--- /dev/null
+/*
+ * Copyright (c) 2012 Todd C. Miller <Todd.Miller@courtesan.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <config.h>
+
+/* Large files not supported by procfs.h */
+#if defined(HAVE_PROCFS_H) || defined(HAVE_SYS_PROCFS_H)
+# undef _FILE_OFFSET_BITS
+# undef _LARGE_FILES
+#endif
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/stat.h>
+#if defined(MAJOR_IN_MKDEV)
+# include <sys/mkdev.h>
+#elif defined(MAJOR_IN_SYSMACROS)
+# include <sys/sysmacros.h>
+#endif
+#include <stdio.h>
+#ifdef STDC_HEADERS
+# include <stdlib.h>
+# include <stddef.h>
+#else
+# ifdef HAVE_STDLIB_H
+# include <stdlib.h>
+# endif
+#endif /* STDC_HEADERS */
+#ifdef HAVE_STRING_H
+# if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS)
+# include <memory.h>
+# endif
+# include <string.h>
+#endif /* HAVE_STRING_H */
+#ifdef HAVE_STRINGS_H
+# include <strings.h>
+#endif /* HAVE_STRINGS_H */
+#ifdef HAVE_UNISTD_H
+# include <unistd.h>
+#endif /* HAVE_UNISTD_H */
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#ifdef HAVE_DIRENT_H
+# include <dirent.h>
+# define NAMLEN(dirent) strlen((dirent)->d_name)
+#else
+# define dirent direct
+# define NAMLEN(dirent) (dirent)->d_namlen
+# ifdef HAVE_SYS_NDIR_H
+# include <sys/ndir.h>
+# endif
+# ifdef HAVE_SYS_DIR_H
+# include <sys/dir.h>
+# endif
+# ifdef HAVE_NDIR_H
+# include <ndir.h>
+# endif
+#endif
+#if defined(HAVE_STRUCT_KINFO_PROC_P_TDEV) || defined (HAVE_STRUCT_KINFO_PROC_KP_EPROC_E_TDEV) || defined(HAVE_STRUCT_KINFO_PROC2_P_TDEV)
+# include <sys/sysctl.h>
+#elif defined(HAVE_STRUCT_KINFO_PROC_KI_TDEV)
+# include <sys/sysctl.h>
+# include <sys/user.h>
+#endif
+#if defined(HAVE_PROCFS_H)
+# include <procfs.h>
+#elif defined(HAVE_SYS_PROCFS_H)
+# include <sys/procfs.h>
+#endif
+
+#include "sudo.h"
+
+/*
+ * How to access the tty device number in struct kinfo_proc.
+ */
+#if defined(HAVE_STRUCT_KINFO_PROC2_P_TDEV)
+# define SUDO_KERN_PROC KERN_PROC2
+# define sudo_kinfo_proc kinfo_proc2
+# define sudo_kp_tdev p_tdev
+# define sudo_kp_namelen 6
+#elif defined(HAVE_STRUCT_KINFO_PROC_P_TDEV)
+# define SUDO_KERN_PROC KERN_PROC
+# define sudo_kinfo_proc kinfo_proc
+# define sudo_kp_tdev p_tdev
+# define sudo_kp_namelen 6
+#elif defined(HAVE_STRUCT_KINFO_PROC_KI_TDEV)
+# define SUDO_KERN_PROC KERN_PROC
+# define sudo_kinfo_proc kinfo_proc
+# define sudo_kp_tdev ki_tdev
+# define sudo_kp_namelen 4
+#elif defined(HAVE_STRUCT_KINFO_PROC_KP_EPROC_E_TDEV)
+# define SUDO_KERN_PROC KERN_PROC
+# define sudo_kinfo_proc kinfo_proc
+# define sudo_kp_tdev kp_eproc.e_tdev
+# define sudo_kp_namelen 4
+#endif
+
+#if defined(sudo_kp_tdev)
+/*
+ * Like ttyname() but uses a dev_t instead of an open fd.
+ * Caller is responsible for freeing the returned string.
+ * The BSD version uses devname()
+ */
+static char *
+sudo_ttyname_dev(dev_t tdev)
+{
+ char *dev, *tty = NULL;
+ debug_decl(sudo_ttyname_dev, SUDO_DEBUG_UTIL)
+
+ /* Some versions of devname() return NULL on failure, others do not. */
+ dev = devname(tdev, S_IFCHR);
+ if (dev != NULL && *dev != '?' && *dev != '#') {
+ if (*dev != '/') {
+ /* devname() doesn't use the /dev/ prefix, add one... */
+ size_t len = sizeof(_PATH_DEV) + strlen(dev);
+ tty = emalloc(len);
+ strlcpy(tty, _PATH_DEV, len);
+ strlcat(tty, dev, len);
+ } else {
+ /* Should not happen but just in case... */
+ tty = estrdup(dev);
+ }
+ }
+ debug_return_str(tty);
+}
+#elif defined(HAVE__TTYNAME_DEV)
+extern char *_ttyname_dev(dev_t rdev, char *buffer, size_t buflen);
+
+/*
+ * Like ttyname() but uses a dev_t instead of an open fd.
