158f0484fSRodney W. Grimes /*- 258f0484fSRodney W. Grimes * Copyright (c) 1991, 1993 358f0484fSRodney W. Grimes * The Regents of the University of California. All rights reserved. 458f0484fSRodney W. Grimes * 558f0484fSRodney W. Grimes * Redistribution and use in source and binary forms, with or without 658f0484fSRodney W. Grimes * modification, are permitted provided that the following conditions 758f0484fSRodney W. Grimes * are met: 858f0484fSRodney W. Grimes * 1. Redistributions of source code must retain the above copyright 958f0484fSRodney W. Grimes * notice, this list of conditions and the following disclaimer. 1058f0484fSRodney W. Grimes * 2. Redistributions in binary form must reproduce the above copyright 1158f0484fSRodney W. Grimes * notice, this list of conditions and the following disclaimer in the 1258f0484fSRodney W. Grimes * documentation and/or other materials provided with the distribution. 1358f0484fSRodney W. Grimes * 4. Neither the name of the University nor the names of its contributors 1458f0484fSRodney W. Grimes * may be used to endorse or promote products derived from this software 1558f0484fSRodney W. Grimes * without specific prior written permission. 1658f0484fSRodney W. Grimes * 1758f0484fSRodney W. Grimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 1858f0484fSRodney W. Grimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1958f0484fSRodney W. Grimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2058f0484fSRodney W. Grimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2158f0484fSRodney W. Grimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2258f0484fSRodney W. Grimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2358f0484fSRodney W. Grimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2458f0484fSRodney W. Grimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2558f0484fSRodney W. Grimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2658f0484fSRodney W. Grimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2758f0484fSRodney W. Grimes * SUCH DAMAGE. 2858f0484fSRodney W. Grimes */ 2958f0484fSRodney W. Grimes 3058f0484fSRodney W. Grimes #if defined(LIBC_SCCS) && !defined(lint) 3158f0484fSRodney W. Grimes static char sccsid[] = "@(#)exec.c 8.1 (Berkeley) 6/4/93"; 3258f0484fSRodney W. Grimes #endif /* LIBC_SCCS and not lint */ 3322626efaSDavid E. O'Brien #include <sys/cdefs.h> 3422626efaSDavid E. O'Brien __FBSDID("$FreeBSD$"); 3558f0484fSRodney W. Grimes 36d201fe46SDaniel Eischen #include "namespace.h" 3758f0484fSRodney W. Grimes #include <sys/param.h> 3858f0484fSRodney W. Grimes #include <sys/types.h> 391df595f2SBruce Evans #include <sys/stat.h> 4058f0484fSRodney W. Grimes #include <errno.h> 4158f0484fSRodney W. Grimes #include <unistd.h> 4258f0484fSRodney W. Grimes #include <stdlib.h> 4358f0484fSRodney W. Grimes #include <string.h> 4458f0484fSRodney W. Grimes #include <stdio.h> 4558f0484fSRodney W. Grimes #include <paths.h> 4658f0484fSRodney W. Grimes 4758f0484fSRodney W. Grimes #include <stdarg.h> 48d201fe46SDaniel Eischen #include "un-namespace.h" 4958f0484fSRodney W. Grimes 5058f0484fSRodney W. Grimes extern char **environ; 5158f0484fSRodney W. Grimes 5258f0484fSRodney W. Grimes int 5358f0484fSRodney W. Grimes execl(const char *name, const char *arg, ...) 