X-Git-Url: https://git.tokkee.org/?a=blobdiff_plain;f=src%2Fexec.c;h=d560f465490dae28bb9241fafd04f35444e78625;hb=1122c8fd30065b5990a5b798b7bfd8891736def9;hp=fbd9c268bcd74102ef0381ea11023944a9d59baf;hpb=7285e5f59ffa4efb391485fe9b35ee02f3dc856f;p=collectd.git

diff --git a/src/exec.c b/src/exec.c
index fbd9c268..d560f465 100644
--- a/src/exec.c
+++ b/src/exec.c
@@ -23,6 +23,7 @@
  *   Peter Holik <peter at holik.at>
  **/
 
+#define _DEFAULT_SOURCE
 #define _BSD_SOURCE /* For setgroups */
 
 #include "collectd.h"
@@ -287,71 +288,11 @@ static void set_environment (void) /* {{{ */
 } /* }}} void set_environment */
 
 __attribute__((noreturn))
-static void exec_child (program_list_t *pl) /* {{{ */
+static void exec_child (program_list_t *pl, int uid, int gid, int egid) /* {{{ */
 {
   int status;
-  int uid;
-  int gid;
-  int egid;
-
-  struct passwd *sp_ptr;
-  struct passwd sp;
-  char nambuf[2048];
   char errbuf[1024];
 
-  sp_ptr = NULL;
-  status = getpwnam_r (pl->user, &sp, nambuf, sizeof (nambuf), &sp_ptr);
-  if (status != 0)
-  {
-    ERROR ("exec plugin: Failed to get user information for user ``%s'': %s",
-        pl->user, sstrerror (errno, errbuf, sizeof (errbuf)));
-    exit (-1);
-  }
-  if (sp_ptr == NULL)
-  {
-    ERROR ("exec plugin: No such user: `%s'", pl->user);
-    exit (-1);
-  }
-
-  uid = sp.pw_uid;
-  gid = sp.pw_gid;
-  if (uid == 0)
-  {
-    ERROR ("exec plugin: Cowardly refusing to exec program as root.");
-    exit (-1);
-  }
-
-  /* The group configured in the configfile is set as effective group, because
-   * this way the forked process can (re-)gain the user's primary group. */
-  egid = -1;
-  if (NULL != pl->group)
-  {
-    if ('\0' != *pl->group) {
-      struct group *gr_ptr = NULL;
-      struct group gr;
-
-      status = getgrnam_r (pl->group, &gr, nambuf, sizeof (nambuf), &gr_ptr);
-      if (0 != status)
-      {
-        ERROR ("exec plugin: Failed to get group information "
-            "for group ``%s'': %s", pl->group,
-            sstrerror (errno, errbuf, sizeof (errbuf)));
-        exit (-1);
-      }
-      if (NULL == gr_ptr)
-      {
-        ERROR ("exec plugin: No such group: `%s'", pl->group);
-        exit (-1);
-      }
-
-      egid = gr.gr_gid;
-    }
-    else
-    {
-      egid = gid;
-    }
-  } /* if (pl->group == NULL) */
-
 #if HAVE_SETGROUPS
   if (getuid () == 0)
   {
@@ -398,7 +339,7 @@ static void exec_child (program_list_t *pl) /* {{{ */
     exit (-1);
   }
 
-  status = execvp (pl->exec, pl->argv);
+  execvp (pl->exec, pl->argv);
 
   ERROR ("exec plugin: Failed to execute ``%s'': %s",
       pl->exec, sstrerror (errno, errbuf, sizeof (errbuf)));
@@ -414,6 +355,31 @@ static void reset_signal_mask (void) /* {{{ */
   sigprocmask (SIG_SETMASK, &ss, /* old mask = */ NULL);
 } /* }}} void reset_signal_mask */
 
+static int create_pipe (int fd_pipe[2]) /* {{{ */
+{
+  char errbuf[1024];
+  int status;
+
+  status = pipe (fd_pipe);
+  if (status != 0)
+  {
+    ERROR ("exec plugin: pipe failed: %s",
+        sstrerror (errno, errbuf, sizeof (errbuf)));
+    return (-1);
+  }
+
+  return 0;
+} /* }}} int create_pipe */
+
+static void close_pipe (int fd_pipe[2]) /* {{{ */
+{
+  if (fd_pipe[0] != -1)
+    close (fd_pipe[0]);
+
+  if (fd_pipe[1] != -1)
+    close (fd_pipe[1]);
+} /* }}} void close_pipe */
+
 /*
  * Creates three pipes (one for reading, one for writing and one for errors),
  * forks a child, sets up the pipes so that fd_in is connected to STDIN of
@@ -422,46 +388,89 @@ static void reset_signal_mask (void) /* {{{ */
  */
 static int fork_child (program_list_t *pl, int *fd_in, int *fd_out, int *fd_err) /* {{{ */
 {
-  int fd_pipe_in[2];
-  int fd_pipe_out[2];
-  int fd_pipe_err[2];
+  int fd_pipe_in[2] = {-1, -1};
+  int fd_pipe_out[2] = {-1, -1};
+  int fd_pipe_err[2] = {-1, -1};
   char errbuf[1024];
   int status;
   int pid;
 
