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scp.c
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/* $OpenBSD: scp.c,v 1.261 2024/06/26 23:14:14 deraadt Exp $ */
/*
* scp - secure remote copy. This is basically patched BSD rcp which
* uses ssh to do the data transfer (instead of using rcmd).
*
* NOTE: This version should NOT be suid root. (This uses ssh to
* do the transfer and ssh has the necessary privileges.)
*
* 1995 Timo Rinne <[email protected]>, Tatu Ylonen <[email protected]>
*
* As far as I am concerned, the code I have written for this software
* can be used freely for any purpose. Any derived versions of this
* software must be clearly marked as such, and if the derived work is
* incompatible with the protocol description in the RFC file, it must be
* called by a name other than "ssh" or "Secure Shell".
*/
/*
* Copyright (c) 1999 Theo de Raadt. All rights reserved.
* Copyright (c) 1999 Aaron Campbell. All rights reserved.
*
* 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 ``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 THE AUTHOR 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.
*/
/*
* Parts from:
*
* Copyright (c) 1983, 1990, 1992, 1993, 1995
* The Regents of the University of California. All rights reserved.
*
* 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.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 THE REGENTS 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.
*
*/
#include "includes.h"
#include <sys/types.h>
#ifdef HAVE_SYS_STAT_H
# include <sys/stat.h>
#endif
#ifdef HAVE_POLL_H
#include <poll.h>
#else
# ifdef HAVE_SYS_POLL_H
# include <sys/poll.h>
# endif
#endif
#ifdef HAVE_SYS_TIME_H
# include <sys/time.h>
#endif
#include <sys/wait.h>
#include <sys/uio.h>
#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#ifdef HAVE_FNMATCH_H
#include <fnmatch.h>
#endif
#ifdef USE_SYSTEM_GLOB
# include <glob.h>
#else
# include "openbsd-compat/glob.h"
#endif
#ifdef HAVE_LIBGEN_H
#include <libgen.h>
#endif
#include <limits.h>
#ifdef HAVE_UTIL_H
# include <util.h>
#endif
#include <locale.h>
#include <pwd.h>
#include <signal.h>
#include <stdarg.h>
#ifdef HAVE_STDINT_H
# include <stdint.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#if defined(HAVE_STRNVIS) && defined(HAVE_VIS_H) && !defined(BROKEN_STRNVIS)
#include <vis.h>
#endif
#include "xmalloc.h"
#include "ssh.h"
#include "atomicio.h"
#include "pathnames.h"
#include "log.h"
#include "misc.h"
#include "progressmeter.h"
#include "utf8.h"
#include "sftp.h"
#include "sftp-common.h"
#include "sftp-client.h"
extern char *__progname;
#define COPY_BUFLEN 16384
int do_cmd(char *, char *, char *, int, int, char *, int *, int *, pid_t *);
int do_cmd2(char *, char *, int, char *, int, int);
/* Struct for addargs */
arglist args;
arglist remote_remote_args;
/* Bandwidth limit */
long long limit_kbps = 0;
struct bwlimit bwlimit;
/* Name of current file being transferred. */
char *curfile;
/* This is set to non-zero to enable verbose mode. */
int verbose_mode = 0;
LogLevel log_level = SYSLOG_LEVEL_INFO;
/* This is set to zero if the progressmeter is not desired. */
int showprogress = 1;
/*
* This is set to non-zero if remote-remote copy should be piped
* through this process.
