From 24833430bc2dbea733c3b0b9ea6c6b976f95474a Mon Sep 17 00:00:00 2001 From: Glenn L McGrath Date: Tue, 10 Jun 2003 17:22:49 +0000 Subject: Vodz, last_patch_88 --- networking/udhcp/dhcpc.c | 120 +++++++++-------------------------------------- 1 file changed, 22 insertions(+), 98 deletions(-) (limited to 'networking/udhcp/dhcpc.c') diff --git a/networking/udhcp/dhcpc.c b/networking/udhcp/dhcpc.c index c97e422..4612c41 100644 --- a/networking/udhcp/dhcpc.c +++ b/networking/udhcp/dhcpc.c @@ -19,9 +19,7 @@ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ -#include #include -#include #include #include #include @@ -40,11 +38,9 @@ #include "dhcpc.h" #include "options.h" #include "clientpacket.h" -#include "packet.h" #include "script.h" #include "socket.h" -#include "debug.h" -#include "pidfile.h" +#include "common.h" static int state; static unsigned long requested_ip; /* = 0 */ @@ -52,7 +48,6 @@ static unsigned long server_addr; static unsigned long timeout; static int packet_num; /* = 0 */ static int fd = -1; -static int signal_pipe[2]; #define LISTEN_NONE 0 #define LISTEN_KERNEL 1 @@ -80,34 +75,6 @@ struct client_config_t client_config = { arp: "\0\0\0\0\0\0", /* appease gcc-3.0 */ }; -#ifndef IN_BUSYBOX -static void __attribute__ ((noreturn)) bb_show_usage(void) -{ - printf( -"Usage: udhcpc [OPTIONS]\n\n" -" -c, --clientid=CLIENTID Client identifier\n" -" -H, --hostname=HOSTNAME Client hostname\n" -" -h Alias for -H\n" -" -f, --foreground Do not fork after getting lease\n" -" -b, --background Fork to background if lease cannot be\n" -" immediately negotiated.\n" -" -i, --interface=INTERFACE Interface to use (default: eth0)\n" -" -n, --now Exit with failure if lease cannot be\n" -" immediately negotiated.\n" -" -p, --pidfile=file Store process ID of daemon in file\n" -" -q, --quit Quit after obtaining lease\n" -" -r, --request=IP IP address to request (default: none)\n" -" -s, --script=file Run file at dhcp events (default:\n" -" " DEFAULT_SCRIPT ")\n" -" -v, --version Display version\n" - ); - exit(0); -} -#else -extern void bb_show_usage(void) __attribute__ ((noreturn)); -#endif - - /* just a little helper */ static void change_mode(int new_mode) { @@ -172,46 +139,15 @@ static void perform_release(void) } -/* Exit and cleanup */ -static void exit_client(int retval) -{ - pidfile_delete(client_config.pidfile); - CLOSE_LOG(); - exit(retval); -} - - -/* Signal handler */ -static void signal_handler(int sig) -{ - if (send(signal_pipe[1], &sig, sizeof(sig), MSG_DONTWAIT) < 0) { - LOG(LOG_ERR, "Could not send signal: %s", - strerror(errno)); - } -} - - -static void background(void) +static void client_background(void) { - int pid_fd; - - pid_fd = pidfile_acquire(client_config.pidfile); /* hold lock during fork. */ - while (pid_fd >= 0 && pid_fd < 3) pid_fd = dup(pid_fd); /* don't let daemon close it */ - if (daemon(0, 0) == -1) { - perror("fork"); - exit_client(1); - } + background(client_config.pidfile); client_config.foreground = 1; /* Do not fork again. */ client_config.background_if_no_lease = 0; - pidfile_write_release(pid_fd); } -#ifdef COMBINED_BINARY int udhcpc_main(int argc, char *argv[]) -#else -int main(int argc, char *argv[]) -#endif { unsigned char *temp, *message; unsigned long t1 = 0, t2 = 0, xid = 0; @@ -222,12 +158,11 @@ int main(int argc, char *argv[]) int c, len; struct dhcpMessage packet; struct in_addr temp_addr; - int pid_fd; time_t now; int max_fd; int sig; - static struct option arg_options[] = { + static const struct option arg_options[] = { {"clientid", required_argument, 0, 'c'}, {"foreground", no_argument, 0, 'f'}, {"background", no_argument, 0, 'b'}, @@ -240,7 +175,6 @@ int main(int argc, char *argv[]) {"request", required_argument, 0, 'r'}, {"script", required_argument, 0, 's'}, {"version", no_argument, 0, 'v'}, - {"help", no_argument, 0, '?'