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NetBSD/bin/rcp/rcp.c

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/* $NetBSD: rcp.c,v 1.50 2020/05/06 18:15:40 aymeric Exp $ */
/*
* Copyright (c) 1983, 1990, 1992, 1993
* 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 <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1983, 1990, 1992, 1993\
The Regents of the University of California. All rights reserved.");
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)rcp.c 8.2 (Berkeley) 4/2/94";
#else
__RCSID("$NetBSD: rcp.c,v 1.50 2020/05/06 18:15:40 aymeric Exp $");
#endif
#endif /* not lint */
#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 <locale.h>
#include <netdb.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "pathnames.h"
#include "extern.h"
#define OPTIONS "46dfprt"
struct passwd *pwd;
char *pwname;
u_short port;
uid_t userid;
int errs, rem;
int pflag, iamremote, iamrecursive, targetshouldbedirectory;
int family = AF_UNSPEC;
static char dot[] = ".";
#define CMDNEEDS 64
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, tflag;
char *targ;
const char *shell;
setprogname(argv[0]);
(void)setlocale(LC_ALL, "");
fflag = tflag = 0;
while ((ch = getopt(argc, argv, OPTIONS)) != -1)
switch(ch) { /* User-visible flags. */
case '4':
family = AF_INET;
break;
case '6':
family = AF_INET6;
break;
case 'K':
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 = "shell", "tcp");
if (sp == NULL)
errx(1, "%s/tcp: unknown service", shell);
port = sp->s_port;
if ((pwd = getpwuid(userid = getuid())) == NULL)
errx(1, "unknown user %d", (int)userid);
if ((pwname = strdup(pwd->pw_name)) == NULL)
err(1, NULL);
rem = STDIN_FILENO; /* XXX */
if (fflag) { /* Follow "protocol", send data. */
(void)response();
source(argc, argv);
exit(errs);
}
if (tflag) { /* Receive data. */
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])) != NULL)/* Dest is remote host. */
toremote(targ, argc, argv);
else {
tolocal(argc, argv); /* Dest is local host. */
if (targetshouldbedirectory)
verifydir(argv[argc - 1]);
}
exit(errs);
/* NOTREACHED */
}
void
toremote(char *targ, int argc, char *argv[])
{
int i;
size_t len;
char *bp, *host, *src, *suser, *thost, *tuser;
*targ++ = 0;
if (*targ == 0)
targ = dot;
if ((thost = strchr(argv[argc - 1], '@')) != NULL) {
/* 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;
}
thost = unbracket(thost);
for (i = 0; i < argc - 1; i++) {
src = colon(argv[i]);
if (src) { /* remote to remote */
*src++ = 0;
if (*src == 0)
src = dot;
host = strchr(argv[i], '@');
len = strlen(_PATH_RSH) + strlen(argv[i]) +
strlen(src) + (tuser ? strlen(tuser) : 0) +
strlen(thost) + strlen(targ) + CMDNEEDS + 20;
if (!(bp = malloc(len)))
err(1, NULL);
if (host) {
*host++ = 0;
host = unbracket(host);
suser = argv[i];
if (*suser == '\0')
suser = pwname;
else if (!okname(suser)) {
(void)free(bp);
continue;
}
(void)snprintf(bp, len,
"%s %s -l %s -n %s %s '%s%s%s:%s'",
_PATH_RSH, host, suser, cmd, src,
tuser ? tuser : "", tuser ? "@" : "",
thost, targ);
} else {
host = unbracket(argv[i]);
(void)snprintf(bp, len,
"exec %s %s -n %s %s '%s%s%s:%s'",
_PATH_RSH, argv[i], cmd, src,
tuser ? tuser : "", tuser ? "@" : "",
