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HardenedBSD/bin/rcp/rcp.c
Pedro F. Giffuni 3b7175bdc7 rcp(1): replace 0 with NULL for pointers. 
Found with devel/coccinelle.
2016-04-11 17:24:26 +00:00

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/*-
* Copyright (c) 1983, 1990, 1992, 1993
* The Regents of the University of California. All rights reserved.
* Copyright (c) 2002 Networks Associates Technology, Inc.
* All rights reserved.
*
* Portions of this software were developed for the FreeBSD Project by
* ThinkSec AS and NAI Labs, the Security Research Division of Network
* Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
* ("CBOSS"), as part of the DARPA CHATS research program.
*
* 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.
* 4. 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.
*/
#if 0
#ifndef lint
static char const copyright[] =
"@(#) Copyright (c) 1983, 1990, 1992, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
static char sccsid[] = "@(#)rcp.c 8.2 (Berkeley) 4/2/94";
#endif /* not lint */
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <ctype.h>
#include <dirent.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <netdb.h>
#include <paths.h>
#include <pwd.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "extern.h"
#define OPTIONS "46dfprt"
static struct passwd *pwd;
static u_short port;
static uid_t userid;
static int errs, rem;
int iamremote;
static int pflag, iamrecursive, targetshouldbedirectory;
static int family = PF_UNSPEC;
static int argc_copy;
static const char **argv_copy;
static char period[] = ".";
#define CMDNEEDS 64
static char cmd[CMDNEEDS]; /* must hold "rcp -r -p -d\0" */
int response(void);
void rsource(char *, struct stat *);
void sink(int, char *[]);
void source(int, char *[]);
void tolocal(int, char *[]);
void toremote(char *, int, char *[]);
void usage(void);
int
main(int argc, char *argv[])
{
struct servent *sp;
int ch, fflag, i, tflag;
char *targ;
/*
* Prepare for execing ourselves.
*/
argc_copy = argc + 1;
argv_copy = malloc((argc_copy + 1) * sizeof(*argv_copy));
if (argv_copy == NULL)
err(1, "malloc");
argv_copy[0] = argv[0];
argv_copy[1] = "-K";
for (i = 1; i < argc; ++i) {
argv_copy[i + 1] = strdup(argv[i]);
if (argv_copy[i + 1] == NULL)
errx(1, "strdup: out of memory");
}
argv_copy[argc + 1] = NULL;
fflag = tflag = 0;
while ((ch = getopt(argc, argv, OPTIONS)) != -1)
switch(ch) { /* User-visible flags. */
case '4':
family = PF_INET;
break;
case '6':
family = PF_INET6;
break;
case 'p':
pflag = 1;
break;
case 'r':
iamrecursive = 1;
break;
/* Server options. */
case 'd':
targetshouldbedirectory = 1;
break;
case 'f': /* "from" */
iamremote = 1;
fflag = 1;
break;
case 't': /* "to" */
iamremote = 1;
tflag = 1;
break;
case '?':
default:
usage();
}
argc -= optind;
argv += optind;
sp = getservbyname("shell", "tcp");
if (sp == NULL)
errx(1, "shell/tcp: unknown service");
port = sp->s_port;
if ((pwd = getpwuid(userid = getuid())) == NULL)
errx(1, "unknown user %d", (int)userid);
rem = STDIN_FILENO; /* XXX */
if (fflag) { /* Follow "protocol", send data. */
(void)response();
(void)setuid(userid);
source(argc, argv);
exit(errs);
}
if (tflag) { /* Receive data. */
(void)setuid(userid);
sink(argc, argv);
exit(errs);
}
if (argc < 2)
usage();
if (argc > 2)
targetshouldbedirectory = 1;
rem = -1;
/* Command to be executed on remote system using "rsh". */
(void)snprintf(cmd, sizeof(cmd), "rcp%s%s%s",
iamrecursive ? " -r" : "", pflag ? " -p" : "",
targetshouldbedirectory ? " -d" : "");
(void)signal(SIGPIPE, lostconn);
if ((targ = colon(argv[argc - 1]))) /* Dest is remote host. */
