X-Git-Url: https://git.distorted.org.uk/~mdw/sgt/putty/blobdiff_plain/9a30e26b7801d63e4ccfe8d36169299c09b89dff..bbaa7993383b7e7e664e8388e4545c9035f69295:/unix/uxstore.c

diff --git a/unix/uxstore.c b/unix/uxstore.c
index 6035113b..85d72ca7 100644
--- a/unix/uxstore.c
+++ b/unix/uxstore.c
@@ -5,37 +5,153 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#include <errno.h>
 #include <ctype.h>
 #include <unistd.h>
 #include <fcntl.h>
+#include <dirent.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include "putty.h"
 #include "storage.h"
 #include "tree234.h"
 
-/*
- * For the moment, the only existing Unix utility is pterm and that
- * has no GUI configuration at all, so our write routines need do
- * nothing. Eventually I suppose these will read and write an rc
- * file somewhere or other.
- */
+enum {
+    INDEX_DIR, INDEX_HOSTKEYS, INDEX_HOSTKEYS_TMP, INDEX_RANDSEED,
+    INDEX_SESSIONDIR, INDEX_SESSION,
+};
 
-void *open_settings_w(const char *sessionname)
+static const char hex[16] = "0123456789ABCDEF";
+
+static char *mungestr(const char *in)
 {
-    return NULL;
+    char *out, *ret;
+
+    if (!in || !*in)
+        in = "Default Settings";
+
+    ret = out = snewn(3*strlen(in)+1, char);
+
+    while (*in) {
+        /*
+         * There are remarkably few punctuation characters that
+         * aren't shell-special in some way or likely to be used as
+         * separators in some file format or another! Hence we use
+         * opt-in for safe characters rather than opt-out for
+         * specific unsafe ones...
+         */
+	if (*in!='+' && *in!='-' && *in!='.' && *in!='@' && *in!='_' &&
+            !(*in >= '0' && *in <= '9') &&
+            !(*in >= 'A' && *in <= 'Z') &&
+            !(*in >= 'a' && *in <= 'z')) {
+	    *out++ = '%';
+	    *out++ = hex[((unsigned char) *in) >> 4];
+	    *out++ = hex[((unsigned char) *in) & 15];
+	} else
+	    *out++ = *in;
+	in++;
+    }
+    *out = '\0';
+    return ret;
+}
+
+static char *unmungestr(const char *in)
+{
+    char *out, *ret;
+    out = ret = snewn(strlen(in)+1, char);
+    while (*in) {
+	if (*in == '%' && in[1] && in[2]) {
+	    int i, j;
+
+	    i = in[1] - '0';
+	    i -= (i > 9 ? 7 : 0);
+	    j = in[2] - '0';
+	    j -= (j > 9 ? 7 : 0);
+
+	    *out++ = (i << 4) + j;
+	    in += 3;
+	} else {
+	    *out++ = *in++;
+	}
+    }
+    *out = '\0';
+    return ret;
+}
+
+static void make_filename(char *filename, int index, const char *subname)
+{
+    char *home;
+    int len;
+    home = getenv("HOME");
+    if (!home)
+        home="/";
+    strncpy(filename, home, FILENAME_MAX);
+    len = strlen(filename);
+    if (index == INDEX_SESSION) {
+        char *munged = mungestr(subname);
+        char *fn = dupprintf("/.putty/sessions/%s", munged);
+        strncpy(filename + len, fn, FILENAME_MAX - len);
+        sfree(fn);
+        sfree(munged);
+    } else {
+        strncpy(filename + len,
+                index == INDEX_DIR ? "/.putty" :
+                index == INDEX_SESSIONDIR ? "/.putty/sessions" :
+                index == INDEX_HOSTKEYS ? "/.putty/sshhostkeys" :
+                index == INDEX_HOSTKEYS_TMP ? "/.putty/sshhostkeys.tmp" :
+                index == INDEX_RANDSEED ? "/.putty/randomseed" :
+                "/.putty/ERROR", FILENAME_MAX - len);
+    }
+    filename[FILENAME_MAX-1] = '\0';
+}
+
+void *open_settings_w(const char *sessionname, char **errmsg)
+{
+    char filename[FILENAME_MAX];
+    FILE *fp;
+
+    *errmsg = NULL;
+
+    /*
+     * Start by making sure the .putty directory and its sessions
+     * subdir actually exist. Ignore error returns from mkdir since
+     * they're perfectly likely to be `already exists', and any
+     * other error will trip us up later on so there's no real need
+     * to catch it now.
+     */
+    make_filename(filename, INDEX_DIR, sessionname);
+    mkdir(filename, 0700);
+    make_filename(filename, INDEX_SESSIONDIR, sessionname);
+    mkdir(filename, 0700);
+
+    make_filename(filename, INDEX_SESSION, sessionname);
+    fp = fopen(filename, "w");
+    if (!fp) {
+        *errmsg = dupprintf("Unable to create %s: %s",
+                            filename, strerror(errno));
+	return NULL;                   /* can't open */
+    }
+    return fp;
 }
 
