newlib/winsup/cygwin/libc/rexec.cc

414 lines
10 KiB
C++

/*
* Copyright (c) 1980, 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.
* 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.
*
* $FreeBSD$
*/
/* CV 2006-07-04: Tweaked for inclusion into Cygwin. */
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)rexec.c 8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */
#ifdef __CYGWIN__
#include "winsup.h"
#include "sigproc.h"
#include "cygtls.h"
#include <wininet.h>
#endif
#include <sys/types.h>
#include <sys/uio.h>
#include <sys/socket.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <netinet/in.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <netdb.h>
#include <errno.h>
#include <ctype.h>
#include <err.h>
#include <stdlib.h>
#include <unistd.h>
extern "C" {
int cygwin_accept (int, struct sockaddr *, socklen_t *);
int cygwin_connect (int, const struct sockaddr *, socklen_t);
int cygwin_gethostname (char *__name, size_t __len);
int cygwin_getsockname (int, struct sockaddr *, socklen_t *);
void cygwin_herror (const char *);
int cygwin_listen (int, int);
int cygwin_socket (int, int, int);
}
/*
* Options and other state info.
*/
struct macel {
char mac_name[9]; /* macro name */
char *mac_start; /* start of macro in macbuf */
char *mac_end; /* end of macro in macbuf */
};
int macnum; /* number of defined macros */
struct macel macros[16];
char macbuf[4096];
static FILE *cfile;
#define DEFAULT 1
#define LOGIN 2
#define PASSWD 3
#define ACCOUNT 4
#define MACDEF 5
#define ID 10
#define MACH 11
static char tokval[100];
static struct toktab {
const char *tokstr;
int tval;
} toktab[]= {
{ "default", DEFAULT },
{ "login", LOGIN },
{ "password", PASSWD },
{ "passwd", PASSWD },
{ "account", ACCOUNT },
{ "machine", MACH },
{ "macdef", MACDEF },
{ NULL, 0 }
};
static int
token()
{
char *cp;
int c;
struct toktab *t;
if (feof(cfile) || ferror(cfile))
return (0);
while ((c = getc(cfile)) != EOF &&
(c == '\n' || c == '\t' || c == ' ' || c == ','))
continue;
if (c == EOF)
return (0);
cp = tokval;
if (c == '"') {
while ((c = getc(cfile)) != EOF && c != '"') {
if (c == '\\')
c = getc(cfile);
*cp++ = c;
}
} else {
*cp++ = c;
while ((c = getc(cfile)) != EOF
&& c != '\n' && c != '\t' && c != ' ' && c != ',') {
if (c == '\\')
c = getc(cfile);
*cp++ = c;
}
}
*cp = 0;
if (tokval[0] == 0)
return (0);
for (t = toktab; t->tokstr; t++)
if (!strcmp(t->tokstr, tokval))
return (t->tval);
return (ID);
}
static int
ruserpass(const char *host, char **aname, char **apass, char **aacct)
{
const char *hdir;
char buf[BUFSIZ], *tmp;
char myname[INTERNET_MAX_HOST_NAME_LENGTH + 1];
const char *mydomain;
int t, i, c, usedefault = 0;
struct stat stb;
hdir = getenv("HOME");
if (hdir == NULL)
hdir = ".";
if (strlen(hdir) + 8 > sizeof(buf))
return (0);
(void) sprintf(buf, "%s/.netrc", hdir);
cfile = fopen(buf, "r");
if (cfile == NULL) {
if (errno != ENOENT)
warn("%s", buf);
return (0);
}
if (cygwin_gethostname(myname, sizeof(myname)) < 0)
myname[0] = '\0';
if ((mydomain = strchr(myname, '.')) == NULL)
mydomain = "";
next:
while ((t = token())) switch(t) {
case DEFAULT:
usedefault = 1;
fallthrough;
case MACH:
if (!usedefault) {
if (token() != ID)
continue;
/*
* Allow match either for user's input host name
* or official hostname. Also allow match of
* incompletely-specified host in local domain.