+ * Caller is responsible for freeing the returned string.
+ * This version is just a wrapper around _ttyname_dev().
+ */
+static char *
+sudo_ttyname_dev(dev_t tdev)
+{
+ char buf[TTYNAME_MAX], *tty;
+ debug_decl(sudo_ttyname_dev, SUDO_DEBUG_UTIL)
+
+ tty = _ttyname_dev(tdev, buf, sizeof(buf));
+
+ debug_return_str(estrdup(tty));
+}
+#else
+/*
+ * Devices to search before doing a breadth-first scan.
+ */
+static char *search_devs[] = {
+ "/dev/console",
+ "/dev/wscons",
+ "/dev/pts/",
+ "/dev/vt/",
+ "/dev/term/",
+ "/dev/zcons/",
+ NULL
+};
+
+static char *ignore_devs[] = {
+ "/dev/fd/",
+ "/dev/stdin",
+ "/dev/stdout",
+ "/dev/stderr",
+ NULL
+};
+
+/*
+ * Do a breadth-first scan of dir looking for the specified device.
+ */
+static
+char *sudo_ttyname_scan(const char *dir, dev_t rdev, bool builtin)
+{
+ DIR *d;
+ char pathbuf[PATH_MAX], **subdirs = NULL, *devname = NULL;
+ size_t sdlen, d_len, len, num_subdirs = 0, max_subdirs = 0;
+ struct dirent *dp;
+ struct stat sb;
+ int i;
+ debug_decl(sudo_ttyname_scan, SUDO_DEBUG_UTIL)
+
+ if (dir[0] == '\0' || (d = opendir(dir)) == NULL)
+ goto done;
+
+ sdlen = strlen(dir);
+ if (dir[sdlen - 1] == '/')
+ sdlen--;
+ if (sdlen + 1 >= sizeof(pathbuf)) {
+ errno = ENAMETOOLONG;
+ warning("%.*s/", (int)sdlen, dir);
+ goto done;
+ }
+ memcpy(pathbuf, dir, sdlen);
+ pathbuf[sdlen++] = '/';
+ pathbuf[sdlen] = '\0';
+
+ while ((dp = readdir(d)) != NULL) {
+ /* Skip anything starting with "." */
+ if (dp->d_name[0] == '.')
+ continue;
+
+ d_len = NAMLEN(dp);
+ if (sdlen + d_len >= sizeof(pathbuf))
+ continue;
+ memcpy(&pathbuf[sdlen], dp->d_name, d_len + 1); /* copy NUL too */
+ d_len += sdlen;
+
+ for (i = 0; ignore_devs[i] != NULL; i++) {
+ len = strlen(ignore_devs[i]);
+ if (ignore_devs[i][len - 1] == '/')
+ len--;
+ if (d_len == len && strncmp(pathbuf, ignore_devs[i], len) == 0)
+ break;
+ }
+ if (ignore_devs[i] != NULL)
+ continue;
+ if (!builtin) {
+ /* Skip entries in search_devs; we already checked them. */
+ for (i = 0; search_devs[i] != NULL; i++) {
+ len = strlen(search_devs[i]);
+ if (search_devs[i][len - 1] == '/')
+ len--;
+ if (d_len == len && strncmp(pathbuf, search_devs[i], len) == 0)
+ break;
+ }
+ if (search_devs[i] != NULL)
+ continue;
+ }
+# if defined(HAVE_STRUCT_DIRENT_D_TYPE) && defined(DTTOIF)
+ /* Use d_type to avoid a stat() if possible. */
+ /* Convert d_type to stat-style type bits but follow links. */
+ if (dp->d_type != DT_LNK && dp->d_type != DT_CHR)
+ sb.st_mode = DTTOIF(dp->d_type);
+ else
+# endif
+ if (stat(pathbuf, &sb) == -1)
+ continue;
+ if (S_ISDIR(sb.st_mode)) {
+ if (!builtin) {
+ /* Add to list of subdirs to search. */
+ if (num_subdirs + 1 > max_subdirs) {
+ max_subdirs += 64;
+ subdirs = erealloc3(subdirs, max_subdirs, sizeof(char *));
+ }
+ subdirs[num_subdirs++] = estrdup(pathbuf);
+ }
+ continue;
+ }
+ if (S_ISCHR(sb.st_mode) && sb.st_rdev == rdev) {
+ devname = estrdup(pathbuf);
+ break;
+ }
+ }
+ closedir(d);
+
+ /* Search subdirs if we didn't find it in the root level. */
+ for (i = 0; devname == NULL && i < num_subdirs; i++)
+ devname = sudo_ttyname_scan(subdirs[i], rdev, false);
+
+done:
+ for (i = 0; i < num_subdirs; i++)
+ efree(subdirs[i]);
+ efree(subdirs);
+ debug_return_str(devname);
+}
+
+/*
+ * Like ttyname() but uses a dev_t instead of an open fd.
