diff options
Diffstat (limited to 'crypto/heimdal/appl/ftp/ftpd/popen.c')
| -rw-r--r-- | crypto/heimdal/appl/ftp/ftpd/popen.c | 224 |
1 files changed, 224 insertions, 0 deletions
diff --git a/crypto/heimdal/appl/ftp/ftpd/popen.c b/crypto/heimdal/appl/ftp/ftpd/popen.c new file mode 100644 index 000000000000..5f36813a195b --- /dev/null +++ b/crypto/heimdal/appl/ftp/ftpd/popen.c @@ -0,0 +1,224 @@ +/* + * Copyright (c) 1988, 1993, 1994 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software written by Ken Arnold and + * published in UNIX Review, Vol. 6, No. 8. + * + * 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. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 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. + * + */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +RCSID("$Id: popen.c,v 1.19 1999/09/16 20:38:45 assar Exp $"); +#endif + +#include <sys/types.h> +#ifdef TIME_WITH_SYS_TIME +#include <sys/time.h> +#include <time.h> +#elif defined(HAVE_SYS_TIME_H) +#include <sys/time.h> +#else +#include <time.h> +#endif +#ifdef HAVE_SYS_RESOURCE_H +#include <sys/resource.h> +#endif +#include <sys/wait.h> + +#include <errno.h> +#include <glob.h> +#include <signal.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#include "extern.h" + +#include <roken.h> + +/* + * Special version of popen which avoids call to shell. This ensures + * no one may create a pipe to a hidden program as a side effect of a + * list or dir command. + */ +static int *pids; +static int fds; + +extern int dochroot; + +/* return path prepended with ~ftp if that file exists, otherwise + * return path unchanged + */ + +const char * +ftp_rooted(const char *path) +{ + static char home[MaxPathLen] = ""; + static char newpath[MaxPathLen]; + struct passwd *pwd; + + if(!home[0]) + if((pwd = k_getpwnam("ftp"))) + strlcpy(home, pwd->pw_dir, sizeof(home)); + snprintf(newpath, sizeof(newpath), "%s/%s", home, path); + if(access(newpath, X_OK)) + strlcpy(newpath, path, sizeof(newpath)); + return newpath; +} + + +FILE * +ftpd_popen(char *program, char *type, int do_stderr, int no_glob) +{ + char *cp; + FILE *iop; + int argc, gargc, pdes[2], pid; + char **pop, *argv[100], *gargv[1000]; + char *foo; + + if (strcmp(type, "r") && strcmp(type, "w")) + return (NULL); + + if (!pids) { + + /* This function is ugly and should be rewritten, in + * modern unices there is no such thing as a maximum + * filedescriptor. + */ + + fds = getdtablesize(); + pids = (int*)calloc(fds, sizeof(int)); + if(!pids) + return NULL; + } + if (pipe(pdes) < 0) + return (NULL); + + /* break up string into pieces */ + foo = NULL; + for (argc = 0, cp = program;; cp = NULL) { + if (!(argv[argc++] = strtok_r(cp, " \t\n", &foo))) + break; + } + + gargv[0] = (char*)ftp_rooted(argv[0]); + /* glob each piece */ + for (gargc = argc = 1; argv[argc]; argc++) { + glob_t gl; + int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE; + + memset(&gl, 0, sizeof(gl)); + if (no_glob || glob(argv[argc], flags, NULL, &gl)) + gargv[gargc++] = strdup(argv[argc]); + else + for (pop = gl.gl_pathv; *pop; pop++) + gargv[gargc++] = strdup(*pop); + globfree(&gl); + } + gargv[gargc] = NULL; + + iop = NULL; + switch(pid = fork()) { + case -1: /* error */ + close(pdes[0]); + close(pdes[1]); + goto pfree; + /* NOTREACHED */ + case 0: /* child */ + if (*type == 'r') { + if (pdes[1] != STDOUT_FILENO) { + dup2(pdes[1], STDOUT_FILENO); + close(pdes[1]); + } + if(do_stderr) + dup2(STDOUT_FILENO, STDERR_FILENO); + close(pdes[0]); + } else { + if (pdes[0] != STDIN_FILENO) { + dup2(pdes[0], STDIN_FILENO); + close(pdes[0]); + } + close(pdes[1]); + } + execv(gargv[0], gargv); + gargv[0] = argv[0]; + execv(gargv[0], gargv); + _exit(1); + } + /* parent; assume fdopen can't fail... */ + if (*type == 'r') { + iop = fdopen(pdes[0], type); + close(pdes[1]); + } else { + iop = fdopen(pdes[1], type); + close(pdes[0]); + } + pids[fileno(iop)] = pid; + +pfree: + for (argc = 1; gargv[argc] != NULL; argc++) + free(gargv[argc]); + + + return (iop); +} + +int +ftpd_pclose(FILE *iop) +{ + int fdes, status; + pid_t pid; + sigset_t sigset, osigset; + + /* + * pclose returns -1 if stream is not associated with a + * `popened' command, or, if already `pclosed'. + */ + if (pids == 0 || pids[fdes = fileno(iop)] == 0) + return (-1); + fclose(iop); + sigemptyset(&sigset); + sigaddset(&sigset, SIGINT); + sigaddset(&sigset, SIGQUIT); + sigaddset(&sigset, SIGHUP); + sigprocmask(SIG_BLOCK, &sigset, &osigset); + while ((pid = waitpid(pids[fdes], &status, 0)) < 0 && errno == EINTR) + continue; + sigprocmask(SIG_SETMASK, &osigset, NULL); + pids[fdes] = 0; + if (pid < 0) + return (pid); + if (WIFEXITED(status)) + return (WEXITSTATUS(status)); + return (1); +} |