*/
int throughlocal = 1;
/* Non-standard port to use for the ssh connection or -1. */
int sshport = -1;
/* This is the program to execute for the secured connection. ("ssh" or -S) */
char *ssh_program = _PATH_SSH_PROGRAM;
/* This is used to store the pid of ssh_program */
pid_t do_cmd_pid = -1;
pid_t do_cmd_pid2 = -1;
/* SFTP copy parameters */
size_t sftp_copy_buflen;
size_t sftp_nrequests;
/* Needed for sftp */
volatile sig_atomic_t interrupted = 0;
int sftp_glob(struct sftp_conn *, const char *, int,
int (*)(const char *, int), glob_t *); /* proto for sftp-glob.c */
static void
killchild(int signo)
{
if (do_cmd_pid > 1) {
kill(do_cmd_pid, signo ? signo : SIGTERM);
(void)waitpid(do_cmd_pid, NULL, 0);
}
if (do_cmd_pid2 > 1) {
kill(do_cmd_pid2, signo ? signo : SIGTERM);
(void)waitpid(do_cmd_pid2, NULL, 0);
}
if (signo)
_exit(1);
exit(1);
}
static void
suspone(int pid, int signo)
{
int status;
if (pid > 1) {
kill(pid, signo);
while (waitpid(pid, &status, WUNTRACED) == -1 &&
errno == EINTR)
;
}
}
static void
suspchild(int signo)
{
int save_errno = errno;
suspone(do_cmd_pid, signo);
suspone(do_cmd_pid2, signo);
kill(getpid(), SIGSTOP);
errno = save_errno;
}
static int
do_local_cmd(arglist *a)
{
u_int i;
int status;
pid_t pid;
if (a->num == 0)
fatal("do_local_cmd: no arguments");
if (verbose_mode) {
fprintf(stderr, "Executing:");
for (i = 0; i < a->num; i++)
fmprintf(stderr, " %s", a->list[i]);
fprintf(stderr, "\n");
}
if ((pid = fork()) == -1)
fatal("do_local_cmd: fork: %s", strerror(errno));
if (pid == 0) {
execvp(a->list[0], a->list);
perror(a->list[0]);
exit(1);
}
do_cmd_pid = pid;
ssh_signal(SIGTERM, killchild);
ssh_signal(SIGINT, killchild);
ssh_signal(SIGHUP, killchild);
while (waitpid(pid, &status, 0) == -1)
if (errno != EINTR)
fatal("do_local_cmd: waitpid: %s", strerror(errno));
do_cmd_pid = -1;
if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
return (-1);
return (0);
}
/*
* This function executes the given command as the specified user on the
* given host. This returns < 0 if execution fails, and >= 0 otherwise. This
* assigns the input and output file descriptors on success.
*/
int
do_cmd(char *program, char *host, char *remuser, int port, int subsystem,
char *cmd, int *fdin, int *fdout, pid_t *pid)
{
#ifdef USE_PIPES
int pin[2], pout[2];
#else
int sv[2];
#endif
if (verbose_mode)
fmprintf(stderr,
"Executing: program %s host %s, user %s, command %s\n",
program, host,
remuser ? remuser : "(unspecified)", cmd);
if (port == -1)
port = sshport;
#ifdef USE_PIPES
if (pipe(pin) == -1 || pipe(pout) == -1)
fatal("pipe: %s", strerror(errno));
#else
/* Create a socket pair for communicating with ssh. */
if (socketpair(AF_UNIX, SOCK_STREAM, 0, sv) == -1)
fatal("socketpair: %s", strerror(errno));
#endif
ssh_signal(SIGTSTP, suspchild);
ssh_signal(SIGTTIN, suspchild);
ssh_signal(SIGTTOU, suspchild);
/* Fork a child to execute the command on the remote host using ssh. */
*pid = fork();
switch (*pid) {
case -1:
fatal("fork: %s", strerror(errno));
case 0:
/* Child. */
#ifdef USE_PIPES
if (dup2(pin[0], STDIN_FILENO) == -1 ||
dup2(pout[1], STDOUT_FILENO) == -1) {
error("dup2: %s", strerror(errno));
_exit(1);
}
close(pin[0]);
close(pin[1]);
close(pout[0]);
close(pout[1]);
#else
if (dup2(sv[0], STDIN_FILENO) == -1 ||
dup2(sv[0], STDOUT_FILENO) == -1) {
error("dup2: %s", strerror(errno));
_exit(1);
}
close(sv[0]);
close(sv[1]);
#endif
replacearg(&args, 0, "%s", program);
if (port != -1) {
addargs(&args, "-p");
addargs(&args, "%d", port);
}
if (remuser != NULL) {
addargs(&args, "-l");
addargs(&args, "%s", remuser);
}
if (subsystem)
addargs(&args, "-s");
addargs(&args, "--");
addargs(&args, "%s", host);
addargs(&args, "%s", cmd);
execvp(program, args.list);
perror(program);
_exit(1);
default:
/* Parent. Close the other side, and return the local side. */
#ifdef USE_PIPES
close(pin[0]);
close(pout[1]);
*fdout = pin[1];
*fdin = pout[0];
#else
close(sv[0]);
*fdin = sv[1];
*fdout = sv[1];
#endif
ssh_signal(SIGTERM, killchild);
ssh_signal(SIGINT, killchild);
ssh_signal(SIGHUP, killchild);
return 0;
}
}
/*
* This function executes a command similar to do_cmd(), but expects the
* input and output descriptors to be setup by a previous call to do_cmd().