toremote(targ, argc, argv);
else {
tolocal(argc, argv); /* Dest is local host. */
if (targetshouldbedirectory)
verifydir(argv[argc - 1]);
}
exit(errs);
}
void
toremote(char *targ, int argc, char *argv[])
{
int i, tos;
char *bp, *host, *src, *suser, *thost, *tuser;
*targ++ = 0;
if (*targ == 0)
targ = period;
if ((thost = strchr(argv[argc - 1], '@'))) {
/* user@host */
*thost++ = 0;
tuser = argv[argc - 1];
if (*tuser == '\0')
tuser = NULL;
else if (!okname(tuser))
exit(1);
} else {
thost = argv[argc - 1];
tuser = NULL;
}
for (i = 0; i < argc - 1; i++) {
src = colon(argv[i]);
if (src) { /* remote to remote */
*src++ = 0;
if (*src == 0)
src = period;
host = strchr(argv[i], '@');
if (host) {
*host++ = 0;
suser = argv[i];
if (*suser == '\0')
suser = pwd->pw_name;
else if (!okname(suser)) {
++errs;
continue;
}
if (asprintf(&bp,
"%s %s -l %s -n %s %s '%s%s%s:%s'",
_PATH_RSH, host, suser, cmd, src,
tuser ? tuser : "", tuser ? "@" : "",
thost, targ) == -1)
err(1, "asprintf");
} else
if (asprintf(&bp,
"exec %s %s -n %s %s '%s%s%s:%s'",
_PATH_RSH, argv[i], cmd, src,
tuser ? tuser : "", tuser ? "@" : "",
thost, targ) == -1)
err(1, "asprintf");
(void)susystem(bp, userid);
(void)free(bp);
} else { /* local to remote */
if (rem == -1) {
if (asprintf(&bp, "%s -t %s", cmd, targ)
== -1)
err(1, "asprintf");
host = thost;
rem = rcmd_af(&host, port,
pwd->pw_name,
tuser ? tuser : pwd->pw_name,
bp, 0, family);
if (rem < 0)
exit(1);
if (family == PF_INET) {
tos = IPTOS_THROUGHPUT;
if (setsockopt(rem, IPPROTO_IP, IP_TOS,
&tos, sizeof(int)) < 0)
warn("TOS (ignored)");
}
if (response() < 0)
exit(1);
(void)free(bp);
(void)setuid(userid);
}
source(1, argv+i);
}
}
}
void
tolocal(int argc, char *argv[])
{
int i, len, tos;
char *bp, *host, *src, *suser;
for (i = 0; i < argc - 1; i++) {
if (!(src = colon(argv[i]))) { /* Local to local. */
len = strlen(_PATH_CP) + strlen(argv[i]) +
strlen(argv[argc - 1]) + 20;
if (!(bp = malloc(len)))
err(1, "malloc");
(void)snprintf(bp, len, "exec %s%s%s %s %s", _PATH_CP,
iamrecursive ? " -PR" : "", pflag ? " -p" : "",
argv[i], argv[argc - 1]);
if (susystem(bp, userid))
++errs;
(void)free(bp);
continue;
}
*src++ = 0;
if (*src == 0)
src = period;
if ((host = strchr(argv[i], '@')) == NULL) {
host = argv[i];
suser = pwd->pw_name;
} else {
*host++ = 0;
suser = argv[i];
if (*suser == '\0')
suser = pwd->pw_name;
else if (!okname(suser)) {
++errs;
continue;
}
}
len = strlen(src) + CMDNEEDS + 20;
if ((bp = malloc(len)) == NULL)
err(1, "malloc");
(void)snprintf(bp, len, "%s -f %s", cmd, src);
rem = rcmd_af(&host, port, pwd->pw_name, suser, bp, 0,
family);
(void)free(bp);
if (rem < 0) {
++errs;
continue;
}
(void)seteuid(userid);
if (family == PF_INET) {
tos = IPTOS_THROUGHPUT;
if (setsockopt(rem, IPPROTO_IP, IP_TOS, &tos,
sizeof(int)) < 0)
warn("TOS (ignored)");
}
sink(1, argv + argc - 1);
(void)seteuid(0);
(void)close(rem);
rem = -1;
}
}
void
source(int argc, char *argv[])
{
struct stat stb;
static BUF buffer;
BUF *bp;
off_t i;
int amt, fd, haderr, indx, result;
char *last, *name, buf[BUFSIZ];
for (indx = 0; indx < argc; ++indx) {
name = argv[indx];
if ((fd = open(name, O_RDONLY, 0)) < 0)
goto syserr;
if (fstat(fd, &stb)) {
syserr: run_err("%s: %s", name, strerror(errno));
goto next;
}
switch (stb.st_mode & S_IFMT) {
case S_IFREG:
break;
case S_IFDIR:
if (iamrecursive) {
rsource(name, &stb);
goto next;
}
/* FALLTHROUGH */
default:
run_err("%s: not a regular file", name);
goto next;
}
if ((last = strrchr(name, '/')) == NULL)
last = name;
else
++last;
if (pflag) {
/*
* Make it compatible with possible future
* versions expecting microseconds.
