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Diffstat (limited to 'networking/udhcp/dhcpc.c')
-rw-r--r--networking/udhcp/dhcpc.c69
1 files changed, 39 insertions, 30 deletions
diff --git a/networking/udhcp/dhcpc.c b/networking/udhcp/dhcpc.c
index 4bb90c2..efe2088 100644
--- a/networking/udhcp/dhcpc.c
+++ b/networking/udhcp/dhcpc.c
@@ -109,7 +109,7 @@ static void perform_release(void)
static void client_background(void)
{
-#ifdef __uClinux__
+#if !BB_MMU
bb_error_msg("cannot background in uclinux (yet)");
/* ... mainly because udhcpc calls client_background()
* in _the _middle _of _udhcpc _run_, not at the start!
@@ -119,8 +119,7 @@ static void client_background(void)
bb_daemonize(0);
logmode &= ~LOGMODE_STDIO;
/* rewrite pidfile, as our pid is different now */
- if (client_config.pidfile)
- write_pidfile(client_config.pidfile);
+ write_pidfile(client_config.pidfile);
#endif
/* Do not fork again. */
client_config.foreground = 1;
@@ -148,19 +147,17 @@ int udhcpc_main(int argc, char **argv)
char *str_c, *str_V, *str_h, *str_F, *str_r, *str_T, *str_t;
uint32_t xid = 0;
uint32_t lease = 0; /* can be given as 32-bit quantity */
- unsigned t1 = 0, t2 = 0;
+ unsigned t1 = 0, t2 = 0; /* what a wonderful names */
unsigned start = 0;
unsigned now;
unsigned opt;
int max_fd;
- int sig;
int retval;
int len;
- int no_clientid = 0;
- fd_set rfds;
struct timeval tv;
- struct dhcpMessage packet;
struct in_addr temp_addr;
+ struct dhcpMessage packet;
+ fd_set rfds;
enum {
OPT_c = 1 << 0,
@@ -224,8 +221,7 @@ int udhcpc_main(int argc, char **argv)
if (opt & OPT_c)
client_config.clientid = alloc_dhcp_option(DHCP_CLIENT_ID, str_c, 0);
- if (opt & OPT_C)
- no_clientid = 1;
+ //if (opt & OPT_C)
if (opt & OPT_V)
client_config.vendorclass = alloc_dhcp_option(DHCP_VENDOR, str_V, 0);
if (opt & OPT_f)
@@ -262,7 +258,7 @@ int udhcpc_main(int argc, char **argv)
if (opt & OPT_t)
client_config.retries = xatoi_u(str_t);
if (opt & OPT_v) {
- printf("version %s\n\n", BB_VER);
+ printf("version %s\n", BB_VER);
return 0;
}
@@ -272,14 +268,23 @@ int udhcpc_main(int argc, char **argv)
}
if (read_interface(client_config.interface, &client_config.ifindex,
- NULL, client_config.arp) < 0)
+ NULL, client_config.arp))
return 1;
- /* Sanitize fd's and write pidfile */
- udhcp_make_pidfile(client_config.pidfile);
+ /* Make sure fd 0,1,2 are open */
+ bb_sanitize_stdio();
+ /* Equivalent of doing a fflush after every \n */
+ setlinebuf(stdout);
+
+ /* Create pidfile */
+ write_pidfile(client_config.pidfile);
+ /* if (!..) bb_perror_msg("cannot create pidfile %s", pidfile); */
+
+ /* Goes to stdout and possibly syslog */
+ bb_info_msg("%s (v%s) started", applet_name, BB_VER);
/* if not set, and not suppressed, setup the default client ID */
- if (!client_config.clientid && !no_clientid) {
+ if (!client_config.clientid && !(opt & OPT_C)) {
client_config.clientid = alloc_dhcp_option(DHCP_CLIENT_ID, "", 7);
client_config.clientid[OPT_DATA] = 1;
memcpy(client_config.clientid + OPT_DATA+1, client_config.arp, 6);
@@ -294,9 +299,12 @@ int udhcpc_main(int argc, char **argv)
state = INIT_SELECTING;
udhcp_run_script(NULL, "deconfig");
change_mode(LISTEN_RAW);
+ tv.tv_sec = 0;
+ goto jump_in;
for (;;) {
tv.tv_sec = timeout - monotonic_sec();
+ jump_in:
tv.tv_usec = 0;
if (listen_mode != LISTEN_NONE && sockfd < 0) {
@@ -307,13 +315,20 @@ int udhcpc_main(int argc, char **argv)
}
max_fd = udhcp_sp_fd_set(&rfds, sockfd);
+ retval = 0; /* If we already timed out, fall through, else... */
if (tv.tv_sec > 0) {
DEBUG("Waiting on select...");
retval = select(max_fd + 1, &rfds, NULL, NULL, &tv);
- } else retval = 0; /* If we already timed out, fall through */
+ }
now = monotonic_sec();
- if (retval == 0) {
+ if (retval < 0) {
+ /* EINTR? signal was caught, don't panic */
+ if (errno != EINTR) {
+ /* Else: an error occured, panic! */
+ bb_perror_msg_and_die("select");
+ }
+ } else if (retval == 0) {
/* timeout dropped to zero */
switch (state) {
case INIT_SELECTING:
@@ -377,9 +392,8 @@ int udhcpc_main(int argc, char **argv)
} else {
/* send a request packet */
send_renew(xid, server_addr, requested_ip); /* unicast */
-
t1 = (t2 - t1) / 2 + t1;
- timeout = t1 + start;
+ timeout = start + t1;
}
break;
case REBINDING:
@@ -395,9 +409,8 @@ int udhcpc_main(int argc, char **argv)
} else {
/* send a request packet */
send_renew(xid, 0, requested_ip); /* broadcast */
-
t2 = (lease - t2) / 2 + t2;
- timeout = t2 + start;
+ timeout = start + t2;
}
break;
case RELEASED:
@@ -405,7 +418,7 @@ int udhcpc_main(int argc, char **argv)
timeout = INT_MAX;
break;
}
- } else if (retval > 0 && listen_mode != LISTEN_NONE && FD_ISSET(sockfd, &rfds)) {
+ } else if (listen_mode != LISTEN_NONE && FD_ISSET(sockfd, &rfds)) {
/* a packet is ready, read it */
if (listen_mode == LISTEN_KERNEL)
@@ -480,7 +493,7 @@ int udhcpc_main(int argc, char **argv)
bb_info_msg("Lease of %s obtained, lease time %u",
inet_ntoa(temp_addr), (unsigned)lease);
start = now;
- timeout = t1 + start;
+ timeout = start + t1;
requested_ip = packet.yiaddr;
udhcp_run_script(&packet,
((state == RENEWING || state == REBINDING) ? "renew" : "bound"));
@@ -511,8 +524,9 @@ int udhcpc_main(int argc, char **argv)
break;
/* case BOUND, RELEASED: - ignore all packets */
}
- } else if (retval > 0 && (sig = udhcp_sp_read(&rfds))) {
- switch (sig) {
+ } else {
+ int signo = udhcp_sp_read(&rfds);
+ switch (signo) {
case SIGUSR1:
perform_renew();
break;
@@ -525,11 +539,6 @@ int udhcpc_main(int argc, char **argv)
perform_release();
goto ret0;
}
- } else if (retval == -1 && errno == EINTR) {
- /* a signal was caught */
- } else {
- /* An error occured */
- bb_perror_msg("select");
}
} /* for (;;) */
ret0:
generated by cgit v1.1 at 2024-11-01 08:34:35 +0000