5458f0484fSRodney W. Grimes { 5558f0484fSRodney W. Grimes va_list ap; 5658f0484fSRodney W. Grimes char **argv; 57dea625c8SDag-Erling Smørgrav int n; 58dea625c8SDag-Erling Smørgrav 5958f0484fSRodney W. Grimes va_start(ap, arg); 607ea577e5SDag-Erling Smørgrav n = 1; 61dea625c8SDag-Erling Smørgrav while (va_arg(ap, char *) != NULL) 62dea625c8SDag-Erling Smørgrav n++; 6358f0484fSRodney W. Grimes va_end(ap); 64af806462SDag-Erling Smørgrav argv = alloca((n + 1) * sizeof(*argv)); 65ce04fea4SPeter Wemm if (argv == NULL) { 66ce04fea4SPeter Wemm errno = ENOMEM; 6758f0484fSRodney W. Grimes return (-1); 68ce04fea4SPeter Wemm } 69dea625c8SDag-Erling Smørgrav va_start(ap, arg); 707ea577e5SDag-Erling Smørgrav n = 1; 71af806462SDag-Erling Smørgrav argv[0] = (char *)arg; 72dea625c8SDag-Erling Smørgrav while ((argv[n] = va_arg(ap, char *)) != NULL) 73dea625c8SDag-Erling Smørgrav n++; 74dea625c8SDag-Erling Smørgrav va_end(ap); 75d201fe46SDaniel Eischen return (_execve(name, argv, environ)); 7658f0484fSRodney W. Grimes } 7758f0484fSRodney W. Grimes 7858f0484fSRodney W. Grimes int 7958f0484fSRodney W. Grimes execle(const char *name, const char *arg, ...) 8058f0484fSRodney W. Grimes { 8158f0484fSRodney W. Grimes va_list ap; 8258f0484fSRodney W. Grimes char **argv, **envp; 83af806462SDag-Erling Smørgrav int n; 8458f0484fSRodney W. Grimes 8558f0484fSRodney W. Grimes va_start(ap, arg); 86af806462SDag-Erling Smørgrav n = 1; 87af806462SDag-Erling Smørgrav while (va_arg(ap, char *) != NULL) 88af806462SDag-Erling Smørgrav n++; 8958f0484fSRodney W. Grimes va_end(ap); 90af806462SDag-Erling Smørgrav argv = alloca((n + 1) * sizeof(*argv)); 91ce04fea4SPeter Wemm if (argv == NULL) { 92ce04fea4SPeter Wemm errno = ENOMEM; 9358f0484fSRodney W. Grimes return (-1); 94ce04fea4SPeter Wemm } 95af806462SDag-Erling Smørgrav va_start(ap, arg); 96af806462SDag-Erling Smørgrav n = 1; 97af806462SDag-Erling Smørgrav argv[0] = (char *)arg; 98af806462SDag-Erling Smørgrav while ((argv[n] = va_arg(ap, char *)) != NULL) 99af806462SDag-Erling Smørgrav n++; 100af806462SDag-Erling Smørgrav envp = va_arg(ap, char **); 101af806462SDag-Erling Smørgrav va_end(ap); 102d201fe46SDaniel Eischen return (_execve(name, argv, envp)); 10358f0484fSRodney W. Grimes } 10458f0484fSRodney W. Grimes 10558f0484fSRodney W. Grimes int 10658f0484fSRodney W. Grimes execlp(const char *name, const char *arg, ...) 10758f0484fSRodney W. Grimes { 10858f0484fSRodney W. Grimes va_list ap; 10958f0484fSRodney W. Grimes char **argv; 110ce04fea4SPeter Wemm int n; 11158f0484fSRodney W. Grimes 11258f0484fSRodney W. Grimes va_start(ap, arg); 113ce04fea4SPeter Wemm n = 1; 114ce04fea4SPeter Wemm while (va_arg(ap, char *) != NULL) 115ce04fea4SPeter Wemm n++; 11658f0484fSRodney W. Grimes va_end(ap); 117ce04fea4SPeter Wemm argv = alloca((n + 1) * sizeof(*argv)); 118ce04fea4SPeter Wemm if (argv == NULL) { 119ce04fea4SPeter Wemm errno = ENOMEM; 12058f0484fSRodney W. Grimes return (-1); 12158f0484fSRodney W. Grimes } 122ce04fea4SPeter Wemm va_start(ap, arg); 123ce04fea4SPeter Wemm n = 1; 124ce04fea4SPeter Wemm argv[0] = (char *)arg; 125ce04fea4SPeter Wemm while ((argv[n] = va_arg(ap, char *)) != NULL) 126ce04fea4SPeter Wemm n++; 127ce04fea4SPeter Wemm va_end(ap); 128ce04fea4SPeter Wemm return (execvp(name, argv)); 129ce04fea4SPeter Wemm } 13058f0484fSRodney W. Grimes 13158f0484fSRodney W. Grimes int 13258f0484fSRodney W. Grimes execv(name, argv) 