}, {0, 0, 0, 0} }; @@ -294,23 +228,18 @@ int main(int argc, char *argv[]) client_config.script = optarg; break; case 'v': - printf("udhcpcd, version %s\n\n", VERSION); - exit_client(0); + bb_error_msg("version %s\n", VERSION); + return(0); break; default: bb_show_usage(); } } - OPEN_LOG("udhcpc"); - LOG(LOG_INFO, "udhcp client (v%s) started", VERSION); - - pid_fd = pidfile_acquire(client_config.pidfile); - pidfile_write_release(pid_fd); - + start_log("client"); if (read_interface(client_config.interface, &client_config.ifindex, NULL, client_config.arp) < 0) - exit_client(1); + return(1); if (!client_config.clientid) { client_config.clientid = xmalloc(6 + 3); @@ -321,10 +250,7 @@ int main(int argc, char *argv[]) } /* setup signal handlers */ - socketpair(AF_UNIX, SOCK_STREAM, 0, signal_pipe); - signal(SIGUSR1, signal_handler); - signal(SIGUSR2, signal_handler); - signal(SIGTERM, signal_handler); + udhcp_set_signal_pipe(SIGUSR2); state = INIT_SELECTING; run_script(NULL, "deconfig"); @@ -342,16 +268,16 @@ int main(int argc, char *argv[]) else fd = raw_socket(client_config.ifindex); if (fd < 0) { - LOG(LOG_ERR, "FATAL: couldn't listen on socket, %s", strerror(errno)); - exit_client(0); + LOG(LOG_ERR, "FATAL: couldn't listen on socket, %m"); + return(0); } } if (fd >= 0) FD_SET(fd, &rfds); - FD_SET(signal_pipe[0], &rfds); + FD_SET(udhcp_signal_pipe[0], &rfds); if (tv.tv_sec > 0) { DEBUG(LOG_INFO, "Waiting on select...\n"); - max_fd = signal_pipe[0] > fd ? signal_pipe[0] : fd; + max_fd = udhcp_signal_pipe[0] > fd ? udhcp_signal_pipe[0] : fd; retval = select(max_fd + 1, &rfds, NULL, NULL, &tv); } else retval = 0; /* If we already timed out, fall through */ @@ -372,10 +298,10 @@ int main(int argc, char *argv[]) } else { if (client_config.background_if_no_lease) { LOG(LOG_INFO, "No lease, forking to background."); - background(); + client_background(); } else if (client_config.abort_if_no_lease) { LOG(LOG_INFO, "No lease, failing."); - exit_client(1); + return(1); } /* wait to try again */ packet_num = 0; @@ -453,7 +379,7 @@ int main(int argc, char *argv[]) else len = get_raw_packet(&packet, fd); if (len == -1 && errno != EINTR) { - DEBUG(LOG_INFO, "error on read, %s, reopening socket", strerror(errno)); + DEBUG(LOG_INFO, "error on read, %m, reopening socket"); change_mode(listen_mode); /* just close and reopen */ } if (len < 0) continue; @@ -517,9 +443,9 @@ int main(int argc, char *argv[]) state = BOUND; change_mode(LISTEN_NONE); if (client_config.quit_after_lease) - exit_client(0); + return(0); if (!client_config.foreground) - background(); + client_background(); } else if (*message == DHCPNAK) { /* return to init state */ @@ -537,10 +463,9 @@ int main(int argc, char *argv[]) break; /* case BOUND, RELEASED: - ignore all packets */ } - } else if (retval > 0 && FD_ISSET(signal_pipe[0], &rfds)) { - if (read(signal_pipe[0], &sig, sizeof(sig)) < 0) { - DEBUG(LOG_ERR, "Could not read signal: %s", - strerror(errno)); + } else if (retval > 0 && FD_ISSET(udhcp_signal_pipe[0], &rfds)) { + if (read(udhcp_signal_pipe[0], &sig, sizeof(sig)) < 0) { + DEBUG(LOG_ERR, "Could not read signal: %m"); continue; /* probably just EINTR */ } switch (sig) { @@ -552,7 +477,7 @@ int main(int argc, char *argv[]) break; case SIGTERM: LOG(LOG_INFO, "Received SIGTERM"); - exit_client(0); + return(0); } } else if (retval == -1 && errno == EINTR) { /* a signal was caught */ @@ -564,4 +489,3 @@ int main(int argc, char *argv[]) } return 0; } - -- cgit v1.1