1 files changed, 127 insertions, 1 deletions

diff --git a/misc.c b/misc.c
index 7adbcea1c..2dd8ae6e3 100644
--- a/misc.c
+++ b/misc.c
@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2000 Markus Friedl.  All rights reserved.
+ * Copyright (c) 2005 Damien Miller.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -23,7 +24,7 @@
  */
 
 #include "includes.h"
-RCSID("$OpenBSD: misc.c,v 1.29 2005/03/10 22:01:05 deraadt Exp $");
+RCSID("$OpenBSD: misc.c,v 1.34 2005/07/08 09:26:18 dtucker Exp $");
 
 #include "misc.h"
 #include "log.h"
@@ -376,6 +377,114 @@ addargs(arglist *args, char *fmt, ...)
 }
 
 /*
+ * Expands tildes in the file name.  Returns data allocated by xmalloc.
+ * Warning: this calls getpw*.
+ */
+char *
+tilde_expand_filename(const char *filename, uid_t uid)
+{
+        const char *path;
+        char user[128], ret[MAXPATHLEN];
+        struct passwd *pw;
+        u_int len, slash;
+
+        if (*filename != '~')
+                return (xstrdup(filename));
+        filename++;
+
+        path = strchr(filename, '/');
+        if (path != NULL && path > filename) {          /* ~user/path */
+                slash = path - filename;
+                if (slash > sizeof(user) - 1)
+                        fatal("tilde_expand_filename: ~username too long");
+                memcpy(user, filename, slash);
+                user[slash] = '\0';
+                if ((pw = getpwnam(user)) == NULL)
+                        fatal("tilde_expand_filename: No such user %s", user);
+        } else if ((pw = getpwuid(uid)) == NULL)        /* ~/path */
+                fatal("tilde_expand_filename: No such uid %d", uid);
+
+        if (strlcpy(ret, pw->pw_dir, sizeof(ret)) >= sizeof(ret))
+                fatal("tilde_expand_filename: Path too long");
+
+        /* Make sure directory has a trailing '/' */
+        len = strlen(pw->pw_dir);
+        if ((len == 0 || pw->pw_dir[len - 1] != '/') &&
+            strlcat(ret, "/", sizeof(ret)) >= sizeof(ret))
+                fatal("tilde_expand_filename: Path too long");
+
+        /* Skip leading '/' from specified path */
+        if (path != NULL)
+                filename = path + 1;
+        if (strlcat(ret, filename, sizeof(ret)) >= sizeof(ret))
+                fatal("tilde_expand_filename: Path too long");
+
+        return (xstrdup(ret));
+}
+
+/*
+ * Expand a string with a set of %[char] escapes. A number of escapes may be
+ * specified as (char *escape_chars, char *replacement) pairs. The list must
+ * be terminated by a NULL escape_char. Returns replaced string in memory
+ * allocated by xmalloc.
+ */
+char *
+percent_expand(const char *string, ...)
+{
+#define EXPAND_MAX_KEYS 16
+        struct {
+                const char *key;
+                const char *repl;
+        } keys[EXPAND_MAX_KEYS];
+        u_int num_keys, i, j;
+        char buf[4096];
+        va_list ap;
+
+        /* Gather keys */
+        va_start(ap, string);
+        for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) {
+                keys[num_keys].key = va_arg(ap, char *);
+                if (keys[num_keys].key == NULL)
+                        break;
+                keys[num_keys].repl = va_arg(ap, char *);
+                if (keys[num_keys].repl == NULL)
+                        fatal("percent_expand: NULL replacement");
+        }
+        va_end(ap);
+
+        if (num_keys >= EXPAND_MAX_KEYS)
+                fatal("percent_expand: too many keys");
+
+        /* Expand string */
+        *buf = '\0';
+        for (i = 0; *string != '\0'; string++) {
+                if (*string != '%') {
+ append:
+                        buf[i++] = *string;
+                        if (i >= sizeof(buf))
+                                fatal("percent_expand: string too long");
+                        buf[i] = '\0';
+                        continue;
+                }
+                string++;
+                if (*string == '%')
+                        goto append;
+                for (j = 0; j < num_keys; j++) {
+                        if (strchr(keys[j].key, *string) != NULL) {
+                                i = strlcat(buf, keys[j].repl, sizeof(buf));
+                                if (i >= sizeof(buf))
+                                        fatal("percent_expand: string too long");
+                                break;
+                        }
+                }
+                if (j >= num_keys)
+                        fatal("percent_expand: unknown key %%%c", *string);
+        }
+        return (xstrdup(buf));
+#undef EXPAND_MAX_KEYS
+}
+
+/*
  * Read an entire line from a public key file into a static buffer, discarding
  * lines that exceed the buffer size.  Returns 0 on success, -1 on failure.
  */
@@ -397,3 +506,20 @@ read_keyfile_line(FILE *f, const char *filename, char *buf, size_t bufsz,
         }
         return -1;
 }
+
+char *
+tohex(const u_char *d, u_int l)
+{
+        char b[3], *r;
+        u_int i, hl;
+
+        hl = l * 2 + 1;
+        r = xmalloc(hl);
+        *r = '\0';
+        for (i = 0; i < l; i++) {
+                snprintf(b, sizeof(b), "%02x", d[i]);
+                strlcat(r, b, hl);
+        }
+        return (r);
+}
+