*/
if (strcasecmp(host, tokval) == 0)
goto match;
if ((tmp = strchr(host, '.')) != NULL &&
strcasecmp(tmp, mydomain) == 0 &&
strncasecmp(host, tokval, tmp - host) == 0 &&
tokval[tmp - host] == '\0')
goto match;
continue;
}
match:
while ((t = token()) && t != MACH && t != DEFAULT) switch(t) {
case LOGIN:
if (token()) {
if (*aname == 0) {
*aname = (char *) malloc((unsigned) strlen(tokval) + 1);
(void) strcpy(*aname, tokval);
} else {
if (strcmp(*aname, tokval))
goto next;
}
}
break;
case PASSWD:
if ((*aname == 0 || strcmp(*aname, "anonymous")) &&
fstat64(fileno(cfile), &stb) >= 0 &&
(stb.st_mode & 077) != 0) {
warnx("Error: .netrc file is readable by others.");
warnx("Remove password or make file unreadable by others.");
goto bad;
}
if (token() && *apass == 0) {
*apass = (char *) malloc((unsigned) strlen(tokval) + 1);
(void) strcpy(*apass, tokval);
}
break;
case ACCOUNT:
if (fstat64(fileno(cfile), &stb) >= 0
&& (stb.st_mode & 077) != 0) {
warnx("Error: .netrc file is readable by others.");
warnx("Remove account or make file unreadable by others.");
goto bad;
}
if (token() && aacct && *aacct == 0) {
*aacct = (char *) malloc((unsigned) strlen(tokval) + 1);
(void) strcpy(*aacct, tokval);
}
break;
case MACDEF:
while ((c=getc(cfile)) != EOF &&
(c == ' ' || c == '\t'))
;
if (c == EOF || c == '\n') {
printf("Missing macdef name argument.\n");
goto bad;
}
if (macnum == 16) {
printf("Limit of 16 macros have already been defined\n");
goto bad;
}
tmp = macros[macnum].mac_name;
*tmp++ = c;
for (i=0; i < 8 && (c=getc(cfile)) != EOF &&
!isspace(c); ++i) {
*tmp++ = c;
}
if (c == EOF) {
printf("Macro definition missing null line terminator.\n");
goto bad;
}
*tmp = '\0';
if (c != '\n') {
while ((c=getc(cfile)) != EOF && c != '\n');
}
if (c == EOF) {
printf("Macro definition missing null line terminator.\n");
goto bad;
}
if (macnum == 0) {
macros[macnum].mac_start = macbuf;
}
else {
macros[macnum].mac_start = macros[macnum-1].mac_end + 1;
}
tmp = macros[macnum].mac_start;
while (tmp != macbuf + 4096) {
if ((c=getc(cfile)) == EOF) {
printf("Macro definition missing null line terminator.\n");
goto bad;
}
*tmp = c;
if (*tmp == '\n') {
if (*(tmp-1) == '\0') {
macros[macnum++].mac_end = tmp - 1;
break;
}
*tmp = '\0';
}
tmp++;
}
if (tmp == macbuf + 4096) {
printf("4K macro buffer exceeded\n");
goto bad;
}
break;
default:
warnx("Unknown .netrc keyword %s", tokval);
break;
}
goto done;
}
done:
(void) fclose(cfile);
return (0);
bad:
(void) fclose(cfile);
return (-1);
}
extern "C" int
cygwin_rexec (char **ahost, unsigned short rport, char *name, char *pass,
char *cmd, int *fd2p)
{
struct sockaddr_in sin, sin2, from;
struct hostent *hp;
uint16_t port = 0;
int s, timo = 1, s3;
char c;
static char ahostbuf[INTERNET_MAX_HOST_NAME_LENGTH + 1];
__try
{
hp = cygwin_gethostbyname(*ahost);
if (hp == 0) {
cygwin_herror(*ahost);
return (-1);
}
*ahost = strcpy (ahostbuf, hp->h_name);
ruserpass(hp->h_name, &name, &pass, NULL);
if (!name)
name = getlogin ();
if (!pass)
pass = almost_null;
retry:
s = cygwin_socket(AF_INET, SOCK_STREAM, 0);
if (s < 0) {
perror("rexec: socket");
return (-1);
}
sin.sin_family = hp->h_addrtype;
sin.sin_port = rport;
bcopy(hp->h_addr, (caddr_t)&sin.sin_addr, hp->h_length);
if (cygwin_connect(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
if (errno == ECONNREFUSED && timo <= 16) {
(void) close(s);
sleep(timo);
timo *= 2;
goto retry;
}
perror(hp->h_name);
return (-1);
}
if (fd2p == 0) {
(void) write(s, "", 1);
} else {
char num[8];
int s2, sin2len;
s2 = cygwin_socket(AF_INET, SOCK_STREAM, 0);
if (s2 < 0) {
(void) close(s);
return (-1);
}
cygwin_listen(s2, 1);
sin2len = sizeof (sin2);
if (cygwin_getsockname(s2, (struct sockaddr *)&sin2, &sin2len) < 0 ||
sin2len != sizeof (sin2)) {
perror("getsockname");
(void) close(s2);
goto bad;
}
port = ntohs((uint16_t)sin2.sin_port);
(void) sprintf(num, "%u", port);
(void) write(s, num, strlen(num)+1);
{ int len = sizeof (from);
s3 = cygwin_accept(s2, (struct sockaddr *)&from, &len);
close(s2);
if (s3 < 0) {
perror("accept");
port = 0;
goto bad;
}
}
*fd2p = s3;
}
(void) write(s, name, strlen(name) + 1);
/* should public key encypt the password here */
(void) write(s, pass, strlen(pass) + 1);
(void) write(s, cmd, strlen(cmd) + 1);
if (read(s, &c, 1) != 1) {
perror(*ahost);
goto bad;
}
if (c != 0) {
while (read(s, &c, 1) == 1) {
(void) write(2, &c, 1);
if (c == '\n')
break;
}
goto bad;
}
return (s);
bad:
if (port)
(void) close(*fd2p);
(void) close(s);
}
__except (EFAULT) {}
__endtry
return (-1);
}