Date: Thu, 21 Feb 2019 06:40:15 +0000 (UTC) From: "Jason A. Harmening" <jah@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-12@freebsd.org Subject: svn commit: r344422 - stable/12/lib/libcasper/services/cap_syslog Message-ID: <201902210640.x1L6eFVQ008433@repo.freebsd.org>
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Author: jah Date: Thu Feb 21 06:40:15 2019 New Revision: 344422 URL: https://svnweb.freebsd.org/changeset/base/344422 Log: MFC r343827: r342089 changed cap_syslog(3) to preserve the stdio descriptors inherited from its parent so that LOG_PERROR would work. However, this caused dhclient(8)'s stdio streams to remain open across daemonization, breaking the ability to capture its foreground output as done in netconfig_ipv4. Fix this by reverting r341692 and instead passing the parent's stderr descriptor as an argument to cap_openlog() only when LOG_PERROR is specified in logopt. PR: 234514 Modified: stable/12/lib/libcasper/services/cap_syslog/cap_syslog.c Directory Properties: stable/12/ (props changed) Modified: stable/12/lib/libcasper/services/cap_syslog/cap_syslog.c ============================================================================== --- stable/12/lib/libcasper/services/cap_syslog/cap_syslog.c Thu Feb 21 06:02:51 2019 (r344421) +++ stable/12/lib/libcasper/services/cap_syslog/cap_syslog.c Thu Feb 21 06:40:15 2019 (r344422) @@ -88,6 +88,9 @@ cap_openlog(cap_channel_t *chan, const char *ident, in } nvlist_add_number(nvl, "logopt", logopt); nvlist_add_number(nvl, "facility", facility); + if (logopt & LOG_PERROR) { + nvlist_add_descriptor(nvl, "stderr", STDERR_FILENO); + } nvl = cap_xfer_nvlist(chan, nvl); if (nvl == NULL) { return; @@ -131,6 +134,7 @@ cap_setlogmask(cap_channel_t *chan, int maskpri) */ static char *LogTag; +static int prev_stderr = -1; static void slog_vsyslog(const nvlist_t *limits __unused, const nvlist_t *nvlin, @@ -146,6 +150,8 @@ slog_openlog(const nvlist_t *limits __unused, const nv nvlist_t *nvlout __unused) { const char *ident; + uint64_t logopt; + int stderr_fd; ident = dnvlist_get_string(nvlin, "ident", NULL); if (ident != NULL) { @@ -153,8 +159,19 @@ slog_openlog(const nvlist_t *limits __unused, const nv LogTag = strdup(ident); } - openlog(LogTag, nvlist_get_number(nvlin, "logopt"), - nvlist_get_number(nvlin, "facility")); + logopt = nvlist_get_number(nvlin, "logopt"); + if (logopt & LOG_PERROR) { + stderr_fd = dnvlist_get_descriptor(nvlin, "stderr", -1); + if (prev_stderr == -1) + prev_stderr = dup(STDERR_FILENO); + if (prev_stderr != -1) + (void)dup2(stderr_fd, STDERR_FILENO); + } else if (prev_stderr != -1) { + (void)dup2(prev_stderr, STDERR_FILENO); + close(prev_stderr); + prev_stderr = -1; + } + openlog(LogTag, logopt, nvlist_get_number(nvlin, "facility")); } static void @@ -166,6 +183,12 @@ slog_closelog(const nvlist_t *limits __unused, const n free(LogTag); LogTag = NULL; + + if (prev_stderr != -1) { + (void)dup2(prev_stderr, STDERR_FILENO); + close(prev_stderr); + prev_stderr = -1; + } } static void @@ -198,4 +221,4 @@ syslog_command(const char *cmd, const nvlist_t *limits return (0); } -CREATE_SERVICE("system.syslog", NULL, syslog_command, CASPER_SERVICE_STDIO); +CREATE_SERVICE("system.syslog", NULL, syslog_command, 0);
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