add back in udhcp support

1 files changed, 135 insertions, 0 deletions

diff --git a/networking/udhcp/common.c b/networking/udhcp/common.c
new file mode 100644
index 000000000..f36009a1c
--- /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);
+}