thost, targ);
}
(void)susystem(bp);
(void)free(bp);
} else { /* local to remote */
if (rem == -1) {
len = strlen(targ) + CMDNEEDS + 20;
if (!(bp = malloc(len)))
err(1, NULL);
(void)snprintf(bp, len, "%s -t %s", cmd, targ);
host = thost;
rem = rcmd_af(&host, port, pwname,
tuser ? tuser : pwname,
bp, NULL, family);
if (rem < 0)
exit(1);
if (response() < 0)
exit(1);
(void)free(bp);
}
source(1, argv+i);
}
}
}
void
tolocal(int argc, char *argv[])
{
int i;
size_t len;
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, NULL);
(void)snprintf(bp, len, "exec %s%s%s %s %s", _PATH_CP,
iamrecursive ? " -r" : "", pflag ? " -p" : "",
argv[i], argv[argc - 1]);
if (susystem(bp))
++errs;
(void)free(bp);
continue;
}
*src++ = 0;
if (*src == 0)
src = dot;
if ((host = strchr(argv[i], '@')) == NULL) {
host = argv[i];
suser = pwname;
} else {
*host++ = 0;
suser = argv[i];
if (*suser == '\0')
suser = pwname;
else if (!okname(suser))
continue;
}
host = unbracket(host);
len = strlen(src) + CMDNEEDS + 20;
if ((bp = malloc(len)) == NULL)
err(1, NULL);
(void)snprintf(bp, len, "%s -f %s", cmd, src);
rem =
rcmd_af(&host, port, pwname, suser, bp, NULL, family);
(void)free(bp);
if (rem < 0) {
++errs;
continue;
}
sink(1, argv + argc - 1);
(void)close(rem);
rem = -1;
}
}
void
source(int argc, char *argv[])
{
struct stat stb;
static BUF buffer;
BUF *bp;
off_t i;
off_t amt;
int 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%lld %ld %lld %ld\n",
(long long)stb.st_mtimespec.tv_sec,
(long)stb.st_mtimespec.tv_nsec / 1000,
(long long)stb.st_atimespec.tv_sec,
(long)stb.st_atimespec.tv_nsec / 1000);
(void)write(rem, buf, strlen(buf));
if (response() < 0)
goto next;
}
#define RCPMODEMASK (S_ISUID|S_ISGID|S_ISTXT|S_IRWXU|S_IRWXG|S_IRWXO)
(void)snprintf(buf, sizeof(buf), "C%04o %lld %s\n",
stb.st_mode & RCPMODEMASK, (long long)stb.st_size, last);
(void)write(rem, buf, strlen(buf));
if (response() < 0)
goto next;
if ((bp = allocbuf(&buffer, fd, BUFSIZ)) == NULL) {
next: (void)close(fd);
continue;
}
/* Keep writing after an error so that we stay sync'd up. */
haderr = 0;
for (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, (size_t)amt);
if (result != amt)
haderr = result >= 0 ? EIO : errno;
}
if (haderr)
(void)write(rem, bp->buf, (size_t)amt);
else {
result = write(rem, bp->buf, (size_t)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[MAXPATHLEN];
if (!(dirp = opendir(name))) {
run_err("%s: %s", name, strerror(errno));
return;
}
last = strrchr(name, '/');
if (last == 0)
last = name;
else
last++;
if (pflag) {
(void)snprintf(path, sizeof(path), "T%lld %ld %lld %ld\n",
(long long)statp->st_mtimespec.tv_sec,
(long)statp->st_mtimespec.tv_nsec / 1000,
(long long)statp->st_atimespec.tv_sec,
(long)statp->st_atimespec.tv_nsec / 1000);
(void)write(rem, path, strlen(path));
if (response() < 0) {
(void)closedir(dirp);
return;
}
}
(void)snprintf(path, sizeof(path),
"D%04o %d %s\n", statp->st_mode & RCPMODEMASK, 0, last);
(void)write(rem, path, strlen(path));
if (response() < 0) {
(void)closedir(dirp);
return;
}
while ((dp = readdir(dirp)) != NULL) {
if (dp->d_ino == 0)
continue;
if (!strcmp(dp->d_name, dot) || !strcmp(dp->d_name, ".."))