*/
(void)snprintf(buf, sizeof(buf), "T%ld 0 %ld 0\n",
(long)stb.st_mtim.tv_sec,
(long)stb.st_atim.tv_sec);
(void)write(rem, buf, strlen(buf));
if (response() < 0)
goto next;
}
#define MODEMASK (S_ISUID|S_ISGID|S_ISTXT|S_IRWXU|S_IRWXG|S_IRWXO)
(void)snprintf(buf, sizeof(buf), "C%04o %jd %s\n",
stb.st_mode & MODEMASK, (intmax_t)stb.st_size, last);
(void)write(rem, buf, strlen(buf));
if (response() < 0)
goto next;
if ((bp = allocbuf(&buffer, fd, BUFSIZ)) == NULL) {
next: if (fd >= 0)
(void)close(fd);
continue;
}
/* Keep writing after an error so that we stay sync'd up. */
for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
amt = bp->cnt;
if (i + amt > stb.st_size)
amt = stb.st_size - i;
if (!haderr) {
result = read(fd, bp->buf, amt);
if (result != amt)
haderr = result >= 0 ? EIO : errno;
}
if (haderr)
(void)write(rem, bp->buf, amt);
else {
result = write(rem, bp->buf, amt);
if (result != amt)
haderr = result >= 0 ? EIO : errno;
}
}
if (close(fd) && !haderr)
haderr = errno;
if (!haderr)
(void)write(rem, "", 1);
else
run_err("%s: %s", name, strerror(haderr));
(void)response();
}
}
void
rsource(char *name, struct stat *statp)
{
DIR *dirp;
struct dirent *dp;
char *last, *vect[1], path[PATH_MAX];
if (!(dirp = opendir(name))) {
run_err("%s: %s", name, strerror(errno));
return;
}
last = strrchr(name, '/');
if (last == NULL)
last = name;
else
last++;
if (pflag) {
(void)snprintf(path, sizeof(path), "T%ld 0 %ld 0\n",
(long)statp->st_mtim.tv_sec,
(long)statp->st_atim.tv_sec);
(void)write(rem, path, strlen(path));
if (response() < 0) {
closedir(dirp);
return;
}
}
(void)snprintf(path, sizeof(path),
"D%04o %d %s\n", statp->st_mode & MODEMASK, 0, last);
(void)write(rem, path, strlen(path));
if (response() < 0) {
closedir(dirp);
return;
}
while ((dp = readdir(dirp))) {
if (dp->d_ino == 0)
continue;
if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
continue;
if (strlen(name) + 1 + strlen(dp->d_name) >= sizeof(path)) {
run_err("%s/%s: name too long", name, dp->d_name);
continue;
}
(void)snprintf(path, sizeof(path), "%s/%s", name, dp->d_name);
vect[0] = path;
source(1, vect);
}
(void)closedir(dirp);
(void)write(rem, "E\n", 2);
(void)response();
}
void
sink(int argc, char *argv[])
{
static BUF buffer;
struct stat stb;
struct timeval tv[2];
enum { YES, NO, DISPLAYED } wrerr;
BUF *bp;
off_t i, j, size;
int amt, exists, first, mask, mode, ofd, omode;
size_t count;
int setimes, targisdir, wrerrno = 0;
char ch, *cp, *np, *targ, *vect[1], buf[BUFSIZ], path[PATH_MAX];
const char *why;
#define atime tv[0]
#define mtime tv[1]
#define SCREWUP(str) { why = str; goto screwup; }
setimes = targisdir = 0;
mask = umask(0);
if (!pflag)