+ * Caller is responsible for freeing the returned string.
+ * Generic version.
+ */
+static char *
+sudo_ttyname_dev(dev_t rdev)
+{
+ struct stat sb;
+ size_t len;
+ char buf[PATH_MAX], **sd, *devname, *tty = NULL;
+ debug_decl(sudo_ttyname_dev, SUDO_DEBUG_UTIL)
+
+ /*
+ * First check search_devs.
+ */
+ for (sd = search_devs; (devname = *sd) != NULL; sd++) {
+ len = strlen(devname);
+ if (devname[len - 1] == '/') {
+ /* Special case /dev/pts */
+ if (strcmp(devname, "/dev/pts/") == 0) {
+ (void)snprintf(buf, sizeof(buf), "%spts/%u", _PATH_DEV,
+ (unsigned int)minor(rdev));
+ if (stat(buf, &sb) == 0) {
+ if (S_ISCHR(sb.st_mode) && sb.st_rdev == rdev) {
+ tty = estrdup(buf);
+ break;
+ }
+ }
+ continue;
+ }
+ /* Traverse directory */
+ tty = sudo_ttyname_scan(devname, rdev, true);
+ } else {
+ if (stat(devname, &sb) == 0) {
+ if (S_ISCHR(sb.st_mode) && sb.st_rdev == rdev) {
+ tty = estrdup(devname);
+ break;
+ }
+ }
+ }
+ }
+
+ /*
+ * Not found? Do a breadth-first traversal of /dev/.
+ */
+ if (tty == NULL)
+ tty = sudo_ttyname_scan(_PATH_DEV, rdev, false);
+
+ debug_return_str(tty);
+}
+#endif
+
+#if defined(sudo_kp_tdev)
+/*
+ * Return a string from ttyname() containing the tty to which the process is
+ * attached or NULL if there is no tty associated with the process (or its
+ * parent). First tries sysctl using the current pid, then the parent's pid.
+ * Falls back on ttyname of std{in,out,err} if that fails.
+ */
+char *
+get_process_ttyname(void)
+{
+ char *tty = NULL;
+ struct sudo_kinfo_proc *ki_proc = NULL;
+ size_t size = sizeof(*ki_proc);
+ int i, mib[6], rc;
+ debug_decl(get_process_ttyname, SUDO_DEBUG_UTIL)
+
+ /*
+ * Lookup tty for this process and, failing that, our parent.
+ * Even if we redirect std{in,out,err} the kernel should still know.
+ */
+ for (i = 0; tty == NULL && i < 2; i++) {
+ mib[0] = CTL_KERN;
+ mib[1] = SUDO_KERN_PROC;
+ mib[2] = KERN_PROC_PID;
+ mib[3] = i ? (int)getppid() : (int)getpid();
+ mib[4] = sizeof(*ki_proc);
+ mib[5] = 1;
+ do {
+ size += size / 10;
+ ki_proc = erealloc(ki_proc, size);
+ rc = sysctl(mib, sudo_kp_namelen, ki_proc, &size, NULL, 0);
+ } while (rc == -1 && errno == ENOMEM);
+ if (rc != -1) {
+ if (ki_proc->sudo_kp_tdev != (dev_t)-1) {
+ tty = sudo_ttyname_dev(ki_proc->sudo_kp_tdev);
+ if (tty == NULL) {
+ sudo_debug_printf(SUDO_DEBUG_WARN,
+ "unable to map device number %u to name",
+ ki_proc->sudo_kp_tdev);
+ }
+ }
+ } else {
+ sudo_debug_printf(SUDO_DEBUG_WARN,
+ "unable to resolve tty via KERN_PROC: %s", strerror(errno));
+ }
+ }
+ efree(ki_proc);
+
+ /* If all else fails, fall back on ttyname(). */
+ if (tty == NULL) {
+ if ((tty = ttyname(STDIN_FILENO)) != NULL ||
+ (tty = ttyname(STDOUT_FILENO)) != NULL ||
+ (tty = ttyname(STDERR_FILENO)) != NULL)
+ tty = estrdup(tty);
+ }
+
+ debug_return_str(tty);
+}
+#elif defined(HAVE_STRUCT_PSINFO_PR_TTYDEV)
+/*
+ * Return a string from ttyname() containing the tty to which the process is
+ * attached or NULL if there is no tty associated with the process (or its
+ * parent). First tries /proc/pid/psinfo, then /proc/ppid/psinfo.
