Conditional compilation for @getnetbyname@, since Cygwin doesn't have

[fwd] / fw.c

diff --git a/fw.c b/fw.c
index 6b8f16d..a53d515 100644 (file)
--- a/fw.c
+++ b/fw.c
@@ -1,6 +1,6 @@
 /* -*-c-*-
  *
- * $Id: fw.c,v 1.9 2001/01/20 11:55:17 mdw Exp $
+ * $Id: fw.c,v 1.12 2002/01/13 14:49:17 mdw Exp $
  *
  * Port forwarding thingy
  *
@@ -29,6 +29,15 @@
 /*----- Revision history --------------------------------------------------* 
  *
  * $Log: fw.c,v $
+ * Revision 1.12  2002/01/13 14:49:17  mdw
+ * Track @dstr_vputf@ change.
+ *
+ * Revision 1.11  2001/02/03 20:33:26  mdw
+ * Fix flags to be unsigned.
+ *
+ * Revision 1.10  2001/02/03 20:30:03  mdw
+ * Support re-reading config files on SIGHUP.
+ *
  * Revision 1.9  2001/01/20 11:55:17  mdw
  * Handle select errors more robustly.
  *
@@ -65,6 +74,7 @@
 
 #include "config.h"
 
+#include <assert.h>
 #include <ctype.h>
 #include <errno.h>
 #include <signal.h>
@@ -103,8 +113,14 @@ sel_state *sel;                            /* Multiplexor for nonblocking I/O */
 
 /*----- Static variables --------------------------------------------------*/
 
+typedef struct conffile {
+  struct conffile *next;
+  char *name;
+} conffile;
+
 static unsigned flags = 0;             /* Global state flags */
 static unsigned active = 0;            /* Number of active things */
+static conffile *conffiles = 0;                /* List of configuration files */
 
 #define FW_SYSLOG 1u
 #define FW_QUIET 2u
@@ -138,7 +154,7 @@ void fw_log(time_t t, const char *fmt, ...)
   DENSURE(&d, 64);
   d.len += strftime(d.buf, d.sz, "%Y-%m-%d %H:%M:%S ", tm);
   va_start(ap, fmt);
-  dstr_vputf(&d, fmt, ap);
+  dstr_vputf(&d, fmt, &ap);
   va_end(ap);
   if (flags & FW_SYSLOG)
     syslog(LOG_NOTICE, "%s", d.buf);
@@ -189,14 +205,72 @@ static void fw_exit(void)
 
 static void fw_tidy(int n, void *p)
 {
-  const char *sn = "unexpected signal (bug!)";
-  if (n == SIGTERM)
-    sn = "SIGTERM";
-  else if (n == SIGINT)
-    sn = "SIGINT";
-
-  fw_log(-1, "closing down on %s", sn);
-  fw_exit();
+  const char *sn = 0;
+  switch (n) {
+    case SIGTERM: sn = "SIGTERM"; break;
+    case SIGINT: sn = "SIGINT"; break;
+    default: abort();
+  }
+
+  fw_log(-1, "closing down gracefully on %s", sn);
+  source_killall();
+}
+
+/* --- @fw_die@ --- *
+ *
+ * Arguments:  @int n@ = signal number
+ *             @void *p@ = an uninteresting argument
+ *
+ * Returns:    ---
+ *
+ * Use:                Handles various signals and causes an abrupt shutdown.
+ */
+
+static void fw_die(int n, void *p)
+{
+  const char *sn = 0;
+  switch (n) {
+    case SIGQUIT: sn = "SIGQUIT"; break;
+    default: abort();
+  }
+
+  fw_log(-1, "closing down abruptly on %s", sn);
+  source_killall();
+  endpt_killall();
+}
+
+/* --- @fw_reload@ --- *
+ *
+ * Arguments:  @int n@ = a signal number
+ *             @void *p@ = an uninteresting argument
+ *
+ * Returns:    ---
+ *
+ * Use:                Handles a hangup signal by re-reading configuration files.
+ */
+
+static void fw_reload(int n, void *p)
+{
+  FILE *fp;
+  scanner sc;
+  conffile *cf;
+
+  assert(n == SIGHUP);
+  if (!conffiles) {
+    fw_log(-1, "no configuration files to reload: ignoring SIGHUP");
+    return;
+  }
+  fw_log(-1, "reloading configuration files...");
+  source_killall();
+  scan_create(&sc);
+  for (cf = conffiles; cf; cf = cf->next) {
+    if ((fp = fopen(cf->name, "r")) == 0)
+      fw_log(-1, "error loading `%s': %s", cf->name, strerror(errno));
+    else
+      scan_add(&sc, scan_file(fp, cf->name, 0));
+  }
+  conf_parse(&sc);
+  fw_log(-1, "... reload completed OK");
 }
 