* This way the input and output of two commands can be connected.
*/
int
do_cmd2(char *host, char *remuser, int port, char *cmd,
int fdin, int fdout)
{
int status;
pid_t pid;
if (verbose_mode)
fmprintf(stderr,
"Executing: 2nd program %s host %s, user %s, command %s\n",
ssh_program, host,
remuser ? remuser : "(unspecified)", cmd);
if (port == -1)
port = sshport;
/* Fork a child to execute the command on the remote host using ssh. */
pid = fork();
if (pid == 0) {
if (dup2(fdin, 0) == -1)
perror("dup2");
if (dup2(fdout, 1) == -1)
perror("dup2");
replacearg(&args, 0, "%s", ssh_program);
if (port != -1) {
addargs(&args, "-p");
addargs(&args, "%d", port);
}
if (remuser != NULL) {
addargs(&args, "-l");
addargs(&args, "%s", remuser);
}
addargs(&args, "-oBatchMode=yes");
addargs(&args, "--");
addargs(&args, "%s", host);
addargs(&args, "%s", cmd);
execvp(ssh_program, args.list);
perror(ssh_program);
exit(1);
} else if (pid == -1) {
fatal("fork: %s", strerror(errno));
}
while (waitpid(pid, &status, 0) == -1)
if (errno != EINTR)
fatal("do_cmd2: waitpid: %s", strerror(errno));
return 0;
}
typedef struct {
size_t cnt;
char *buf;
} BUF;
BUF *allocbuf(BUF *, int, int);
void lostconn(int);
int okname(char *);
void run_err(const char *,...)
__attribute__((__format__ (printf, 1, 2)))
__attribute__((__nonnull__ (1)));
int note_err(const char *,...)
__attribute__((__format__ (printf, 1, 2)));
void verifydir(char *);
struct passwd *pwd;
uid_t userid;
int errs, remin, remout, remin2, remout2;
int Tflag, pflag, iamremote, iamrecursive, targetshouldbedirectory;
#define CMDNEEDS 64
char cmd[CMDNEEDS]; /* must hold "rcp -r -p -d\0" */
enum scp_mode_e {
MODE_SCP,
MODE_SFTP
};
int response(void);
void rsource(char *, struct stat *);
void sink(int, char *[], const char *);
void source(int, char *[]);
void tolocal(int, char *[], enum scp_mode_e, char *sftp_direct);
void toremote(int, char *[], enum scp_mode_e, char *sftp_direct);
void usage(void);
void source_sftp(int, char *, char *, struct sftp_conn *);
void sink_sftp(int, char *, const char *, struct sftp_conn *);
void throughlocal_sftp(struct sftp_conn *, struct sftp_conn *,
char *, char *);
int
main(int argc, char **argv)
{
int ch, fflag, tflag, status, r, n;
char **newargv, *argv0;
const char *errstr;
extern char *optarg;
extern int optind;
enum scp_mode_e mode = MODE_SFTP;
char *sftp_direct = NULL;
long long llv;
/* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
sanitise_stdfd();
msetlocale();
/* Copy argv, because we modify it */
argv0 = argv[0];
newargv = xcalloc(MAXIMUM(argc + 1, 1), sizeof(*newargv));
for (n = 0; n < argc; n++)
newargv[n] = xstrdup(argv[n]);
argv = newargv;
__progname = ssh_get_progname(argv[0]);
log_init(argv0, log_level, SYSLOG_FACILITY_USER, 2);
memset(&args, '\0', sizeof(args));
memset(&remote_remote_args, '\0', sizeof(remote_remote_args));
args.list = remote_remote_args.list = NULL;
addargs(&args, "%s", ssh_program);
addargs(&args, "-x");
addargs(&args, "-oPermitLocalCommand=no");
addargs(&args, "-oClearAllForwardings=yes");
addargs(&args, "-oRemoteCommand=none");
addargs(&args, "-oRequestTTY=no");
fflag = Tflag = tflag = 0;
while ((ch = getopt(argc, argv,
"12346ABCTdfOpqRrstvD:F:J:M:P:S:c:i:l:o:X:")) != -1) {