+  int uid;
+  int gid;
+  int egid;
+
+  struct passwd *sp_ptr;
+  struct passwd sp;
+  char nambuf[2048];
+
   if (pl->pid != 0)
     return (-1);
 
-  status = pipe (fd_pipe_in);
+  if ((create_pipe(fd_pipe_in) == -1)
+      || (create_pipe(fd_pipe_out) == -1)
+      || (create_pipe(fd_pipe_err) == -1))
+    goto failed;
+
+  sp_ptr = NULL;
+  status = getpwnam_r (pl->user, &sp, nambuf, sizeof (nambuf), &sp_ptr);
   if (status != 0)
   {
-    ERROR ("exec plugin: pipe failed: %s",
-        sstrerror (errno, errbuf, sizeof (errbuf)));
-    return (-1);
+    ERROR ("exec plugin: Failed to get user information for user ``%s'': %s",
+        pl->user, sstrerror (errno, errbuf, sizeof (errbuf)));
+    goto failed;
   }
 
-  status = pipe (fd_pipe_out);
-  if (status != 0)
+  if (sp_ptr == NULL)
   {
-    ERROR ("exec plugin: pipe failed: %s",
-        sstrerror (errno, errbuf, sizeof (errbuf)));
-    return (-1);
+    ERROR ("exec plugin: No such user: `%s'", pl->user);
+    goto failed;
   }
 
-  status = pipe (fd_pipe_err);
-  if (status != 0)
+  uid = sp.pw_uid;
+  gid = sp.pw_gid;
+  if (uid == 0)
   {
-    ERROR ("exec plugin: pipe failed: %s",
-        sstrerror (errno, errbuf, sizeof (errbuf)));
-    return (-1);
+    ERROR ("exec plugin: Cowardly refusing to exec program as root.");
+    goto failed;
   }
 
+  /* The group configured in the configfile is set as effective group, because
+   * this way the forked process can (re-)gain the user's primary group. */
+  egid = -1;
+  if (NULL != pl->group)
+  {
+    if ('\0' != *pl->group) {
+      struct group *gr_ptr = NULL;
+      struct group gr;
+
+      status = getgrnam_r (pl->group, &gr, nambuf, sizeof (nambuf), &gr_ptr);
+      if (0 != status)
+      {
+        ERROR ("exec plugin: Failed to get group information "
+            "for group ``%s'': %s", pl->group,
+            sstrerror (errno, errbuf, sizeof (errbuf)));
+        goto failed;
+      }
+      if (NULL == gr_ptr)
+      {
+        ERROR ("exec plugin: No such group: `%s'", pl->group);
+        goto failed;
+      }
+
+      egid = gr.gr_gid;
+    }
+    else
+    {
+      egid = gid;
+    }
+  } /* if (pl->group == NULL) */
+
   pid = fork ();
   if (pid < 0)
   {
     ERROR ("exec plugin: fork failed: %s",
         sstrerror (errno, errbuf, sizeof (errbuf)));
-    return (-1);
+    goto failed;
   }
   else if (pid == 0)
   {
@@ -505,7 +514,7 @@ static int fork_child (program_list_t *pl, int *fd_in, int *fd_out, int *fd_err)
     /* Unblock all signals */
     reset_signal_mask ();
 
-    exec_child (pl);
+    exec_child (pl, uid, gid, egid);
     /* does not return */
   }
 
@@ -529,6 +538,13 @@ static int fork_child (program_list_t *pl, int *fd_in, int *fd_out, int *fd_err)
     close (fd_pipe_err[0]);
 
   return (pid);
+
+failed:
+  close_pipe(fd_pipe_in);
+  close_pipe(fd_pipe_out);
+  close_pipe(fd_pipe_err);
+
+  return (-1);
 } /* int fork_child }}} */
 
 static int parse_line (char *buffer) /* {{{ */