*/
#include <getopt.h>
+#include <syslog.h>
+/* Override ENABLE_FEATURE_PIDFILE - ifupdown needs our pidfile to always exist */
+#define WANT_PIDFILE 1
#include "common.h"
#include "dhcpd.h"
#include "dhcpc.h"
#include "options.h"
-static int state;
/* Something is definitely wrong here. IPv4 addresses
* in variables of type long?? BTW, we use inet_ntoa()
* in the code. Manpage says that struct in_addr has a member of type long (!)
* which holds IPv4 address, and the struct is passed by value (!!)
*/
-static unsigned long requested_ip; /* = 0 */
+static unsigned timeout;
+static uint32_t requested_ip; /* = 0 */
static uint32_t server_addr;
-static unsigned long timeout;
static int packet_num; /* = 0 */
-static int fd = -1;
+static int sockfd = -1;
#define LISTEN_NONE 0
#define LISTEN_KERNEL 1
#define LISTEN_RAW 2
-static int listen_mode;
+static smallint listen_mode;
+
+static smallint state;
struct client_config_t client_config;
{
DEBUG("entering %s listen mode",
new_mode ? (new_mode == 1 ? "kernel" : "raw") : "none");
- if (fd >= 0) close(fd);
- fd = -1;
+ if (sockfd >= 0) {
+ close(sockfd);
+ sockfd = -1;
+ }
listen_mode = new_mode;
}
/* perform a release */
static void perform_release(void)
{
- char buffer[16];
+ char buffer[sizeof("255.255.255.255")];
struct in_addr temp_addr;
/* send release packet */
if (state == BOUND || state == RENEWING || state == REBINDING) {
temp_addr.s_addr = server_addr;
- sprintf(buffer, "%s", inet_ntoa(temp_addr));
+ strcpy(buffer, inet_ntoa(temp_addr));
temp_addr.s_addr = requested_ip;
bb_info_msg("Unicasting a release of %s to %s",
inet_ntoa(temp_addr), buffer);
change_mode(LISTEN_NONE);
state = RELEASED;
- timeout = 0x7fffffff;
+ timeout = INT_MAX;
}
static void client_background(void)
{
- udhcp_background(client_config.pidfile);
- client_config.foreground = 1; /* Do not fork again. */
+#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!
+ * If that will be properly disabled for NOMMU, client_background()
+ * will work on NOMMU too */
+#else
+ bb_daemonize(0);
+ logmode &= ~LOGMODE_STDIO;
+ /* rewrite pidfile, as our pid is different now */
+ write_pidfile(client_config.pidfile);
+#endif
+ /* Do not fork again. */
+ client_config.foreground = 1;
client_config.background_if_no_lease = 0;
}
}
-int udhcpc_main(int argc, char *argv[])
+int udhcpc_main(int argc, char **argv);
+int udhcpc_main(int argc, char **argv)
{
uint8_t *temp, *message;
char *str_c, *str_V, *str_h, *str_F, *str_r, *str_T, *str_t;
- unsigned long t1 = 0, t2 = 0, xid = 0;
- unsigned long start = 0, lease = 0;
- long now;
+ uint32_t xid = 0;
+ uint32_t lease = 0; /* can be given as 32-bit quantity */
+ 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,
OPT_T = 1 << 15,
OPT_t = 1 << 16,
OPT_v = 1 << 17,
+ OPT_S = 1 << 18,
};
#if ENABLE_GETOPT_LONG
- static const struct option arg_options[] = {
- { "clientid", required_argument, 0, 'c' },
- { "clientid-none", no_argument, 0, 'C' },
- { "vendorclass", required_argument, 0, 'V' },
- { "foreground", no_argument, 0, 'f' },
- { "background", no_argument, 0, 'b' },
- { "hostname", required_argument, 0, 'H' },
- { "hostname", required_argument, 0, 'h' },
- { "fqdn", required_argument, 0, 'F' },
- { "interface", required_argument, 0, 'i' },
- { "now", no_argument, 0, 'n' },
- { "pidfile", required_argument, 0, 'p' },
- { "quit", no_argument, 0, 'q' },
- { "release", no_argument, 0, 'R' },
- { "request", required_argument, 0, 'r' },
- { "script", required_argument, 0, 's' },
- { "timeout", required_argument, 0, 'T' },
- { "version", no_argument, 0, 'v' },
- { "retries", required_argument, 0, 't' },
- { 0, 0, 0, 0 }
- };
+ static const char udhcpc_longopts[] ALIGN1 =
+ "clientid\0" Required_argument "c"
+ "clientid-none\0" No_argument "C"
+ "vendorclass\0" Required_argument "V"
+ "foreground\0" No_argument "f"
+ "background\0" No_argument "b"
+ "hostname\0" Required_argument "H"
+ "hostname\0" Required_argument "h"
+ "fqdn\0" Required_argument "F"
+ "interface\0" Required_argument "i"
+ "now\0" No_argument "n"
+ "pidfile\0" Required_argument "p"
+ "quit\0" No_argument "q"
+ "release\0" No_argument "R"
+ "request\0" Required_argument "r"
+ "script\0" Required_argument "s"
+ "timeout\0" Required_argument "T"
+ "version\0" No_argument "v"
+ "retries\0" Required_argument "t"
+ "syslog\0" No_argument "S"
+ ;
#endif
/* Default options. */
client_config.interface = "eth0";
client_config.timeout = 3;
/* Parse command line */