+ * Falls back on ttyname of std{in,out,err} if that fails.
+ */
+char *
+get_process_ttyname(void)
+{
+ char path[PATH_MAX], *tty = NULL;
+ struct stat sb;
+ struct psinfo psinfo;
+ ssize_t nread;
+ int i, fd;
+ debug_decl(get_process_ttyname, SUDO_DEBUG_UTIL)
+
+ /* Try to determine the tty from pr_ttydev in /proc/pid/psinfo. */
+ for (i = 0; tty == NULL && i < 2; i++) {
+ (void)snprintf(path, sizeof(path), "/proc/%u/psinfo",
+ i ? (unsigned int)getppid() : (unsigned int)getpid());
+ if ((fd = open(path, O_RDONLY, 0)) == -1)
+ continue;
+ nread = read(fd, &psinfo, sizeof(psinfo));
+ close(fd);
+ if (nread == (ssize_t)sizeof(psinfo) && psinfo.pr_ttydev != (dev_t)-1) {
+ tty = sudo_ttyname_dev(psinfo.pr_ttydev);
+ }
+ }
+
+ /* If all else fails, fall back on ttyname(). */
+ if (tty == NULL) {
+ if ((tty = ttyname(STDIN_FILENO)) != NULL ||
+ (tty = ttyname(STDOUT_FILENO)) != NULL ||
+ (tty = ttyname(STDERR_FILENO)) != NULL)
+ tty = estrdup(tty);
+ }
+
+ debug_return_str(tty);
+}
+#elif defined(__linux__)
+/*
+ * Return a string from ttyname() containing the tty to which the process is
+ * attached or NULL if there is no tty associated with the process (or its
+ * parent). First tries field 7 in /proc/pid/stat, then /proc/ppid/stat.
+ * Falls back on ttyname of std{in,out,err} if that fails.
+ */
+char *
+get_process_ttyname(void)
+{
+ char *line = NULL, *tty = NULL;
+ size_t linesize = 0;
+ ssize_t len;
+ int i;
+ debug_decl(get_process_ttyname, SUDO_DEBUG_UTIL)
+
+ /* Try to determine the tty from pr_ttydev in /proc/pid/psinfo. */
+ for (i = 0; tty == NULL && i < 2; i++) {
+ FILE *fp;
+ char path[PATH_MAX];
+ (void)snprintf(path, sizeof(path), "/proc/%u/stat",
+ i ? (unsigned int)getppid() : (unsigned int)getpid());
+ if ((fp = fopen(path, "r")) == NULL)
+ continue;
+ len = getline(&line, &linesize, fp);
+ fclose(fp);
+ if (len != -1) {
+ /* Field 7 is the tty dev (0 if no tty) */
+ char *cp = line;
+ int field = 1;
+ while (*cp != '\0') {
+ if (*cp++ == ' ') {
+ if (++field == 7) {
+ dev_t tdev = (dev_t)atoi(cp);
+ if (tdev > 0)
+ tty = sudo_ttyname_dev(tdev);
+ break;
+ }
+ }
+ }
+ }
+ }
+ efree(line);
+
+ /* If all else fails, fall back on ttyname(). */
+ if (tty == NULL) {
+ if ((tty = ttyname(STDIN_FILENO)) != NULL ||
+ (tty = ttyname(STDOUT_FILENO)) != NULL ||
+ (tty = ttyname(STDERR_FILENO)) != NULL)
+ tty = estrdup(tty);
+ }
+
+ debug_return_str(tty);
+}
+#else
+/*
+ * Return a string from ttyname() containing the tty to which the process is
+ * attached or NULL if there is no tty associated with the process.
+ * parent).
+ */
+char *
+get_process_ttyname(void)
+{
+ char *tty;
+ debug_decl(get_process_ttyname, SUDO_DEBUG_UTIL)
+
+ if ((tty = ttyname(STDIN_FILENO)) == NULL) {
+ if ((tty = ttyname(STDOUT_FILENO)) == NULL)
+ tty = ttyname(STDERR_FILENO);
+ }
+
+ debug_return_str(estrdup(tty));
+}
+#endif
projects / debian / sudo / blobdiff