/*
* Copyright (c) 2012-2014 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/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/param.h>
# include <sys/sysctl.h>
#elif defined(HAVE_STRUCT_KINFO_PROC_KI_TDEV)
# include <sys/param.h>
# 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
#ifdef HAVE_PSTAT_GETPROC
# include <sys/param.h>
# include <sys/pstat.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));
}
#elif defined(HAVE_STRUCT_PSINFO_PR_TTYDEV) || defined(HAVE_PSTAT_GETPROC) || defined(__linux__)
/*
* 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 = NULL;
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;
unsigned int i;
debug_decl(sudo_ttyname_scan, SUDO_DEBUG_UTIL)
if (dir[0] == '\0' || (d = opendir(dir)) == NULL)
goto done;
sudo_debug_printf(SUDO_DEBUG_INFO, "scanning for dev %u in %s",
(unsigned int)rdev, dir);
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)
/*
* Convert dp->d_type to sb.st_mode to avoid a stat(2) if possible.
* We can't use it for links (since we want to follow them) or
* char devs (since we need st_rdev to compare the device number).
*/
if (dp->d_type != DT_UNKNOWN && 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);
sudo_debug_printf(SUDO_DEBUG_INFO, "resolved dev %u as %s",
(unsigned int)rdev, pathbuf);
goto done;
}
}
/* 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:
if (d != NULL)
closedir(d);
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 common tty devices.
*/
for (sd = search_devs; tty == NULL && (devname = *sd) != NULL; sd++) {
len = strlen(devname);
if (devname[len - 1] == '/') {
if (strcmp(devname, "/dev/pts/") == 0) {
/* Special case /dev/pts */
(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);
}
sudo_debug_printf(SUDO_DEBUG_INFO, "comparing dev %u to %s: %s",
(unsigned int)rdev, buf, tty ? "yes" : "no");
} else {
/* 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);
}
}
}
/*
* 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 the process has no controlling tty.
*/
char *
get_process_ttyname(void)
{
char *tty = NULL;
struct sudo_kinfo_proc *ki_proc = NULL;
size_t size = sizeof(*ki_proc);
int mib[6], rc;
debug_decl(get_process_ttyname, SUDO_DEBUG_UTIL)
/*
* Lookup controlling tty for this process via sysctl.
* This will work even if std{in,out,err} are redirected.
*/
mib[0] = CTL_KERN;
mib[1] = SUDO_KERN_PROC;
mib[2] = KERN_PROC_PID;
mib[3] = (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 ((dev_t)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);
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 the process has no controlling tty.
*/
char *
get_process_ttyname(void)
{
char path[PATH_MAX], *tty = NULL;
struct psinfo psinfo;
ssize_t nread;
int fd;
debug_decl(get_process_ttyname, SUDO_DEBUG_UTIL)
/* Try to determine the tty from pr_ttydev in /proc/pid/psinfo. */
snprintf(path, sizeof(path), "/proc/%u/psinfo", (unsigned int)getpid());
if ((fd = open(path, O_RDONLY, 0)) != -1) {
nread = read(fd, &psinfo, sizeof(psinfo));
close(fd);
if (nread == (ssize_t)sizeof(psinfo)) {
dev_t rdev = (dev_t)psinfo.pr_ttydev;
#if defined(_AIX) && defined(DEVNO64)
if (psinfo.pr_ttydev & DEVNO64)
rdev = makedev(major64(psinfo.pr_ttydev), minor64(psinfo.pr_ttydev));
#endif
if (rdev != (dev_t)-1)
tty = sudo_ttyname_dev(rdev);
}
}
debug_return_str(tty);
}
#elif defined(__linux__)
/*
* Return a string from ttyname() containing the tty to which the process is
* attached or NULL if the process has no controlling tty.
*/
char *
get_process_ttyname(void)
{
char path[PATH_MAX], *line = NULL, *tty = NULL;
size_t linesize = 0;
ssize_t len;
FILE *fp;
debug_decl(get_process_ttyname, SUDO_DEBUG_UTIL)
/* Try to determine the tty from tty_nr in /proc/pid/stat. */
snprintf(path, sizeof(path), "/proc/%u/stat", (unsigned int)getpid());
if ((fp = fopen(path, "r")) != NULL) {
len = getline(&line, &linesize, fp);
fclose(fp);
if (len != -1) {
/* Field 7 is the tty dev (0 if no tty) */
char *cp = line;
char *ep = line;
const char *errstr;
int field = 0;
while (*++ep != '\0') {
if (*ep == ' ') {
*ep = '\0';
if (++field == 7) {
dev_t tdev = strtonum(cp, INT_MIN, INT_MAX, &errstr);
if (errstr) {
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
"%s: tty device %s: %s", path, cp, errstr);
}
if (tdev > 0)
tty = sudo_ttyname_dev(tdev);
break;
}
cp = ep + 1;
}
}
}
efree(line);
}
debug_return_str(tty);
}
#elif defined(HAVE_PSTAT_GETPROC)
/*
* Return a string from ttyname() containing the tty to which the process is
* attached or NULL if the process has no controlling tty.
*/
char *
get_process_ttyname(void)
{
struct pst_status pstat;
char *tty = NULL;
int rc;
debug_decl(get_process_ttyname, SUDO_DEBUG_UTIL)
/*
* Determine the tty from psdev in struct pst_status.
* We may get EOVERFLOW if the whole thing doesn't fit but that is OK.
*/
rc = pstat_getproc(&pstat, sizeof(pstat), (size_t)0, (int)getpid());
if (rc != -1 || errno == EOVERFLOW) {
if (pstat.pst_term.psd_major != -1 && pstat.pst_term.psd_minor != -1) {
tty = sudo_ttyname_dev(makedev(pstat.pst_term.psd_major,
pstat.pst_term.psd_minor));
}
}
debug_return_str(tty);
}
#else
/*
* Return a string from ttyname() containing the tty to which the process is
* attached or NULL if the process has no controlling tty.
*/
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
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