13358f0484fSRodney W. Grimes const char *name; 13458f0484fSRodney W. Grimes char * const *argv; 13558f0484fSRodney W. Grimes { 136d201fe46SDaniel Eischen (void)_execve(name, argv, environ); 13758f0484fSRodney W. Grimes return (-1); 13858f0484fSRodney W. Grimes } 13958f0484fSRodney W. Grimes 14058f0484fSRodney W. Grimes int 14109f49aabSGordon Tetlow execvp(const char *name, char * const *argv) 14209f49aabSGordon Tetlow { 143947aa542SDavid Xu return (execvpe(name, argv, environ)); 14409f49aabSGordon Tetlow } 14509f49aabSGordon Tetlow 146947aa542SDavid Xu static int 147947aa542SDavid Xu execvPe(name, path, argv, envp) 14858f0484fSRodney W. Grimes const char *name; 14909f49aabSGordon Tetlow const char *path; 15058f0484fSRodney W. Grimes char * const *argv; 151947aa542SDavid Xu char * const *envp; 15258f0484fSRodney W. Grimes { 153a2c06222SBruce Evans char **memp; 15422626efaSDavid E. O'Brien int cnt, lp, ln; 15522626efaSDavid E. O'Brien char *p; 1561df595f2SBruce Evans int eacces, save_errno; 15709f49aabSGordon Tetlow char *bp, *cur, buf[MAXPATHLEN]; 1581df595f2SBruce Evans struct stat sb; 15958f0484fSRodney W. Grimes 1601df595f2SBruce Evans eacces = 0; 1611ad652a5SBruce Evans 16258f0484fSRodney W. Grimes /* If it's an absolute or relative path name, it's easy. */ 16358f0484fSRodney W. Grimes if (index(name, '/')) { 16458f0484fSRodney W. Grimes bp = (char *)name; 16509f49aabSGordon Tetlow cur = NULL; 16658f0484fSRodney W. Grimes goto retry; 16758f0484fSRodney W. Grimes } 16858f0484fSRodney W. Grimes bp = buf; 16958f0484fSRodney W. Grimes 17076663101SBruce Evans /* If it's an empty path name, fail in the usual POSIX way. */ 17176663101SBruce Evans if (*name == '\0') { 17276663101SBruce Evans errno = ENOENT; 17376663101SBruce Evans return (-1); 17476663101SBruce Evans } 17576663101SBruce Evans 176ce04fea4SPeter Wemm cur = alloca(strlen(path) + 1); 177ce04fea4SPeter Wemm if (cur == NULL) { 178ce04fea4SPeter Wemm errno = ENOMEM; 179ce04fea4SPeter Wemm return (-1); 180ce04fea4SPeter Wemm } 181ce04fea4SPeter Wemm strcpy(cur, path); 182270f6e44SBruce Evans while ((p = strsep(&cur, ":")) != NULL) { 18358f0484fSRodney W. Grimes /* 18458f0484fSRodney W. Grimes * It's a SHELL path -- double, leading and trailing colons 18558f0484fSRodney W. Grimes * mean the current directory. 18658f0484fSRodney W. Grimes */ 187270f6e44SBruce Evans if (*p == '\0') { 18858f0484fSRodney W. Grimes p = "."; 18958f0484fSRodney W. Grimes lp = 1; 19058f0484fSRodney W. Grimes } else 19158f0484fSRodney W. Grimes lp = strlen(p); 19258f0484fSRodney W. Grimes ln = strlen(name); 19358f0484fSRodney W. Grimes 19458f0484fSRodney W. Grimes /* 19558f0484fSRodney W. Grimes * If the path is too long complain. This is a possible 19658f0484fSRodney W. Grimes * security issue; given a way to make the path too long 19758f0484fSRodney W. Grimes * the user may execute the wrong program. 