Logs from the child process (namespaced) are proxied to the parent

process

contain.c

@@ -347,8 +347,11 @@ bool containMakeFdsCOE(void)
 	return true;
 }
 
-bool containSetupFD(struct nsjconf_t * nsjconf, int fd_in, int fd_out, int fd_err)
+bool containSetupFD(struct nsjconf_t * nsjconf, int fd_in, int fd_out, int fd_err, int fd_log)
 {
+	/* Make sure all logs go to the parent process from now on */
+	logNewLogFD(fd_log);
+
 	if (nsjconf->mode != MODE_LISTEN_TCP) {
 		if (nsjconf->is_silent == false) {
 			return true;

contain.h

@@ -31,6 +31,6 @@ bool containPrepareEnv(struct nsjconf_t *nsjconf);
 bool containMountFS(struct nsjconf_t *nsjconf);
 bool containSetLimits(struct nsjconf_t *nsjconf);
 bool containMakeFdsCOE(void);
-bool containSetupFD(struct nsjconf_t *nsjconf, int fd_in, int fd_out, int fd_err);
+bool containSetupFD(struct nsjconf_t *nsjconf, int fd_in, int fd_out, int fd_err, int fd_log);
 
 #endif				/* _CONTAIN_H */

log.c

@@ -30,6 +30,7 @@
 #include <string.h>
 #include <sys/stat.h>
 #include <sys/types.h>
+#include <sys/syscall.h>
 #include <time.h>
 #include <unistd.h>
 
@@ -101,7 +102,7 @@ void logLog(enum llevel_t ll, const char *fn, int ln, bool perr, const char *fmt
 		dprintf(log_fd, "%s", logLevels[ll].prefix);
 	}
 	if (logLevels[ll].print_funcline) {
-		dprintf(log_fd, "[%s][%s][%d] %s():%d ", timestr, logLevels[ll].descr, getpid(), fn, ln);
+		dprintf(log_fd, "[%s][%s][%ld] %s():%d ", timestr, logLevels[ll].descr, syscall(__NR_getpid), fn, ln);
 	}
 
 	va_list args;
@@ -126,3 +127,13 @@ void logStop(int sig)
 {
 	LOG_I("Server stops due to fatal signal (%d) caught. Exiting", sig);
 }
+
+void logNewLogFD(int fd)
+{
+	log_fd = fd;
+}
+
+void logDirectly(const char *msg)
+{
+	dprintf(log_fd, "%s", msg);
+}

log.h

@@ -55,5 +55,7 @@ bool logInitLogFile(struct nsjconf_t *nsjconf, const char *logfile, bool is_verb
 void logLog(enum llevel_t ll, const char *fn, int ln, bool perr, const char *fmt, ...)
     __attribute__ ((format(printf, 5, 6)));
 void logStop(int sig);
+void logNewLogFD(int fd);
+void logDirectly(const char *msg);
 
 #endif				/* _LOG_H */

subproc.c

@@ -23,6 +23,7 @@
 
 #include <arpa/inet.h>
 #include <errno.h>
+#include <fcntl.h>
 #include <netinet/in.h>
 #include <sched.h>
 #include <signal.h>
@@ -44,12 +45,12 @@
 #include "net.h"
 #include "sandbox.h"
 
-static int subprocNewProc(struct nsjconf_t *nsjconf, int fd_in, int fd_out, int fd_err)
+static int subprocNewProc(struct nsjconf_t *nsjconf, int fd_in, int fd_out, int fd_err, int pipefd)
 {
 	if (containPrepareEnv(nsjconf) == false) {
 		exit(1);
 	}
-	if (containSetupFD(nsjconf, fd_in, fd_out, fd_err) == false) {
+	if (containSetupFD(nsjconf, fd_in, fd_out, fd_err, pipefd) == false) {
 		exit(1);
 	}
 	if (containMountFS(nsjconf) == false) {
@@ -81,8 +82,10 @@ static int subprocNewProc(struct nsjconf_t *nsjconf, int fd_in, int fd_out, int
 		LOG_D(" Arg[%d]: '%s'", i, nsjconf->argv[i]);
 	}
 	execve(nsjconf->argv[0], &nsjconf->argv[0], env);
-	PLOG_F("execve('%s')", nsjconf->argv[0]);
+
-	exit(1);
+	PLOG_E("execve('%s') failed", nsjconf->argv[0]);
+
+	_exit(1);
 }
 
 static void subprocAdd(struct nsjconf_t *nsjconf, pid_t pid, int sock)
@@ -135,7 +138,9 @@ void subprocDisplay(struct nsjconf_t *nsjconf)
 	struct pids_t *p;
 	LIST_FOREACH(p, &nsjconf->pids, pointers) {
 		time_t diff = now - p->start;
-		LOG_I("PID: %d, Remote host: %s, Run time: %ld sec.", p->pid, p->remote_txt, (long)diff);
+		time_t left = nsjconf->tlimit ? nsjconf->tlimit - diff : 0;
+		LOG_I("PID: %d, Remote host: %s, Run time: %ld sec. (time left: %ld sec.)", p->pid, p->remote_txt,
+		      (long)diff, (long)left);
 	}
 }
 
@@ -201,9 +206,15 @@ void subprocRunChild(struct nsjconf_t *nsjconf, int fd_in, int fd_out, int fd_er
 
 	LOG_D("Creating new process with clone flags: %#x", flags);
 
+	int pipefd[2];
+	if (pipe2(pipefd, O_CLOEXEC) == -1) {
+		PLOG_E("pipe2(pipefd, O_CLOEXEC) failed");
+		return;
+	}
+
 	pid_t pid = syscall(__NR_clone, flags, NULL, NULL, NULL, 0);
 	if (pid == 0) {
-		subprocNewProc(nsjconf, fd_in, fd_out, fd_err);
+		subprocNewProc(nsjconf, fd_in, fd_out, fd_err, pipefd[1]);
 	}
 	if (pid == -1) {
 		PLOG_E("clone(flags=%#x) failed. You probably need root privileges if your system "
@@ -212,6 +223,16 @@ void subprocRunChild(struct nsjconf_t *nsjconf, int fd_in, int fd_out, int fd_er
 		return;
 	}
 
+	char log_buf[4096];
+
+	ssize_t sz;
+	while ((sz = read(pipefd[0], log_buf, sizeof(log_buf) - 1)) > 0) {
+		log_buf[sz] = '\0';
+		logDirectly(log_buf);
+	}
+	close(pipefd[0]);
+	close(pipefd[1]);
+
 	subprocAdd(nsjconf, pid, fd_in);
 
 	char cs_addr[64];