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authorMike Frysinger2006-05-08 03:20:50 +0000
committerMike Frysinger2006-05-08 03:20:50 +0000
commit7031f62d9b750568b5e98bdb8c59c3c1a72e073d (patch)
treeb8d037a539281e7f7592e3045fa59e445495f603 /networking/udhcp/common.c
parent15fe2e11d7886d04450cabc8b40f0d396b6b6d85 (diff)
downloadbusybox-7031f62d9b750568b5e98bdb8c59c3c1a72e073d.zip
busybox-7031f62d9b750568b5e98bdb8c59c3c1a72e073d.tar.gz
add back in udhcp support
Diffstat (limited to 'networking/udhcp/common.c')
-rw-r--r--networking/udhcp/common.c135
1 files changed, 135 insertions, 0 deletions
diff --git a/networking/udhcp/common.c b/networking/udhcp/common.c
new file mode 100644
index 0000000..f36009a
--- /dev/null
+++ b/networking/udhcp/common.c
@@ -0,0 +1,135 @@
+/* vi: set sw=4 ts=4: */
+/* common.c
+ *
+ * Functions for debugging and logging as well as some other
+ * simple helper functions.
+ *
+ * Russ Dill <Russ.Dill@asu.edu> 2001-2003
+ * Rewritten by Vladimir Oleynik <dzo@simtreas.ru> (C) 2003
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <paths.h>
+#include <sys/socket.h>
+#include <stdarg.h>
+
+#include "common.h"
+#include "pidfile.h"
+
+
+static int daemonized;
+
+long uptime(void)
+{
+ struct sysinfo info;
+ sysinfo(&info);
+ return info.uptime;
+}
+
+
+/*
+ * This function makes sure our first socket calls
+ * aren't going to fd 1 (printf badness...) and are
+ * not later closed by daemon()
+ */
+static inline void sanitize_fds(void)
+{
+ int zero;
+ if ((zero = open(_PATH_DEVNULL, O_RDWR, 0)) < 0) return;
+ while (zero < 3) zero = dup(zero);
+ close(zero);
+}
+
+
+void background(const char *pidfile)
+{
+#ifdef __uClinux__
+ LOG(LOG_ERR, "Cannot background in uclinux (yet)");
+#else /* __uClinux__ */
+ int pid_fd;
+
+ /* hold lock during fork. */
+ pid_fd = pidfile_acquire(pidfile);
+ if (daemon(0, 0) == -1) { /* bb_xdaemon? */
+ perror("fork");
+ exit(1);
+ }
+ daemonized++;
+ pidfile_write_release(pid_fd);
+#endif /* __uClinux__ */
+}
+
+
+#ifdef UDHCP_SYSLOG
+
+void udhcp_logging(int level, const char *fmt, ...)
+{
+ va_list p;
+ va_list p2;
+
+ va_start(p, fmt);
+ __va_copy(p2, p);
+ if(!daemonized) {
+ vprintf(fmt, p);
+ putchar('\n');
+ }
+ vsyslog(level, fmt, p2);
+ va_end(p);
+}
+
+#else
+
+
+static char *syslog_level_msg[] = {
+ [LOG_EMERG] = "EMERGENCY!",
+ [LOG_ALERT] = "ALERT!",
+ [LOG_CRIT] = "critical!",
+ [LOG_WARNING] = "warning",
+ [LOG_ERR] = "error",
+ [LOG_INFO] = "info",
+ [LOG_DEBUG] = "debug"
+};
+
+
+void udhcp_logging(int level, const char *fmt, ...)
+{
+ va_list p;
+
+ va_start(p, fmt);
+ if(!daemonized) {
+ printf("%s, ", syslog_level_msg[level]);
+ vprintf(fmt, p);
+ putchar('\n');
+ }
+ va_end(p);
+}
+#endif
+
+
+void start_log_and_pid(const char *client_server, const char *pidfile)
+{
+ int pid_fd;
+
+ /* Make sure our syslog fd isn't overwritten */
+ sanitize_fds();
+
+ /* do some other misc startup stuff while we are here to save bytes */
+ pid_fd = pidfile_acquire(pidfile);
+ pidfile_write_release(pid_fd);
+
+ /* equivelent of doing a fflush after every \n */
+ setlinebuf(stdout);
+
+#ifdef UDHCP_SYSLOG
+ openlog(client_server, LOG_PID | LOG_CONS, LOG_LOCAL0);
+#endif
+
+ udhcp_logging(LOG_INFO, "%s (v%s) started", client_server, VERSION);
+}