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From 70ed51ccc2e8e6c4976d422af960e4232210fb99 Mon Sep 17 00:00:00 2001
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From: Karel Zak <kzak@redhat.com>
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Date: Mon, 16 Oct 2017 13:31:47 +0200
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Subject: [PATCH 134/135] logger: do not rely only getlogin(3) telling who ran
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the command
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The getlogin(3) is known not to always work, and when that happens it
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is reasonable to try determine user of name by looking process owner
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and passwd information.
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Upstream: http://github.com/karelzak/util-linux/commit/019b97024fde3f07eaf541eef990762483369a11
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Addresses: https://bugzilla.redhat.com/show_bug.cgi?id=1336432
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Signed-off-by: Karel Zak <kzak@redhat.com>
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---
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misc-utils/logger.c | 25 ++++++++++++++++---------
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1 file changed, 16 insertions(+), 9 deletions(-)
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diff --git a/misc-utils/logger.c b/misc-utils/logger.c
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index dfda01866..c1cec45e8 100644
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--- a/misc-utils/logger.c
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+++ b/misc-utils/logger.c
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@@ -49,6 +49,8 @@
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <getopt.h>
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+#include <sys/types.h>
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+#include <pwd.h>
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#include "c.h"
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#include "closestream.h"
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@@ -183,9 +185,20 @@ inet_socket(const char *servername, const char *port, const int socket_type)
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return fd;
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}
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+static char const *xgetlogin(void)
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+{
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+ char const *cp;
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+ struct passwd *pw;
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+
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+ if (!(cp = getlogin()) || !*cp)
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+ cp = (pw = getpwuid(geteuid()))? pw->pw_name : "<someone>";
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+ return cp;
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+}
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+
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static void
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mysyslog(int fd, int logflags, int pri, char *tag, char *msg) {
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- char *buf, pid[30], *cp, *tp;
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+ char *buf, pid[30], *tp;
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+ const char *cp;
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time_t now;
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if (fd > -1) {
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@@ -193,13 +206,7 @@ mysyslog(int fd, int logflags, int pri, char *tag, char *msg) {
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snprintf (pid, sizeof(pid), "[%d]", getpid());
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else
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pid[0] = 0;
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- if (tag)
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- cp = tag;
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- else {
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- cp = getlogin();
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- if (!cp)
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- cp = "<someone>";
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- }
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+ cp = tag ? tag : xgetlogin();
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(void)time(&now;;
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tp = ctime(&now)+4;
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@@ -334,7 +341,7 @@ main(int argc, char **argv) {
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else if (usock)
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LogSock = unix_socket(usock, socket_type);
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else
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- openlog(tag ? tag : getlogin(), logflags, 0);
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+ openlog(tag ? tag : xgetlogin(), logflags, 0);
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buf = xcalloc(1, max_message_size);
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--
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2.13.6
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