switch (ch) {
/* User-visible flags. */
case '1':
fatal("SSH protocol v.1 is no longer supported");
break;
case '2':
/* Ignored */
break;
case 'A':
case '4':
case '6':
case 'C':
addargs(&args, "-%c", ch);
addargs(&remote_remote_args, "-%c", ch);
break;
case 'D':
sftp_direct = optarg;
break;
case '3':
throughlocal = 1;
break;
case 'R':
throughlocal = 0;
break;
case 'o':
case 'c':
case 'i':
case 'F':
case 'J':
addargs(&remote_remote_args, "-%c", ch);
addargs(&remote_remote_args, "%s", optarg);
addargs(&args, "-%c", ch);
addargs(&args, "%s", optarg);
break;
case 'O':
mode = MODE_SCP;
break;
case 's':
mode = MODE_SFTP;
break;
case 'P':
sshport = a2port(optarg);
if (sshport <= 0)
fatal("bad port \"%s\"\n", optarg);
break;
case 'B':
addargs(&remote_remote_args, "-oBatchmode=yes");
addargs(&args, "-oBatchmode=yes");
break;
case 'l':
limit_kbps = strtonum(optarg, 1, 100 * 1024 * 1024,
&errstr);
if (errstr != NULL)
usage();
limit_kbps *= 1024; /* kbps */
bandwidth_limit_init(&bwlimit, limit_kbps, COPY_BUFLEN);
break;
case 'p':
pflag = 1;
break;
case 'r':
iamrecursive = 1;
break;
case 'S':
ssh_program = xstrdup(optarg);
break;
case 'v':
addargs(&args, "-v");
addargs(&remote_remote_args, "-v");
if (verbose_mode == 0)
log_level = SYSLOG_LEVEL_DEBUG1;
else if (log_level < SYSLOG_LEVEL_DEBUG3)
log_level++;
verbose_mode = 1;
break;
case 'q':
addargs(&args, "-q");
addargs(&remote_remote_args, "-q");
showprogress = 0;
break;
case 'X':
/* Please keep in sync with sftp.c -X */
if (strncmp(optarg, "buffer=", 7) == 0) {
r = scan_scaled(optarg + 7, &llv);
if (r == 0 && (llv <= 0 || llv > 256 * 1024)) {
r = -1;
errno = EINVAL;
}
if (r == -1) {
fatal("Invalid buffer size \"%s\": %s",
optarg + 7, strerror(errno));
}
sftp_copy_buflen = (size_t)llv;
} else if (strncmp(optarg, "nrequests=", 10) == 0) {
llv = strtonum(optarg + 10, 1, 256 * 1024,
&errstr);
if (errstr != NULL) {
fatal("Invalid number of requests "
"\"%s\": %s", optarg + 10, errstr);
}
sftp_nrequests = (size_t)llv;
} else {
fatal("Invalid -X option");
}
break;
/* Server options. */
case 'd':
targetshouldbedirectory = 1;
break;
case 'f': /* "from" */
iamremote = 1;
fflag = 1;
break;
case 't': /* "to" */
iamremote = 1;
tflag = 1;
#ifdef HAVE_CYGWIN
setmode(0, O_BINARY);
#endif
break;
case 'T':
Tflag = 1;
break;
default:
usage();
}
}
argc -= optind;
argv += optind;
log_init(argv0, log_level, SYSLOG_FACILITY_USER, 2);
/* Do this last because we want the user to be able to override it */
addargs(&args, "-oForwardAgent=no");
if (iamremote)
mode = MODE_SCP;
if ((pwd = getpwuid(userid = getuid())) == NULL)
fatal("unknown user %u", (u_int) userid);
if (!isatty(STDOUT_FILENO))
showprogress = 0;
if (pflag) {
/* Cannot pledge: -p allows setuid/setgid files... */
} else {
if (pledge("stdio rpath wpath cpath fattr tty proc exec",
NULL) == -1) {
perror("pledge");
exit(1);
}
}
remin = STDIN_FILENO;
remout = STDOUT_FILENO;
if (fflag) {
/* Follow "protocol", send data. */
(void) response();
source(argc, argv);
exit(errs != 0);
}
if (tflag) {
/* Receive data. */
sink(argc, argv, NULL);
exit(errs != 0);
}
if (argc < 2)
usage();
if (argc > 2)
targetshouldbedirectory = 1;
remin = remout = -1;
do_cmd_pid = -1;
