Adding upstream version 1.9.5p2.upstream/1.9.5p2upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 338 insertions, 0 deletions

diff --git a/src/ttyname.c b/src/ttyname.c
new file mode 100644
index 0000000..47e4ab1
--- /dev/null
+++ b/src/ttyname.c
@@ -0,0 +1,338 @@
+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 2012-2020 Todd C. Miller <Todd.Miller@sudo.ws>
+ *
+ * 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.
+ */
+
+/*
+ * This is an open source non-commercial project. Dear PVS-Studio, please check it.
+ * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
+ */
+
+#include <config.h>
+
+/* Large files not supported by procfs.h on Solaris. */
+#if defined(HAVE_STRUCT_PSINFO_PR_TTYDEV)
+# 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>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <dirent.h>
+#if defined(HAVE_KINFO_PROC2_NETBSD) || defined (HAVE_KINFO_PROC_OPENBSD) || defined(HAVE_KINFO_PROC_44BSD)
+# include <sys/sysctl.h>
+#elif defined(HAVE_KINFO_PROC_FREEBSD)
+# 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/pstat.h>
+#endif
+
+#include "sudo.h"
+
+/*
+ * How to access the tty device number in struct kinfo_proc.
+ */
+#if defined(HAVE_KINFO_PROC2_NETBSD)
+# 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_KINFO_PROC_OPENBSD)
+# 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_KINFO_PROC_FREEBSD)
+# 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_KINFO_PROC_44BSD)
+# 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)
+/*
+ * Store the name of the tty to which the process is attached in name.
+ * Returns name on success and NULL on failure, setting errno.
+ */
+char *
+get_process_ttyname(char *name, size_t namelen)
+{
+    struct sudo_kinfo_proc *ki_proc = NULL;
+    size_t size = sizeof(*ki_proc);
+    int mib[6], rc, serrno = errno;
+    char *ret = NULL;
+    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;
+    for (;;) {
+	struct sudo_kinfo_proc *kp;
+
+	size += size / 10;
+	if ((kp = realloc(ki_proc, size)) == NULL) {
+	    rc = -1;
+	    break;		/* really out of memory. */
+	}
+	ki_proc = kp;
+	rc = sysctl(mib, sudo_kp_namelen, ki_proc, &size, NULL, 0);
+	if (rc != -1 || errno != ENOMEM)
+	    break;
+    }
+    errno = ENOENT;
+    if (rc != -1) {
+	if ((dev_t)ki_proc->sudo_kp_tdev != (dev_t)-1) {
+	    errno = serrno;
+	    ret = sudo_ttyname_dev(ki_proc->sudo_kp_tdev, name, namelen);
+	    if (ret == NULL) {
+		sudo_debug_printf(SUDO_DEBUG_WARN|SUDO_DEBUG_LINENO|SUDO_DEBUG_ERRNO,
+		    "unable to map device number %u to name",
+		    ki_proc->sudo_kp_tdev);
+	    }
+	}
+    } else {
+	sudo_debug_printf(SUDO_DEBUG_WARN|SUDO_DEBUG_LINENO|SUDO_DEBUG_ERRNO,
+	    "unable to resolve tty via KERN_PROC");
+    }
+    free(ki_proc);
+
+    debug_return_str(ret);
+}
+#elif defined(HAVE_STRUCT_PSINFO_PR_TTYDEV)
+/*
+ * Store the name of the tty to which the process is attached in name.
+ * Returns name on success and NULL on failure, setting errno.
+ */
+char *
+get_process_ttyname(char *name, size_t namelen)
+{
+    char path[PATH_MAX], *ret = NULL;
+    struct psinfo psinfo;
+    ssize_t nread;
+    int fd, serrno = errno;
+    debug_decl(get_process_ttyname, SUDO_DEBUG_UTIL);
+
+    /* Try to determine the tty from pr_ttydev in /proc/pid/psinfo. */
+    (void)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) && sizeof(dev_t) == 4)
+		rdev = makedev(major64(psinfo.pr_ttydev), minor64(psinfo.pr_ttydev));
+#endif
+	    if (rdev != (dev_t)-1) {
+		errno = serrno;
+		ret = sudo_ttyname_dev(rdev, name, namelen);
+		goto done;
+	    }
+	}
+    }
+    errno = ENOENT;
+
+done:
+    if (ret == NULL)
+	sudo_debug_printf(SUDO_DEBUG_WARN|SUDO_DEBUG_LINENO|SUDO_DEBUG_ERRNO,
+	    "unable to resolve tty via %s", path);
+
+    debug_return_str(ret);
+}
+#elif defined(__linux__)
+/*
+ * Store the name of the tty to which the process is attached in name.
+ * Returns name on success and NULL on failure, setting errno.