continue;
if (strlen(name) + 1 + strlen(dp->d_name) >= MAXPATHLEN - 1) {
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];
BUF *bp;
ssize_t j;
off_t i;
off_t amt;
off_t count;
int exists, first, ofd;
mode_t mask;
mode_t mode;
mode_t omode;
int setimes, targisdir, wrerr;
int wrerrno = 0; /* pacify gcc */
const char *wrcontext = NULL;
char ch, *cp, *np, *targ, *vect[1], buf[BUFSIZ];
const char *why;
off_t size;
char *namebuf = NULL;
size_t cursize = 0;
#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)
goto out;
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);
goto out;
}
if (ch == '\n')
*--cp = 0;
#define getnum(t) (t) = 0; while (isdigit((unsigned char)*cp)) (t) = (t) * 10 + (*cp++ - '0');
cp = buf;
if (*cp == 'T') {
setimes++;
cp++;
getnum(mtime.tv_sec);
if (*cp++ != ' ')
SCREWUP("mtime.sec not delimited");
getnum(mtime.tv_usec);
if (*cp++ != ' ')
SCREWUP("mtime.usec not delimited");
getnum(atime.tv_sec);
if (*cp++ != ' ')
SCREWUP("atime.sec not delimited");
getnum(atime.tv_usec);
if (*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((unsigned char)*cp);)
size = size * 10 + (*cp++ - '0');
if (*cp++ != ' ')
SCREWUP("size not delimited");
if (targisdir) {
char *newnamebuf;
size_t need;
need = strlen(targ) + strlen(cp) + 2;
if (need > cursize) {
need += 256;
newnamebuf = realloc(namebuf, need);
if (newnamebuf != NULL) {
namebuf = newnamebuf;
cursize = need;
} else {
run_err("%s", strerror(errno));
exit(1);
}
}
(void)snprintf(namebuf, cursize, "%s%s%s", targ,
*targ ? "/" : "", cp);
np = namebuf;
} 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;
(void) utimes(np, tv);
}
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 = 0;
/*
* Like run_err(), but don't send any message to the remote end.
* Instead, record the first error and send that in the end.
*/
#define RUN_ERR(w_context) do { \
if (!wrerr) { \
wrerrno = errno; \
wrcontext = w_context; \
wrerr = 1; \
} \
} while(0)
count = 0;
for (i = 0; i < size; i += BUFSIZ) {
amt = BUFSIZ;
if (i + amt > size)
amt = size - i;
count += amt;
do {
j = read(rem, cp, (size_t)amt);
if (j == -1) {
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) {
j = write(ofd, bp->buf, (size_t)count);
if (j != count) {
if (j >= 0)
errno = EIO;
RUN_ERR("write");
}
}
count = 0;
cp = bp->buf;
}
}
if (count != 0 && !wrerr &&
(j = write(ofd, bp->buf, (size_t)count)) != count) {
if (j >= 0)
errno = EIO;
RUN_ERR("write");
}
if (ftruncate(ofd, size))
RUN_ERR("truncate");
if (pflag) {
if (exists || omode != mode)
if (fchmod(ofd, omode))
RUN_ERR("set mode");
} else {
if (!exists && omode != mode)
if (fchmod(ofd, omode & ~mask))
RUN_ERR("set mode");
}
#ifndef __SVR4
if (setimes && !wrerr) {
setimes = 0;
if (futimes(ofd, tv) < 0)
RUN_ERR("set times");
}
#endif
(void)close(ofd);
#ifdef __SVR4
if (setimes && !wrerr) {
setimes = 0;
if (utimes(np, tv) < 0)
RUN_ERR("set times");
}
#endif
(void)response();
if (wrerr)
run_err("%s: %s: %s", np, wrcontext, strerror(wrerrno));
else
(void)write(rem, "", 1);
}
out:
if (namebuf) {
free(namebuf);
}
return;
screwup:
run_err("protocol error: %s", why);
exit(1);
/* NOTREACHED */
}
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, (size_t)(cp - rbuf));
++errs;
if (resp == 1)
return (-1);
exit(1);
}
/* NOTREACHED */
}
void
usage(void)
{
(void)fprintf(stderr,
"usage: rcp [-46p] f1 f2; or: rcp [-46pr] f1 ... fn directory\n");
exit(1);
/* NOTREACHED */
}
#include <stdarg.h>
void
run_err(const char *fmt, ...)
{
static FILE *fp;
va_list ap;
++errs;
if (fp == NULL && !(fp = fdopen(rem, "w")))
return;
va_start(ap, fmt);
(void)fprintf(fp, "%c", 0x01);
(void)fprintf(fp, "rcp: ");
(void)vfprintf(fp, fmt, ap);
(void)fprintf(fp, "\n");
(void)fflush(fp);
va_end(ap);
if (!iamremote) {
va_start(ap, fmt);
vwarnx(fmt, ap);
va_end(ap);
}
}
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