 /* --- Standard GNU help options --- */
@@ -357,17 +431,16 @@ int main(int argc, char *argv[])
 {
   unsigned f = 0;
   sel_state sst;
-  sig s_term, s_int;
+  sig s_term, s_quit, s_int, s_hup;
   scanner sc;
   uid_t drop = -1;
   gid_t dropg = -1;
+  conffile *cf, **cff = &conffiles;
 
-  enum {
-    f_bogus = 1,
-    f_file = 2,
-    f_syslog = 4,
-    f_fork = 8
-  };
+#define f_bogus 1u
+#define f_file 2u
+#define f_syslog 4u
+#define f_fork 8u
 
   /* --- Initialize things --- */
 
@@ -382,20 +455,6 @@ int main(int argc, char *argv[])
   fattr_init(&fattr_global);
   scan_create(&sc);
 
-  /* --- Set up some signal handlers --- *
-   *
-   * Don't enable @SIGINT@ if the caller already disabled it.
-   */
-
-  {
-    struct sigaction sa;
-
-    sig_add(&s_term, SIGTERM, fw_tidy, 0);
-    sigaction(SIGINT, 0, &sa);
-    if (sa.sa_handler != SIG_IGN)
-      sig_add(&s_int, SIGINT, fw_tidy, 0);
-  }
-
   atexit(fw_exit);
 
   /* --- Parse command line options --- */
@@ -463,6 +522,10 @@ int main(int argc, char *argv[])
          FILE *fp;
          if ((fp = fopen(optarg, "r")) == 0)
            die(1, "couldn't open file `%s': %s", optarg, strerror(errno));
+         cf = CREATE(conffile);
+         cf->name = optarg;
+         *cff = cf;
+         cff = &cf->next;
          scan_add(&sc, scan_file(fp, optarg, 0));
        }
        f |= f_file;
@@ -512,6 +575,7 @@ int main(int argc, char *argv[])
     usage(stderr);
     exit(1);
   }
+  *cff = 0;
 
   /* --- Deal with the remaining arguments --- */
 
@@ -531,6 +595,22 @@ int main(int argc, char *argv[])
 
   conf_parse(&sc);
 
+  /* --- Set up some signal handlers --- *
+   *
+   * Don't enable @SIGINT@ if the caller already disabled it.
+   */
+
+  {
+    struct sigaction sa;
+
+    sig_add(&s_term, SIGTERM, fw_tidy, 0);
+    sig_add(&s_quit, SIGQUIT, fw_die, 0);
+    sigaction(SIGINT, 0, &sa);
+    if (sa.sa_handler != SIG_IGN)
+      sig_add(&s_int, SIGINT, fw_tidy, 0);
+    sig_add(&s_hup, SIGHUP, fw_reload, 0);
+  }
+
   /* --- Drop privileges --- */
 
 #ifdef HAVE_SETGROUPS
@@ -579,7 +659,7 @@ int main(int argc, char *argv[])
     while (active) {
       if (!sel_select(sel))
         selerr = 0;
-      else {
+      else if (errno != EINTR && errno != EAGAIN) {
        fw_log(-1, "error from select: %s", strerror(errno));
        selerr++;
        if (selerr > 8) {