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89 lines
2.6 KiB
89 lines
2.6 KiB
3 years ago
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diff -up tcp_wrappers_7.6/shell_cmd.c.patch20 tcp_wrappers_7.6/shell_cmd.c
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--- tcp_wrappers_7.6/shell_cmd.c.patch20 1994-12-28 17:42:44.000000000 +0100
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+++ tcp_wrappers_7.6/shell_cmd.c 2008-08-29 09:45:12.000000000 +0200
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@@ -20,6 +20,11 @@ static char sccsid[] = "@(#) shell_cmd.c
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#include <stdio.h>
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#include <syslog.h>
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#include <string.h>
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+#include <errno.h>
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+#include <unistd.h>
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+#include <sys/wait.h>
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+#include <sys/stat.h>
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+#include <fcntl.h>
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extern void exit();
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@@ -31,13 +36,42 @@ extern void exit();
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static void do_child();
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+/*
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+ * The sigchld handler. If there is a SIGCHLD caused by a child other than
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+ * ours, we set a flag and raise the signal later.
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+ */
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+volatile static int foreign_sigchld;
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+volatile static int our_child_pid;
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+static void sigchld(int sig, siginfo_t *si, void *unused)
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+{
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+ if (si && si->si_pid != our_child_pid)
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+ foreign_sigchld = 1;
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+}
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+
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/* shell_cmd - execute shell command */
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void shell_cmd(command)
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char *command;
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{
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int child_pid;
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- int wait_pid;
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+
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+ struct sigaction new_action, old_action;
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+ sigset_t new_mask, old_mask, empty_mask;
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+
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+ new_action.sa_sigaction = &sigchld;
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+ new_action.sa_flags = SA_SIGINFO;
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+ sigemptyset(&new_action.sa_mask);
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+ sigemptyset(&new_mask);
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+ sigemptyset(&empty_mask);
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+ sigaddset(&new_mask, SIGCHLD);
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+
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+ /*
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+ * Set the variables for handler, set the handler and block the signal
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+ * until we have the pid.
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+ */
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+ foreign_sigchld = 0; our_child_pid = 0;
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+ sigprocmask(SIG_BLOCK, &new_mask, &old_mask);
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+ sigaction(SIGCHLD, &new_action, &old_action);
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/*
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* Most of the work is done within the child process, to minimize the
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@@ -49,12 +83,26 @@ char *command;
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tcpd_warn("cannot fork: %m");
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break;
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case 00: /* child */
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+ /* Clear the blocked mask for the child not to be surprised. */
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+ sigprocmask(SIG_SETMASK, &empty_mask, 0);
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do_child(command);
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/* NOTREACHED */
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default: /* parent */
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- while ((wait_pid = wait((int *) 0)) != -1 && wait_pid != child_pid)
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- /* void */ ;
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+ our_child_pid = child_pid;
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+ sigprocmask(SIG_UNBLOCK, &new_mask, 0);
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+ while (waitpid(child_pid, (int *) 0, 0) == -1 && errno == EINTR);
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}
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+
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+ /*
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+ * Revert the signal mask and the SIGCHLD handler.
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+ */
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+ sigprocmask(SIG_SETMASK, &old_mask, 0);
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+ sigaction(SIGCHLD, &old_action, 0);
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+
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+ /* If there was a foreign SIGCHLD, raise it after we have restored the old
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+ * mask and handler. */
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+ if (foreign_sigchld)
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+ raise(SIGCHLD);
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}
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/* do_child - exec command with { stdin, stdout, stderr } to /dev/null */
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