19858f0484fSRodney W. Grimes */ 19958f0484fSRodney W. Grimes if (lp + ln + 2 > sizeof(buf)) { 20009f49aabSGordon Tetlow (void)_write(STDERR_FILENO, "execvP: ", 8); 2019233c4d9SJason Evans (void)_write(STDERR_FILENO, p, lp); 2029233c4d9SJason Evans (void)_write(STDERR_FILENO, ": path too long\n", 20392927338SJason Evans 16); 20458f0484fSRodney W. Grimes continue; 20558f0484fSRodney W. Grimes } 20658f0484fSRodney W. Grimes bcopy(p, buf, lp); 20758f0484fSRodney W. Grimes buf[lp] = '/'; 20858f0484fSRodney W. Grimes bcopy(name, buf + lp + 1, ln); 20958f0484fSRodney W. Grimes buf[lp + ln + 1] = '\0'; 21058f0484fSRodney W. Grimes 211d201fe46SDaniel Eischen retry: (void)_execve(bp, argv, environ); 21258f0484fSRodney W. Grimes switch (errno) { 2131df595f2SBruce Evans case E2BIG: 2141df595f2SBruce Evans goto done; 2151df595f2SBruce Evans case ELOOP: 2161df595f2SBruce Evans case ENAMETOOLONG: 21758f0484fSRodney W. Grimes case ENOENT: 21858f0484fSRodney W. Grimes break; 21958f0484fSRodney W. Grimes case ENOEXEC: 220a2c06222SBruce Evans for (cnt = 0; argv[cnt]; ++cnt) 221a2c06222SBruce Evans ; 2225fe5a4ddSPeter Wemm memp = alloca((cnt + 2) * sizeof(char *)); 223ce04fea4SPeter Wemm if (memp == NULL) { 224ce04fea4SPeter Wemm /* errno = ENOMEM; XXX override ENOEXEC? */ 22558f0484fSRodney W. Grimes goto done; 226ce04fea4SPeter Wemm } 22758f0484fSRodney W. Grimes memp[0] = "sh"; 22858f0484fSRodney W. Grimes memp[1] = bp; 22958f0484fSRodney W. Grimes bcopy(argv + 1, memp + 2, cnt * sizeof(char *)); 230d201fe46SDaniel Eischen (void)_execve(_PATH_BSHELL, memp, environ); 23158f0484fSRodney W. Grimes goto done; 2321df595f2SBruce Evans case ENOMEM: 2331df595f2SBruce Evans goto done; 2341df595f2SBruce Evans case ENOTDIR: 2351df595f2SBruce Evans break; 23658f0484fSRodney W. Grimes case ETXTBSY: 2371df595f2SBruce Evans /* 2381df595f2SBruce Evans * We used to retry here, but sh(1) doesn't. 2391df595f2SBruce Evans */ 2401df595f2SBruce Evans goto done; 24158f0484fSRodney W. Grimes default: 2421df595f2SBruce Evans /* 2431df595f2SBruce Evans * EACCES may be for an inaccessible directory or 2441df595f2SBruce Evans * a non-executable file. Call stat() to decide 2451df595f2SBruce Evans * which. This also handles ambiguities for EFAULT 2461df595f2SBruce Evans * and EIO, and undocumented errors like ESTALE. 2471df595f2SBruce Evans * We hope that the race for a stat() is unimportant. 2481df595f2SBruce Evans */ 2491df595f2SBruce Evans save_errno = errno; 25070df31a6SBruce Evans if (stat(bp, &sb) != 0) 2511df595f2SBruce Evans break; 2521df595f2SBruce Evans if (save_errno == EACCES) { 2531df595f2SBruce Evans eacces = 1; 2541df595f2SBruce Evans continue; 2551df595f2SBruce Evans } 2561df595f2SBruce Evans errno = save_errno; 25758f0484fSRodney W. Grimes goto done; 25858f0484fSRodney W. Grimes } 25958f0484fSRodney W. Grimes } 26058f0484fSRodney W. Grimes if (eacces) 26158f0484fSRodney W. Grimes errno = EACCES; 2621df595f2SBruce Evans else 26358f0484fSRodney W. Grimes errno = ENOENT; 264ce04fea4SPeter Wemm done: 26558f0484fSRodney W. Grimes return (-1); 26658f0484fSRodney W. Grimes } 267947aa542SDavid Xu 268947aa542SDavid Xu int 269947aa542SDavid Xu execvP(const char *name, const char *path, char * const argv[]) 270947aa542SDavid Xu { 271947aa542SDavid Xu return execvPe(name, path, argv, environ); 272947aa542SDavid Xu } 273947aa542SDavid Xu 274947aa542SDavid Xu int 275947aa542SDavid Xu execvpe(const char *name, char * const argv[], char * const envp[]) 276947aa542SDavid Xu { 277947aa542SDavid Xu const char *path; 278947aa542SDavid Xu 279947aa542SDavid Xu /* Get the path we're searching. */ 280947aa542SDavid Xu if ((path = getenv("PATH")) == NULL) 281947aa542SDavid Xu path = _PATH_DEFPATH; 282947aa542SDavid Xu 283947aa542SDavid Xu return (execvPe(name, path, argv, envp)); 284947aa542SDavid Xu } 285