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/*
* Copyright 2003-2024 Gentoo Foundation
* Distributed under the terms of the GNU General Public License v2
*
* Copyright 2005-2012 Ned Ludd - <solar@gentoo.org>
* Copyright 2005-2024 Mike Frysinger - <vapier@gentoo.org>
*/
/* stick common symbols here that are needed by paxinc.h */
#define IN_paxinc
#include "paxinc.h"
char do_reverse_endian;
/* some of this ar code was taken from busybox */
#define AR_MAGIC "!<arch>"
#define AR_MAGIC_SIZE (sizeof(AR_MAGIC)-1) /* dont count null byte */
archive_handle *ar_open_fd(const char *filename, int fd, bool verbose)
{
static archive_handle ret;
char buf[AR_MAGIC_SIZE];
ret.filename = filename;
ret.fd = fd;
ret.skip = 0;
ret.extfn = NULL;
ret.verbose = verbose;
if (read(ret.fd, buf, AR_MAGIC_SIZE) != AR_MAGIC_SIZE)
return NULL;
if (strncmp(buf, AR_MAGIC, AR_MAGIC_SIZE))
return NULL;
return &ret;
}
archive_handle *ar_open(const char *filename, bool verbose)
{
int fd;
archive_handle *ret;
if ((fd=open(filename, O_RDONLY)) == -1)
errp("%s: could not open", filename);
ret = ar_open_fd(filename, fd, verbose);
if (ret == NULL)
close(fd);
return ret;
}
archive_member *ar_next(archive_handle *ar)
{
char *s;
ssize_t len = 0;
static archive_member ret;
if (ar->skip && lseek(ar->fd, ar->skip, SEEK_CUR) == -1) {
close_and_ret:
free(ar->extfn);
close(ar->fd);
ar->extfn = NULL;
ar->fd = -1;
return NULL;
}
if (read(ar->fd, ret.buf.raw, sizeof(ret.buf.raw)) != sizeof(ret.buf.raw))
goto close_and_ret;
/* ar header starts on an even byte (2 byte aligned)
* '\n' is used for padding */
if (ret.buf.raw[0] == '\n') {
memmove(ret.buf.raw, ret.buf.raw+1, 59);
if (read(ar->fd, ret.buf.raw+59, 1) != 1)
goto close_and_ret;
}
if ((ret.buf.formatted.magic[0] != '`') || (ret.buf.formatted.magic[1] != '\n')) {
/* When dealing with corrupt or random embedded cross-compilers, they might
* be abusing the archive format; only complain when in verbose mode. */
if (ar->verbose)
warn("%s: invalid ar entry", ar->filename);
goto close_and_ret;
}
if (ret.buf.formatted.name[0] == '/' && ret.buf.formatted.name[1] == '/') {
if (ar->extfn != NULL) {
warn("%s: Duplicate GNU extended filename section", ar->filename);
goto close_and_ret;
}
len = atoi(ret.buf.formatted.size);
ar->extfn = xmalloc(sizeof(char) * (len + 1));
if (read(ar->fd, ar->extfn, len) != len)
goto close_and_ret;
ar->extfn[len--] = '\0';
for (; len > 0; len--)
if (ar->extfn[len] == '\n')
ar->extfn[len] = '\0';
ar->skip = 0;
return ar_next(ar);
}
s = ret.buf.formatted.name;
if (s[0] == '#' && s[1] == '1' && s[2] == '/') {
/* BSD extended filename, always in use on Darwin */
len = atoi(s + 3);
if (len <= (ssize_t)sizeof(ret.buf.formatted.name)) {
if (read(ar->fd, ret.buf.formatted.name, len) != len)
goto close_and_ret;
} else {
s = alloca(sizeof(char) * len + 1);
if (read(ar->fd, s, len) != len)
goto close_and_ret;
s[len] = '\0';
}
} else if (s[0] == '/' && s[1] >= '0' && s[1] <= '9') {
/* GNU extended filename */
if (ar->extfn == NULL) {
warn("%s: GNU extended filename without special data section", ar->filename);
goto close_and_ret;
}
s = ar->extfn + atoi(s + 1);
}
snprintf(ret.name, sizeof(ret.name), "%s:%s", ar->filename, s);
ret.name[sizeof(ret.name) - 1] = '\0';
if ((s=strchr(ret.name+strlen(ar->filename), '/')) != NULL)
*s = '\0';
ret.date = atoi(ret.buf.formatted.date);
ret.uid = atoi(ret.buf.formatted.uid);
ret.gid = atoi(ret.buf.formatted.gid);
ret.mode = strtol(ret.buf.formatted.mode, NULL, 8);
ret.size = atoi(ret.buf.formatted.size);
ar->skip = ret.size - len;
return &ret;
}
/* Convert file perms into octal string */
const char *strfileperms(const char *fname)
{
struct stat st;
static char buf[8];
if (stat(fname, &st) == -1)
return "";
snprintf(buf, sizeof(buf), "%o", st.st_mode);
return buf + 2;
}
/* Color helpers */
#define COLOR(c,b) "\e[" c ";" b "m"
const char *NORM = COLOR("00", "00");
const char *RED = COLOR("31", "01");
const char *YELLOW = COLOR("33", "01");
void color_init(bool disable)
{
if (!disable) {
const char *nocolor = getenv("NOCOLOR");
if (nocolor)
disable = !strcmp(nocolor, "yes") || !strcmp(nocolor, "true");
}
if (disable)
NORM = RED = YELLOW = "";
}
/* File system helpers. */
int root_fd = AT_FDCWD;
FILE *fopenat_r(int dir_fd, const char *path)
{
int fd = openat(dir_fd, path, O_RDONLY|O_CLOEXEC);
if (fd == -1)
return NULL;
return fdopen(fd, "re");
}
const char *root_rel_path(const char *path)
{
/*
* openat() will ignore the dirfd if path starts with
* a /, so consume all of that noise
*
* XXX: we don't handle relative paths like ../ that
* break out of the --root option, but for now, just
* don't do that :P.
*/
if (root_fd != AT_FDCWD) {
while (*path == '/')
++path;
if (*path == '\0')
path = ".";
}
return path;
}
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