- opt_complementary = "?:c--C:C--c" // mutually exclusive
+ opt_complementary = "c--C:C--c" // mutually exclusive
":hH:Hh"; // -h and -H are the same
#if ENABLE_GETOPT_LONG
- applet_long_options = arg_options;
+ applet_long_options = udhcpc_longopts;
#endif
- opt = getopt32(argc, argv, "c:CV:fbH:h:F:i:np:qRr:s:T:t:v",
+ opt = getopt32(argv, "c:CV:fbH:h:F:i:np:qRr:s:T:t:vS",
&str_c, &str_V, &str_h, &str_h, &str_F,
&client_config.interface, &client_config.pidfile, &str_r,
&client_config.script, &str_T, &str_t
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)
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;
}
- /* Start the log, sanitize fd's, and write a pid file */
- udhcp_start_log_and_pid(client_config.pidfile);
+ if (opt & OPT_S) {
+ openlog(applet_name, LOG_PID, LOG_LOCAL0);
+ logmode |= LOGMODE_SYSLOG;
+ }
if (read_interface(client_config.interface, &client_config.ifindex,
- NULL, client_config.arp) < 0)
+ NULL, client_config.arp))
return 1;
+ /* 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);
state = INIT_SELECTING;
udhcp_run_script(NULL, "deconfig");
change_mode(LISTEN_RAW);
+ tv.tv_sec = 0;
+ goto jump_in;
for (;;) {
- tv.tv_sec = timeout - uptime();
+ tv.tv_sec = timeout - monotonic_sec();
+ jump_in:
tv.tv_usec = 0;
- if (listen_mode != LISTEN_NONE && fd < 0) {
+ if (listen_mode != LISTEN_NONE && sockfd < 0) {
if (listen_mode == LISTEN_KERNEL)
- fd = listen_socket(INADDR_ANY, CLIENT_PORT, client_config.interface);
+ sockfd = listen_socket(/*INADDR_ANY,*/ CLIENT_PORT, client_config.interface);
else
- fd = raw_socket(client_config.ifindex);
+ sockfd = raw_socket(client_config.ifindex);
}
- max_fd = udhcp_sp_fd_set(&rfds, fd);
+ 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 = uptime();
- if (retval == 0) {
+ now = monotonic_sec();
+ 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:
client_background();
} else if (client_config.abort_if_no_lease) {
bb_info_msg("No lease, failing");
- return 1;
+ retval = 1;
+ goto ret;
}
/* wait to try again */
packet_num = 0;
packet_num++;
} else {
/* timed out, go back to init state */
- if (state == RENEW_REQUESTED) udhcp_run_script(NULL, "deconfig");
+ if (state == RENEW_REQUESTED)
+ udhcp_run_script(NULL, "deconfig");
state = INIT_SELECTING;
timeout = now;
packet_num = 0;
} 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:
} 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:
/* yah, I know, *you* say it would never happen */
- timeout = 0x7fffffff;
+ timeout = INT_MAX;
break;
}
- } else if (retval > 0 && listen_mode != LISTEN_NONE && FD_ISSET(fd, &rfds)) {
+ } else if (listen_mode != LISTEN_NONE && FD_ISSET(sockfd, &rfds)) {
/* a packet is ready, read it */
if (listen_mode == LISTEN_KERNEL)
- len = udhcp_get_packet(&packet, fd);
- else len = get_raw_packet(&packet, fd);
+ len = udhcp_get_packet(&packet, sockfd);
+ else len = get_raw_packet(&packet, sockfd);
if (len == -1 && errno != EINTR) {
DEBUG("error on read, %s, reopening socket", strerror(errno));
if (len < 0) continue;
if (packet.xid != xid) {
- DEBUG("Ignoring XID %lx (our xid is %lx)",
- (unsigned long) packet.xid, xid);
+ DEBUG("Ignoring XID %x (our xid is %x)",
+ (unsigned)packet.xid, (unsigned)xid);
continue;
}
continue;
}
- if ((message = get_option(&packet, DHCP_MESSAGE_TYPE)) == NULL) {
+ message = get_option(&packet, DHCP_MESSAGE_TYPE);
+ if (message == NULL) {
bb_error_msg("cannot get option from packet - ignoring");
continue;
}
t1 = lease / 2;
/* little fixed point for n * .875 */
- t2 = (lease * 0x7) >> 3;
+ t2 = (lease * 7) >> 3;
temp_addr.s_addr = packet.yiaddr;
- bb_info_msg("Lease of %s obtained, lease time %ld",
- inet_ntoa(temp_addr), lease);
+ 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"));
if (client_config.quit_after_lease) {
if (client_config.release_on_quit)
perform_release();
- return 0;
+ goto ret0;
}
if (!client_config.foreground)
client_background();
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;
bb_info_msg("Received SIGTERM");
if (client_config.release_on_quit)
perform_release();
- return 0;
+ goto ret0;
}
- } else if (retval == -1 && errno == EINTR) {
- /* a signal was caught */
- } else {
- /* An error occured */
- bb_perror_msg("select");
}
-
- }
- return 0;
+ } /* for (;;) */
+ ret0:
+ retval = 0;
+ ret:
+ /*if (client_config.pidfile) - remove_pidfile has it's own check */
+ remove_pidfile(client_config.pidfile);
+ return retval;
}
projects / oweals / busybox.git / blobdiff