169 lines
4.0 KiB
Plaintext
169 lines
4.0 KiB
Plaintext
--- server/dhcpd.c Thu Jun 21 22:12:58 2001
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+++ server/dhcpd.c Wed Oct 17 08:23:00 2001
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@@ -56,6 +56,16 @@
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#include "version.h"
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#include <omapip/omapip_p.h>
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+#if defined (PARANOIA)
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+# include <sys/types.h>
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+# include <unistd.h>
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+# include <pwd.h>
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+/* get around the ISC declaration of group */
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+# define group real_group
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+# include <grp.h>
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+# undef group
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+#endif /* PARANOIA */
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+
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static void usage PROTO ((void));
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TIME cur_time;
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@@ -204,6 +214,22 @@
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omapi_object_dereference (&listener, MDL);
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}
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+#if defined (PARANOIA)
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+/* to be used in one of two possible scenarios */
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+static void setup_chroot (char *chroot_dir) {
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+ if (geteuid())
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+ log_fatal ("you must be root to use chroot");
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+
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+ if (chroot(chroot_dir)) {
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+ log_fatal ("chroot(\"%s\"): %m", chroot_dir);
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+ }
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+ if (chdir ("/")) {
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+ /* probably permission denied */
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+ log_fatal ("chdir(\"/\"): %m");
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+ }
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+}
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+#endif /* PARANOIA */
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+
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int main (argc, argv, envp)
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int argc;
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char **argv, **envp;
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@@ -236,6 +262,14 @@
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char *traceinfile = (char *)0;
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char *traceoutfile = (char *)0;
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#endif
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+#if defined (PARANOIA)
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+ char *set_user = 0;
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+ char *set_group = 0;
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+ char *set_chroot = 0;
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+
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+ uid_t set_uid = 0;
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+ gid_t set_gid = 0;
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+#endif /* PARANOIA */
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/* Make sure we have stdin, stdout and stderr. */
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status = open ("/dev/null", O_RDWR);
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@@ -298,6 +332,20 @@
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if (++i == argc)
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usage ();
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server = argv [i];
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+#if defined (PARANOIA)
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+ } else if (!strcmp (argv [i], "-user")) {
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+ if (++i == argc)
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+ usage ();
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+ set_user = argv [i];
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+ } else if (!strcmp (argv [i], "-group")) {
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+ if (++i == argc)
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+ usage ();
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+ set_group = argv [i];
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+ } else if (!strcmp (argv [i], "-chroot")) {
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+ if (++i == argc)
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+ usage ();
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+ set_chroot = argv [i];
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+#endif /* PARANOIA */
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} else if (!strcmp (argv [i], "-cf")) {
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if (++i == argc)
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usage ();
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@@ -397,6 +445,44 @@
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trace_seed_stop, MDL);
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#endif
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+#if defined (PARANOIA)
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+ /* get user and group info if those options were given */
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+ if (set_user) {
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+ struct passwd *tmp_pwd;
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+
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+ if (geteuid())
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+ log_fatal ("you must be root to set user");
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+
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+ if (!(tmp_pwd = getpwnam(set_user)))
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+ log_fatal ("no such user: %s", set_user);
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+
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+ set_uid = tmp_pwd->pw_uid;
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+
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+ /* use the user's group as the default gid */
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+ if (!set_group)
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+ set_gid = tmp_pwd->pw_gid;
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+ }
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+
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+ if (set_group) {
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+/* get around the ISC declaration of group */
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+#define group real_group
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+ struct group *tmp_grp;
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+
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+ if (geteuid())
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+ log_fatal ("you must be root to set group");
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+
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+ if (!(tmp_grp = getgrnam(set_group)))
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+ log_fatal ("no such group: %s", set_group);
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+
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+ set_gid = tmp_grp->gr_gid;
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+#undef group
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+ }
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+
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+# if defined (EARLY_CHROOT)
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+ if (set_chroot) setup_chroot (set_chroot);
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+# endif /* EARLY_CHROOT */
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+#endif /* PARANOIA */
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+
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/* Default to the DHCP/BOOTP port. */
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if (!local_port)
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{
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@@ -500,6 +586,10 @@
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postconf_initialization (quiet);
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+#if defined (PARANOIA) && !defined (EARLY_CHROOT)
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+ if (set_chroot) setup_chroot (set_chroot);
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+#endif /* PARANOIA && !EARLY_CHROOT */
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+
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/* test option should cause an early exit */
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if (cftest && !lftest)
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exit(0);
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@@ -543,6 +633,22 @@
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exit (0);
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}
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+#if defined (PARANOIA)
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+ /* change uid to the specified one */
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+
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+ if (set_gid) {
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+ if (setgroups (0, (void *)0))
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+ log_fatal ("setgroups: %m");
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+ if (setgid (set_gid))
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+ log_fatal ("setgid(%d): %m", (int) set_gid);
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+ }
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+
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+ if (set_uid) {
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+ if (setuid (set_uid))
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+ log_fatal ("setuid(%d): %m", (int) set_uid);
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+ }
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+#endif /* PARANOIA */
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+
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/* Read previous pid file. */
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if ((i = open (path_dhcpd_pid, O_RDONLY)) >= 0) {
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status = read (i, pbuf, (sizeof pbuf) - 1);
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@@ -888,6 +994,10 @@
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log_fatal ("Usage: dhcpd [-p <UDP port #>] [-d] [-f]%s%s%s%s",
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"\n [-cf config-file] [-lf lease-file]",
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+#if defined (PARANOIA)
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+ /* meld into the following string */
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+ "\n [-user user] [-group group] [-chroot dir]"
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+#endif /* PARANOIA */
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#if defined (TRACING)
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"\n [-tf trace-output-file]",
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"\n [-play trace-input-file]",
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