X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Futil.c;h=f75df7b5116c68662decce5ac1f27a6a0897f0c6;hb=6f7f51f793e5f2a5d42e05e3f1e3101f49d37299;hp=278f0184de9f86ed9bce726d6ee201dfe7431202;hpb=4d6d6518c301c844be59c1b3a0d2092a3218572f;p=elogind.git

diff --git a/src/util.c b/src/util.c
index 278f0184d..f75df7b51 100644
--- a/src/util.c
+++ b/src/util.c
@@ -64,6 +64,9 @@
 #include "exit-status.h"
 #include "hashmap.h"
 
+int saved_argc = 0;
+char **saved_argv = NULL;
+
 size_t page_size(void) {
         static __thread size_t pgsz = 0;
         long r;
@@ -3026,6 +3029,20 @@ void rename_process(const char name[8]) {
 
         if (program_invocation_name)
                 strncpy(program_invocation_name, name, strlen(program_invocation_name));
+
+        if (saved_argc > 0) {
+                int i;
+
+                if (saved_argv[0])
+                        strncpy(saved_argv[0], name, strlen(saved_argv[0]));
+
+                for (i = 1; i < saved_argc; i++) {
+                        if (!saved_argv[i])
+                                break;
+
+                        memset(saved_argv[i], 0, strlen(saved_argv[i]));
+                }
+        }
 }
 
 void sigset_add_many(sigset_t *ss, ...) {
@@ -4674,7 +4691,11 @@ int vt_disallocate(const char *name) {
                 if (fd < 0)
                         return fd;
 
-                loop_write(fd, "\033[H\033[2J", 7, false); /* clear screen */
+                loop_write(fd,
+                           "\033[r"    /* clear scrolling region */
+                           "\033[H"    /* move home */
+                           "\033[2J",  /* clear screen */
+                           10, false);
                 close_nointr_nofail(fd);
 
                 return 0;
@@ -4710,8 +4731,11 @@ int vt_disallocate(const char *name) {
         if (fd < 0)
                 return fd;
 
-        /* Requires Linux 2.6.40 */
-        loop_write(fd, "\033[H\033[3J", 7, false); /* clear screen including scrollback */
+        loop_write(fd,
+                   "\033[r"   /* clear scrolling region */
+                   "\033[H"   /* move home */
+                   "\033[3J", /* clear screen including scrollback, requires Linux 2.6.40 */
+                   10, false);
         close_nointr_nofail(fd);
 
         return 0;
@@ -5164,6 +5188,52 @@ int socket_from_display(const char *display, char **path) {
         return 0;
 }
 
+int get_user_creds(const char **username, uid_t *uid, gid_t *gid, const char **home) {
+        struct passwd *p;
+        unsigned long lu;
+
+        assert(username);
+        assert(*username);
+        assert(uid);
+        assert(gid);
+        assert(home);
+
+        /* We enforce some special rules for uid=0: in order to avoid
+         * NSS lookups for root we hardcode its data. */
+
+        if (streq(*username, "root") || streq(*username, "0")) {
+                *username = "root";
+                *uid = 0;
+                *gid = 0;
+                *home = "/root";
+                return 0;
+        }
+
+        if (safe_atolu(*username, &lu) >= 0) {
+                errno = 0;
+                p = getpwuid((uid_t) lu);
+
+                /* If there are multiple users with the same id, make
+                 * sure to leave $USER to the configured value instead
+                 * of the first occurrence in the database. However if
+                 * the uid was configured by a numeric uid, then let's
+                 * pick the real username from /etc/passwd. */
+                if (p)
+                        *username = p->pw_name;
+        } else {
+                errno = 0;
+                p = getpwnam(*username);
+        }
+
+        if (!p)
+                return errno != 0 ? -errno : -ESRCH;
+
+        *uid = p->pw_uid;
+        *gid = p->pw_gid;
+        *home = p->pw_dir;
+        return 0;
+}
+
 static const char *const ioprio_class_table[] = {
         [IOPRIO_CLASS_NONE] = "none",
         [IOPRIO_CLASS_RT] = "realtime",