/* Command to be executed on remote system using "ssh". */
(void) snprintf(cmd, sizeof cmd, "scp%s%s%s%s",
verbose_mode ? " -v" : "",
iamrecursive ? " -r" : "", pflag ? " -p" : "",
targetshouldbedirectory ? " -d" : "");
(void) ssh_signal(SIGPIPE, lostconn);
if (colon(argv[argc - 1])) /* Dest is remote host. */
toremote(argc, argv, mode, sftp_direct);
else {
if (targetshouldbedirectory)
verifydir(argv[argc - 1]);
tolocal(argc, argv, mode, sftp_direct); /* Dest is local host. */
}
/*
* Finally check the exit status of the ssh process, if one was forked
* and no error has occurred yet
*/
if (do_cmd_pid != -1 && (mode == MODE_SFTP || errs == 0)) {
if (remin != -1)
(void) close(remin);
if (remout != -1)
(void) close(remout);
if (waitpid(do_cmd_pid, &status, 0) == -1)
errs = 1;
else {
if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
errs = 1;
}
}
exit(errs != 0);
}
/* Callback from atomicio6 to update progress meter and limit bandwidth */
static int
scpio(void *_cnt, size_t s)
{
off_t *cnt = (off_t *)_cnt;
*cnt += s;
refresh_progress_meter(0);
if (limit_kbps > 0)
bandwidth_limit(&bwlimit, s);
return 0;
}
static int
do_times(int fd, int verb, const struct stat *sb)
{
/* strlen(2^64) == 20; strlen(10^6) == 7 */
char buf[(20 + 7 + 2) * 2 + 2];
(void)snprintf(buf, sizeof(buf), "T%llu 0 %llu 0\n",
(unsigned long long) (sb->st_mtime < 0 ? 0 : sb->st_mtime),
(unsigned long long) (sb->st_atime < 0 ? 0 : sb->st_atime));
if (verb) {
fprintf(stderr, "File mtime %lld atime %lld\n",
(long long)sb->st_mtime, (long long)sb->st_atime);
fprintf(stderr, "Sending file timestamps: %s", buf);
}
(void) atomicio(vwrite, fd, buf, strlen(buf));
return (response());
}
static int
parse_scp_uri(const char *uri, char **userp, char **hostp, int *portp,
char **pathp)
{
int r;
r = parse_uri("scp", uri, userp, hostp, portp, pathp);
if (r == 0 && *pathp == NULL)
*pathp = xstrdup(".");
return r;
}
/* Appends a string to an array; returns 0 on success, -1 on alloc failure */
static int
append(char *cp, char ***ap, size_t *np)
{
char **tmp;
if ((tmp = reallocarray(*ap, *np + 1, sizeof(*tmp))) == NULL)
return -1;
tmp[(*np)] = cp;
(*np)++;
*ap = tmp;
return 0;
}
/*
* Finds the start and end of the first brace pair in the pattern.
* returns 0 on success or -1 for invalid patterns.
*/
static int
find_brace(const char *pattern, int *startp, int *endp)
{
int i;
int in_bracket, brace_level;
*startp = *endp = -1;
in_bracket = brace_level = 0;
for (i = 0; i < INT_MAX && *endp < 0 && pattern[i] != '\0'; i++) {
switch (pattern[i]) {
case '\\':
/* skip next character */
if (pattern[i + 1] != '\0')
i++;
break;
case '[':
in_bracket = 1;
break;
case ']':
in_bracket = 0;
break;
case '{':
if (in_bracket)
break;
if (pattern[i + 1] == '}') {
/* Protect a single {}, for find(1), like csh */
i++; /* skip */
break;
}
if (*startp == -1)
*startp = i;
brace_level++;
break;
case '}':
if (in_bracket)
break;
if (*startp < 0) {
/* Unbalanced brace */
return -1;
}
if (--brace_level <= 0)
*endp = i;
break;
}
}
/* unbalanced brackets/braces */
if (*endp < 0 && (*startp >= 0 || in_bracket))
return -1;
return 0;
}
/*
* Assembles and records a successfully-expanded pattern, returns -1 on
* alloc failure.