+ */
+char *
+get_process_ttyname(char *name, size_t namelen)
+{
+    const char path[] = "/proc/self/stat";
+    char *cp, buf[1024];
+    char *ret = NULL;
+    int serrno = errno;
+    ssize_t nread;
+    int fd;
+    debug_decl(get_process_ttyname, SUDO_DEBUG_UTIL);
+
+    /*
+     * Try to determine the tty from tty_nr in /proc/self/stat.
+     * Ignore /proc/self/stat if it contains embedded NUL bytes.
+     */
+    if ((fd = open(path, O_RDONLY | O_NOFOLLOW)) != -1) {
+	cp = buf;
+	while ((nread = read(fd, cp, buf + sizeof(buf) - cp)) != 0) {
+	    if (nread == -1) {
+		if (errno == EAGAIN || errno == EINTR)
+		    continue;
+		break;
+	    }
+	    cp += nread;
+	    if (cp >= buf + sizeof(buf))
+		break;
+	}
+	if (nread == 0 && memchr(buf, '\0', cp - buf) == NULL) {
+	    /*
+	     * Field 7 is the tty dev (0 if no tty).
+	     * Since the process name at field 2 "(comm)" may include
+	     * whitespace (including newlines), start at the last ')' found.
+	     */
+	    *cp = '\0';
+	    cp = strrchr(buf, ')');
+	    if (cp != NULL) {
+		char *ep = cp;
+		const char *errstr;
+		int field = 1;
+
+		while (*++ep != '\0') {
+		    if (*ep == ' ') {
+			*ep = '\0';
+			if (++field == 7) {
+			    int tty_nr = sudo_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 (tty_nr != 0) {
+				/*
+				 * Avoid sign extension when assigning tdev.
+				 * tty_nr in /proc/self/stat is printed as a
+				 * signed int but the actual device number is an
+				 * unsigned int and dev_t is unsigned long long.
+				 */
+				dev_t tdev = (unsigned int)tty_nr;
+				errno = serrno;
+				ret = sudo_ttyname_dev(tdev, name, namelen);
+				goto done;
+			    }
+			    break;
+			}
+			cp = ep + 1;
+		    }
+		}
+	    }
+	}
+    }
+    errno = ENOENT;
+
+done:
+    if (fd != -1)
+	close(fd);
+    if (ret == NULL)
+	sudo_debug_printf(SUDO_DEBUG_WARN|SUDO_DEBUG_LINENO|SUDO_DEBUG_ERRNO,
+	    "unable to resolve tty via %s", path);
+
+    debug_return_str(ret);
+}
+#elif defined(HAVE_PSTAT_GETPROC)
+/*
+ * Store the name of the tty to which the process is attached in name.
+ * Returns name on success and NULL on failure, setting errno.
+ */
+char *
+get_process_ttyname(char *name, size_t namelen)
+{
+    struct pst_status pst;
+    char *ret = NULL;
+    int rc, serrno = errno;
+    debug_decl(get_process_ttyname, SUDO_DEBUG_UTIL);
+
+    /*
+     * Determine the tty from psdev in struct pst_status.
+     * EOVERFLOW is not a fatal error for the fields we use.
+     * See the "EOVERFLOW Error" section of pstat_getvminfo(3).
+     */
+    rc = pstat_getproc(&pst, sizeof(pst), 0, getpid());
+    if (rc != -1 || errno == EOVERFLOW) {
+	if (pst.pst_term.psd_major != -1 && pst.pst_term.psd_minor != -1) {
+	    errno = serrno;
+	    ret = sudo_ttyname_dev(makedev(pst.pst_term.psd_major,
+		pst.pst_term.psd_minor), name, namelen);
+	    goto done;
+	}
+    }
+    errno = ENOENT;
+
+done:
+    if (ret == NULL)
+	sudo_debug_printf(SUDO_DEBUG_WARN|SUDO_DEBUG_LINENO|SUDO_DEBUG_ERRNO,
+	    "unable to resolve tty via pstat");
+
+    debug_return_str(ret);
+}
+#else
+/*
+ * Store the name of the tty to which the process is attached in name.
+ * Returns name on success and NULL on failure, setting errno.
+ */
+char *
+get_process_ttyname(char *name, size_t namelen)
+{
+    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);
+    }
+    if (tty != NULL) {
+	if (strlcpy(name, tty, namelen) < namelen)
+	    debug_return_str(name);
+	errno = ERANGE;
+	sudo_debug_printf(SUDO_DEBUG_WARN|SUDO_DEBUG_LINENO|SUDO_DEBUG_ERRNO,
+	    "unable to store tty from ttyname");
+    } else {
+	sudo_debug_printf(SUDO_DEBUG_WARN|SUDO_DEBUG_LINENO|SUDO_DEBUG_ERRNO,
+	    "unable to resolve tty via ttyname");
+	errno = ENOENT;
+    }
+
+    debug_return_str(NULL);
+}
+#endif