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/*-
* Copyright (c) 2006 Verdens Gang AS
* Copyright (c) 2006-2011 Varnish Software AS
* All rights reserved.
*
* Author: Poul-Henning Kamp <phk@phk.freebsd.dk>
*
* SPDX-License-Identifier: BSD-2-Clause
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Run stuff in a child process
*/
#include "config.h"
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h> // Solaris closefrom(3c)
#include <string.h>
#include <unistd.h> // BSD/Linux close_range(2)
#ifndef HAVE_CLOSEFROM
# include <dirent.h>
#endif
#include "vdef.h"
#include "vapi/vsig.h"
#include "vas.h"
#include "vfil.h"
#include "vlu.h"
#include "vsb.h"
#include "vsub.h"
struct vsub_priv {
const char *name;
struct vsb *sb;
int lines;
int maxlines;
};
void
VSUB_closefrom(int fd)
{
assert(fd >= 0);
#ifdef HAVE_CLOSEFROM
closefrom(fd);
return;
#else
# ifdef HAVE_WORKING_CLOSE_RANGE
if (close_range(fd, ~0U, 0) == 0)
return;
# endif
char buf[128];
int i, maxfd = 0;
DIR *d;
struct dirent *de;
char *p;
bprintf(buf, "/proc/%d/fd/", getpid());
d = opendir(buf);
if (d != NULL) {
while (1) {
de = readdir(d);
if (de == NULL)
break;
i = strtoul(de->d_name, &p, 10);
if (*p != '\0')
continue;
if (i > maxfd)
maxfd = i;
}
AZ(closedir(d));
}
if (maxfd == 0)
maxfd = sysconf(_SC_OPEN_MAX);
assert(maxfd > 0);
for (; maxfd > fd; maxfd--)
(void)close(maxfd);
#endif
}
static int
vsub_vlu(void *priv, const char *str)
{
struct vsub_priv *sp;
sp = priv;
if (!sp->lines++)
VSB_printf(sp->sb, "Message from %s:\n", sp->name);
if (sp->maxlines < 0 || sp->lines <= sp->maxlines)
VSB_printf(sp->sb, "%s\n", str);
return (0);
}
/* returns an exit code */
unsigned
VSUB_run(struct vsb *sb, vsub_func_f *func, void *priv, const char *name,
int maxlines)
{
int rv, p[2], status;
pid_t pid;
struct vsub_priv sp;
sp.sb = sb;
sp.name = name;
sp.lines = 0;
sp.maxlines = maxlines;
if (pipe(p) < 0) {
VSB_printf(sb, "Starting %s: pipe() failed: %s",
name, strerror(errno));
return (1);
}
assert(p[0] > STDERR_FILENO);
assert(p[1] > STDERR_FILENO);
if ((pid = fork()) < 0) {
VSB_printf(sb, "Starting %s: fork() failed: %s",
name, strerror(errno));
closefd(&p[0]);
closefd(&p[1]);
return (1);
}
if (pid == 0) {
VFIL_null_fd(STDIN_FILENO);
assert(dup2(p[1], STDOUT_FILENO) == STDOUT_FILENO);
assert(dup2(p[1], STDERR_FILENO) == STDERR_FILENO);
/* Close all other fds */
VSUB_closefrom(STDERR_FILENO + 1);
func(priv);
/*
* func should either exec or exit, so getting here should be
* treated like an assertion failure - except that we don't know
* if it's safe to trigger an actual assertion
*/
_exit(4);
}
closefd(&p[1]);
(void)VLU_File(p[0], vsub_vlu, &sp, 0);
closefd(&p[0]);
if (sp.maxlines >= 0 && sp.lines > sp.maxlines)
VSB_printf(sb, "[%d lines truncated]\n",
sp.lines - sp.maxlines);
do {
rv = waitpid(pid, &status, 0);
if (rv < 0 && errno != EINTR) {
VSB_printf(sb, "Running %s: waitpid() failed: %s\n",
name, strerror(errno));
return (1);
}
} while (rv < 0);
if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
rv = -1;
VSB_printf(sb, "Running %s failed", name);
if (WIFEXITED(status)) {
rv = WEXITSTATUS(status);
VSB_printf(sb, ", exited with %d", rv);
}
if (WIFSIGNALED(status)) {
rv = 2;
VSB_printf(sb, ", signal %d", WTERMSIG(status));
}
if (WCOREDUMP(status))
VSB_cat(sb, ", core dumped");
VSB_cat(sb, "\n");
assert(rv != -1);
return (rv);
}
return (0);
}
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