*/
static int
emit_expansion(const char *pattern, int brace_start, int brace_end,
int sel_start, int sel_end, char ***patternsp, size_t *npatternsp)
{
char *cp;
size_t pattern_len;
int o = 0, tail_len;
if ((pattern_len = strlen(pattern)) == 0 || pattern_len >= INT_MAX)
return -1;
tail_len = strlen(pattern + brace_end + 1);
if ((cp = malloc(brace_start + (sel_end - sel_start) +
tail_len + 1)) == NULL)
return -1;
/* Pattern before initial brace */
if (brace_start > 0) {
memcpy(cp, pattern, brace_start);
o = brace_start;
}
/* Current braced selection */
if (sel_end - sel_start > 0) {
memcpy(cp + o, pattern + sel_start,
sel_end - sel_start);
o += sel_end - sel_start;
}
/* Remainder of pattern after closing brace */
if (tail_len > 0) {
memcpy(cp + o, pattern + brace_end + 1, tail_len);
o += tail_len;
}
cp[o] = '\0';
if (append(cp, patternsp, npatternsp) != 0) {
free(cp);
return -1;
}
return 0;
}
/*
* Expand the first encountered brace in pattern, appending the expanded
* patterns it yielded to the *patternsp array.
*
* Returns 0 on success or -1 on allocation failure.
*
* Signals whether expansion was performed via *expanded and whether
* pattern was invalid via *invalid.
*/
static int
brace_expand_one(const char *pattern, char ***patternsp, size_t *npatternsp,
int *expanded, int *invalid)
{
int i;
int in_bracket, brace_start, brace_end, brace_level;
int sel_start, sel_end;
*invalid = *expanded = 0;
if (find_brace(pattern, &brace_start, &brace_end) != 0) {
*invalid = 1;
return 0;
} else if (brace_start == -1)
return 0;
in_bracket = brace_level = 0;
for (i = sel_start = brace_start + 1; i < brace_end; i++) {
switch (pattern[i]) {
case '{':
if (in_bracket)
break;
brace_level++;
break;
case '}':
if (in_bracket)
break;
brace_level--;
break;
case '[':
in_bracket = 1;
break;
case ']':
in_bracket = 0;
break;
case '\\':
if (i < brace_end - 1)
i++; /* skip */
break;
}
if (pattern[i] == ',' || i == brace_end - 1) {
if (in_bracket || brace_level > 0)
continue;
/* End of a selection, emit an expanded pattern */
/* Adjust end index for last selection */
sel_end = (i == brace_end - 1) ? brace_end : i;
if (emit_expansion(pattern, brace_start, brace_end,
sel_start, sel_end, patternsp, npatternsp) != 0)
return -1;
/* move on to the next selection */
sel_start = i + 1;
continue;
}
}
if (in_bracket || brace_level > 0) {
*invalid = 1;
return 0;
}
/* success */
*expanded = 1;
return 0;
}
/* Expand braces from pattern. Returns 0 on success, -1 on failure */
static int
brace_expand(const char *pattern, char ***patternsp, size_t *npatternsp)
{
char *cp, *cp2, **active = NULL, **done = NULL;
size_t i, nactive = 0, ndone = 0;
int ret = -1, invalid = 0, expanded = 0;
*patternsp = NULL;
*npatternsp = 0;
/* Start the worklist with the original pattern */
if ((cp = strdup(pattern)) == NULL)
return -1;
if (append(cp, &active, &nactive) != 0) {
free(cp);
return -1;
}
while (nactive > 0) {
cp = active[nactive - 1];
nactive--;
if (brace_expand_one(cp, &active, &nactive,
&expanded, &invalid) == -1) {
free(cp);
goto fail;
}
if (invalid)
fatal_f("invalid brace pattern \"%s\"", cp);
if (expanded) {
/*
* Current entry expanded to new entries on the
* active list; discard the progenitor pattern.
*/
free(cp);
continue;
}
/*
* Pattern did not expand; append the finename component to
* the completed list
*/
if ((cp2 = strrchr(cp, '/')) != NULL)
*cp2++ = '\0';
else
cp2 = cp;
if (append(xstrdup(cp2), &done, &ndone) != 0) {
free(cp);
goto fail;
}
free(cp);
}