conf.laddr);
n = sprintf(buf, "remove");
n += snprintf(buf + n, sizeof(buf) - n, " %R", conf.laddr);
if (!validip(conf.mask))
ipmove(conf.mask, defmask(conf.laddr));
n += snprintf(buf + n, sizeof(buf) - n, " %R", conf.mask);
write(conf.cfd, buf, n);
ipmove(conf.laddr, IPnoaddr);
ipmove(conf.raddr, IPnoaddr);
ipmove(conf.mask, IPnoaddr);
/* forget configuration info */
if (beprimary == 1)
writendb("", 0, 0);
}
void dhcpquery(int needconfig, int startstate)
{
char buf[256];
if (needconfig) {
snprintf(buf, sizeof(buf), "add %R %R", IPnoaddr, IPnoaddr);
write(conf.cfd, buf, strlen(buf));
}
conf.fd = openlisten();
if (conf.fd < 0) {
conf.state = Sinit;
return;
}
/* try dhcp for 10 seconds */
conf.xid = lrand48();
conf.starttime = time(0);
conf.state = startstate;
switch (startstate) {
case Sselecting:
conf.offered = 0;
dhcpsend(Discover);
break;
case Srenewing:
dhcpsend(Request);
break;
default:
fprintf(stderr, "internal error 0");
exit(-1);
}
conf.resend = 0;
conf.timeout = time(0) + 4;
while (conf.state != Sbound) {
dhcprecv();
if (dhcptimer() < 0)
break;
if (time(0) - conf.starttime > 10)
break;
}
close(conf.fd);
if (needconfig) {
snprintf(buf, sizeof(buf), "remove %R %R", IPnoaddr, IPnoaddr);
write(conf.cfd, buf, strlen(buf));
}
}
enum {
// This was an hour, but needs to be less for the ARM/GS1 until the timer
// code has been cleaned up (pb).
Maxsleep = 450,
};
void dhcpwatch(int needconfig)
{
int secs, s;
uint32_t t;
if (nodhcpwatch)
return;
switch (fork()) {
default:
return;
case 0:
break;
}
// procsetname("dhcpwatch");
/* keep trying to renew the lease */
for (;;) {
if (conf.lease == 0)
secs = 5;
else
secs = conf.lease >> 1;
/* avoid overflows */
for (s = secs; s > 0; s -= t) {
if (s > Maxsleep)
t = Maxsleep;
else
t = s;
usleep(t * 1000 * 1000);
}
if (conf.lease > 0) {
/*
* during boot, the starttime can be bogus so avoid
* spurious ipunconfig's
*/
t = time(0) - conf.starttime;
if (t > (3 * secs) / 2)
t = secs;
if (t >= conf.lease) {
conf.lease = 0;
if (!noconfig) {
ipunconfig();
needconfig = 1;
}
} else
conf.lease -= t;
}
dhcpquery(needconfig, needconfig ? Sselecting : Srenewing);
if (needconfig && conf.state == Sbound) {
if (ip4cfg() < 0) {
fprintf(stderr, "can't start ip: %r");
exit(-1);
}
needconfig = 0;
/*
* leave everything we've learned somewhere that
* other procs can find it.
*/
if (beprimary == 1) {
putndb();
tweakservers();
}
}
}
}
int dhcptimer(void)
{
uint32_t now;
now = time(0);
if (now < conf.timeout)
return 0;
switch (conf.state) {
default:
fprintf(stderr, "dhcptimer: unknown state %d", conf.state);
exit(-1);
case Sinit:
case Sbound:
break;
case Sselecting: