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From af504e99abde04b881768d18eaa0054b36b16303 Mon Sep 17 00:00:00 2001
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From: Pavel Zhukov <pzhukov@redhat.com>
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Date: Thu, 21 Feb 2019 10:21:14 +0100
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Subject: [PATCH 03/26] Handle releasing interfaces requested by /sbin/ifup
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Cc: pzhukov@redhat.com
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---
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client/dhclient.c | 72 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
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1 file changed, 72 insertions(+)
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diff --git a/client/dhclient.c b/client/dhclient.c
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index 26a333c..2a2e9e6 100644
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--- a/client/dhclient.c
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+++ b/client/dhclient.c
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@@ -787,9 +787,81 @@ main(int argc, char **argv) {
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}
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}
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fclose(pidfd);
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+ } else {
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+ /* handle release for interfaces requested with Red Hat
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+ * /sbin/ifup - pidfile will be /var/run/dhclient-$interface.pid
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+ */
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+
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+ if ((path_dhclient_pid == NULL) || (*path_dhclient_pid == '\0'))
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+ path_dhclient_pid = "/var/run/dhclient.pid";
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+
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+ char *new_path_dhclient_pid;
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+ struct interface_info *ip;
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+ int pdp_len = strlen(path_dhclient_pid), pfx, dpfx;
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+
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+ /* find append point: beginning of any trailing '.pid'
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+ * or '-$IF.pid' */
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+ for (pfx=pdp_len; (pfx >= 0) && (path_dhclient_pid[pfx] != '.') && (path_dhclient_pid[pfx] != '/'); pfx--);
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+ if (pfx == -1)
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+ pfx = pdp_len;
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+
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+ if (path_dhclient_pid[pfx] == '/')
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+ pfx += 1;
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+
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+ for (dpfx=pfx; (dpfx >= 0) && (path_dhclient_pid[dpfx] != '-') && (path_dhclient_pid[dpfx] != '/'); dpfx--);
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+ if ((dpfx > -1) && (path_dhclient_pid[dpfx] != '/'))
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+ pfx = dpfx;
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+
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+ for (ip = interfaces; ip; ip = ip->next) {
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+ if (interfaces_requested && (ip->flags & (INTERFACE_REQUESTED))) {
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+ int n_len = strlen(ip->name);
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+
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+ new_path_dhclient_pid = (char*) malloc(pfx + n_len + 6);
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+ strncpy(new_path_dhclient_pid, path_dhclient_pid, pfx);
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+ sprintf(new_path_dhclient_pid + pfx, "-%s.pid", ip->name);
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+
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+ if ((pidfd = fopen(new_path_dhclient_pid, "r")) != NULL) {
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+ e = fscanf(pidfd, "%ld\n", &temp);
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+ oldpid = (pid_t)temp;
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+
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+ if (e != 0 && e != EOF) {
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+ if (oldpid) {
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+ if (kill(oldpid, SIGTERM) == 0)
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+ unlink(path_dhclient_pid);
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+ }
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+ }
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+
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+ fclose(pidfd);
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+ }
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+
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+ free(new_path_dhclient_pid);
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+ }
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+ }
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+ }
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+ } else {
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+ FILE *pidfp = NULL;
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+ long temp = 0;
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+ pid_t dhcpid = 0;
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+ int dhc_running = 0;
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+ char procfn[256] = "";
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+
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+ if ((pidfp = fopen(path_dhclient_pid, "r")) != NULL) {
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+ if ((fscanf(pidfp, "%ld", &temp)==1) && ((dhcpid=(pid_t)temp) > 0)) {
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+ snprintf(procfn,256,"/proc/%u",dhcpid);
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+ dhc_running = (access(procfn, F_OK) == 0);
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+ }
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+
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+ fclose(pidfp);
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+ }
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+
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+ if (dhc_running) {
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+ log_fatal("dhclient(%u) is already running - exiting. ", dhcpid);
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+ return(1);
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}
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}
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+ write_client_pid_file();
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+
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if (!quiet) {
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log_info("%s %s", message, PACKAGE_VERSION);
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log_info(copyright);
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--
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2.14.5
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