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/*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*/

/*
* Copyright 2011 Jason King. All rights reserved.
*/

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <fcntl.h>
#include <err.h>
#include <spawn.h>

#define MCS "/usr/bin/mcs"

#define ELFLEN 4
static const char elf_signature[] = "\177ELF";
static posix_spawnattr_t attr;
static const char *cmd[] = { MCS, "-d", "-n", ".SUNW_ctf", NULL, NULL };

extern char **environ;

static boolean_t check_file(const char *, mode_t *);
static boolean_t fix_file(const char *, mode_t);
static void usage(const char *);

int
main(int argc, const char **argv)
{
const char **p;
int rc = 0;
mode_t mode;

if (argc < 2)
usage(argv[0]);

rc = posix_spawnattr_init(&attr);
if (rc != 0) {
errx(EXIT_FAILURE, "Spawn attribute initialization failed: %s",
strerror(rc));
}

for (p = argv + 1; *p != NULL; p++) {
if (!check_file(*p, &mode))
continue;
if (!fix_file(*p, mode))
rc = 1;
}

return (rc);
}

static boolean_t
check_file(const char *filename, mode_t *mode)
{
char elfbuf[4];
struct stat sb;
int fd;

fd = open(filename, O_RDONLY);
if (fd == -1) {
warn("Unable to open %s", filename);
return (B_FALSE);
}

if (fstat(fd, &sb) == -1) {
warn("stat(2) failed on %s", filename);
(void) close(fd);
return (B_FALSE);
}

if (!S_ISREG(sb.st_mode)) {
warnx("%s is not a regular file", filename);
(void) close(fd);
return (B_FALSE);
}

if (sb.st_size < ELFLEN) {
warnx("%s is not an ELF file", filename);
(void) close(fd);
return (B_FALSE);
}

if (read(fd, elfbuf, ELFLEN) != ELFLEN) {
warn("Error reading %s", filename);
(void) close(fd);
return (B_FALSE);
}

if (strncmp(elfbuf, elf_signature, ELFLEN) != 0) {
warnx("%s is not an ELF file", filename);
(void) close(fd);
return (B_FALSE);
}

*mode = sb.st_mode & S_IAMB;
(void) close(fd);
return (B_TRUE);
}

static boolean_t
fix_file(const char *filename, mode_t mode)
{
pid_t pid;
int i, rc;
int stat = 0;

if ((mode & S_IWUSR) == 0) {
if (chmod(filename, mode | S_IWUSR) == -1) {
warn("failed to make %s writable", filename);
return (B_FALSE);
}
}

cmd[4] = filename;
if ((rc = posix_spawn(&pid, MCS, NULL, &attr, (char *const *)cmd, environ)) != 0) {
warnx("could not exec mcs: %s", strerror(rc));
return (B_FALSE);
}

waitpid(pid, &stat, 0);
if (!WIFEXITED(stat) || WEXITSTATUS(stat) != 0) {
warnx("Removing CTF information from %s failed", filename);
return (B_FALSE);
}

if ((mode & S_IWUSR) == 0) {
if (chmod(filename, mode) == -1) {
warn("could not reset permissions of %s", filename);
return (B_FALSE);
}
}

return (B_TRUE);
}

static void
usage(const char *name)
{
(void) fprintf(stderr, "Usage: %s file...\n", name);
exit(EXIT_FAILURE);
}
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