(void)umask(mask);
if (argc != 1) {
run_err("ambiguous target");
exit(1);
}
targ = *argv;
if (targetshouldbedirectory)
verifydir(targ);
(void)write(rem, "", 1);
if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
targisdir = 1;
for (first = 1;; first = 0) {
cp = buf;
if (read(rem, cp, 1) <= 0)
return;
if (*cp++ == '\n')
SCREWUP("unexpected <newline>");
do {
if (read(rem, &ch, sizeof(ch)) != sizeof(ch))
SCREWUP("lost connection");
*cp++ = ch;
} while (cp < &buf[BUFSIZ - 1] && ch != '\n');
*cp = 0;
if (buf[0] == '\01' || buf[0] == '\02') {
if (iamremote == 0)
(void)write(STDERR_FILENO,
buf + 1, strlen(buf + 1));
if (buf[0] == '\02')
exit(1);
++errs;
continue;
}
if (buf[0] == 'E') {
(void)write(rem, "", 1);
return;
}
if (ch == '\n')
*--cp = 0;
cp = buf;
if (*cp == 'T') {
setimes++;
cp++;
mtime.tv_sec = strtol(cp, &cp, 10);
if (!cp || *cp++ != ' ')
SCREWUP("mtime.sec not delimited");
mtime.tv_usec = strtol(cp, &cp, 10);
if (!cp || *cp++ != ' ')
SCREWUP("mtime.usec not delimited");
atime.tv_sec = strtol(cp, &cp, 10);
if (!cp || *cp++ != ' ')
SCREWUP("atime.sec not delimited");
atime.tv_usec = strtol(cp, &cp, 10);
if (!cp || *cp++ != '\0')
SCREWUP("atime.usec not delimited");
(void)write(rem, "", 1);
continue;
}
if (*cp != 'C' && *cp != 'D') {
/*
* Check for the case "rcp remote:foo\* local:bar".
* In this case, the line "No match." can be returned
* by the shell before the rcp command on the remote is
* executed so the ^Aerror_message convention isn't
* followed.
*/
if (first) {
run_err("%s", cp);
exit(1);
}
SCREWUP("expected control record");
}
mode = 0;
for (++cp; cp < buf + 5; cp++) {
if (*cp < '0' || *cp > '7')
SCREWUP("bad mode");
mode = (mode << 3) | (*cp - '0');
}
if (*cp++ != ' ')
SCREWUP("mode not delimited");
for (size = 0; isdigit(*cp);)
size = size * 10 + (*cp++ - '0');
if (*cp++ != ' ')
SCREWUP("size not delimited");
if (targisdir) {
if (strlen(targ) + (*targ ? 1 : 0) + strlen(cp)
>= sizeof(path)) {
run_err("%s%s%s: name too long", targ,
*targ ? "/" : "", cp);
exit(1);
}
(void)snprintf(path, sizeof(path), "%s%s%s", targ,
*targ ? "/" : "", cp);
np = path;
} else
np = targ;
exists = stat(np, &stb) == 0;
if (buf[0] == 'D') {
int mod_flag = pflag;
if (exists) {
if (!S_ISDIR(stb.st_mode)) {
errno = ENOTDIR;
goto bad;
}
if (pflag)
(void)chmod(np, mode);
} else {
/* Handle copying from a read-only directory */
mod_flag = 1;
if (mkdir(np, mode | S_IRWXU) < 0)
goto bad;
}
vect[0] = np;
sink(1, vect);
if (setimes) {
setimes = 0;
if (utimes(np, tv) < 0)
run_err("%s: set times: %s",
np, strerror(errno));
}
if (mod_flag)
(void)chmod(np, mode);
continue;
}
omode = mode;
mode |= S_IWRITE;
if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
bad: run_err("%s: %s", np, strerror(errno));
continue;
}
(void)write(rem, "", 1);
if ((bp = allocbuf(&buffer, ofd, BUFSIZ)) == NULL) {
(void)close(ofd);
continue;
}
cp = bp->buf;
wrerr = NO;
for (count = i = 0; i < size; i += BUFSIZ) {
amt = BUFSIZ;
if (i + amt > size)
amt = size - i;
count += amt;
do {
j = read(rem, cp, amt);
if (j <= 0) {
run_err("%s", j ? strerror(errno) :
"dropped connection");
exit(1);
}
amt -= j;
cp += j;
} while (amt > 0);
if (count == bp->cnt) {
/* Keep reading so we stay sync'd up. */
if (wrerr == NO) {
j = write(ofd, bp->buf, count);
if (j != (off_t)count) {
wrerr = YES;
wrerrno = j >= 0 ? EIO : errno;
}
}
count = 0;
cp = bp->buf;
}
}
if (count != 0 && wrerr == NO &&
(j = write(ofd, bp->buf, count)) != (off_t)count) {
wrerr = YES;
wrerrno = j >= 0 ? EIO : errno;
}
if (ftruncate(ofd, size)) {
run_err("%s: truncate: %s", np, strerror(errno));
wrerr = DISPLAYED;
}
if (pflag) {
if (exists || omode != mode)
if (fchmod(ofd, omode))
run_err("%s: set mode: %s",
np, strerror(errno));
} else {
if (!exists && omode != mode)
if (fchmod(ofd, omode & ~mask))
run_err("%s: set mode: %s",
np, strerror(errno));
}
(void)close(ofd);
(void)response();
if (setimes && wrerr == NO) {
setimes = 0;
if (utimes(np, tv) < 0) {
run_err("%s: set times: %s",
np, strerror(errno));
wrerr = DISPLAYED;
}
}
switch(wrerr) {
case YES:
run_err("%s: %s", np, strerror(wrerrno));
break;
case NO:
(void)write(rem, "", 1);
break;
case DISPLAYED:
break;
}
}
screwup:
run_err("protocol error: %s", why);
exit(1);
}
int
response(void)
{
char ch, *cp, resp, rbuf[BUFSIZ];
if (read(rem, &resp, sizeof(resp)) != sizeof(resp))
lostconn(0);
cp = rbuf;
switch(resp) {
case 0: /* ok */
return (0);
default:
*cp++ = resp;
/* FALLTHROUGH */
case 1: /* error, followed by error msg */
case 2: /* fatal error, "" */
do {
if (read(rem, &ch, sizeof(ch)) != sizeof(ch))
lostconn(0);
*cp++ = ch;
} while (cp < &rbuf[BUFSIZ] && ch != '\n');
if (!iamremote)
(void)write(STDERR_FILENO, rbuf, cp - rbuf);
++errs;
if (resp == 1)
return (-1);
exit(1);
}
/* NOTREACHED */
}
void
usage(void)
{
(void)fprintf(stderr, "%s\n%s\n",
"usage: rcp [-46p] file1 file2",
" rcp [-46pr] file ... directory");
exit(1);
}
#include <stdarg.h>
void
run_err(const char *fmt, ...)
{
static FILE *fp;
va_list ap;
++errs;
if (fp == NULL && !(fp = fdopen(rem, "w")))
return;
(void)fprintf(fp, "%c", 0x01);
(void)fprintf(fp, "rcp: ");
va_start(ap, fmt);
(void)vfprintf(fp, fmt, ap);
va_end(ap);
(void)fprintf(fp, "\n");
(void)fflush(fp);
if (!iamremote) {
va_start(ap, fmt);
vwarnx(fmt, ap);
va_end(ap);
}
}
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