 void write_setting_s(void *handle, const char *key, const char *value)
 {
+    FILE *fp = (FILE *)handle;
+    fprintf(fp, "%s=%s\n", key, value);
 }
 
 void write_setting_i(void *handle, const char *key, int value)
 {
+    FILE *fp = (FILE *)handle;
+    fprintf(fp, "%s=%d\n", key, value);
 }
 
 void close_settings_w(void *handle)
 {
+    FILE *fp = (FILE *)handle;
+    fclose(fp);
 }
 
 /*
@@ -45,26 +161,27 @@ void close_settings_w(void *handle)
  * PuTTY's inbuilt defaults, but that the disk files will then
  * override those. This isn't optimal, but it's the best I can
  * immediately work out.
+ * FIXME: the above comment is a bit out of date. Did it happen?
  */
 
-struct xrm_string {
+struct keyval {
     const char *key;
     const char *value;
 };
 
 static tree234 *xrmtree = NULL;
 
-int xrmcmp(void *av, void *bv)
+int keycmp(void *av, void *bv)
 {
-    struct xrm_string *a = (struct xrm_string *)av;
-    struct xrm_string *b = (struct xrm_string *)bv;
+    struct keyval *a = (struct keyval *)av;
+    struct keyval *b = (struct keyval *)bv;
     return strcmp(a->key, b->key);
 }
 
 void provide_xrm_string(char *string)
 {
     char *p, *q, *key;
-    struct xrm_string *xrms, *ret;
+    struct keyval *xrms, *ret;
 
     p = q = strchr(string, ':');
     if (!q) {
@@ -75,17 +192,17 @@ void provide_xrm_string(char *string)
     q++;
     while (p > string && p[-1] != '.' && p[-1] != '*')
 	p--;
-    xrms = smalloc(sizeof(struct xrm_string));
-    key = smalloc(q-p);
+    xrms = snew(struct keyval);
+    key = snewn(q-p, char);
     memcpy(key, p, q-p);
     key[q-p-1] = '\0';
     xrms->key = key;
-    while (*q && isspace(*q))
+    while (*q && isspace((unsigned char)*q))
 	q++;
     xrms->value = dupstr(q);
 
     if (!xrmtree)
-	xrmtree = newtree234(xrmcmp);
+	xrmtree = newtree234(keycmp);
 
     ret = add234(xrmtree, xrms);
     if (ret) {
@@ -97,7 +214,7 @@ void provide_xrm_string(char *string)
 
 const char *get_setting(const char *key)
 {
-    struct xrm_string tmp, *ret;
+    struct keyval tmp, *ret;
     tmp.key = key;
     if (xrmtree) {
 	ret = find234(xrmtree, &tmp, NULL);
@@ -109,13 +226,54 @@ const char *get_setting(const char *key)
 
 void *open_settings_r(const char *sessionname)
 {
-    static int thing_to_return_an_arbitrary_non_null_pointer_to;
-    return &thing_to_return_an_arbitrary_non_null_pointer_to;
+    char filename[FILENAME_MAX];
+    FILE *fp;
+    char *line;
+    tree234 *ret;
+
+    make_filename(filename, INDEX_SESSION, sessionname);
+    fp = fopen(filename, "r");
+    if (!fp)
+	return NULL;		       /* can't open */
+
+    ret = newtree234(keycmp);
+
+    while ( (line = fgetline(fp)) ) {
+        char *value = strchr(line, '=');
+        struct keyval *kv;
+
+        if (!value)
+            continue;
+        *value++ = '\0';
+        value[strcspn(value, "\r\n")] = '\0';   /* trim trailing NL */
+
+        kv = snew(struct keyval);
+        kv->key = dupstr(line);
+        kv->value = dupstr(value);
+        add234(ret, kv);
+
+        sfree(line);
+    }
+
+    fclose(fp);
+
+    return ret;
 }
 
 char *read_setting_s(void *handle, const char *key, char *buffer, int buflen)
 {
-    const char *val = get_setting(key);
+    tree234 *tree = (tree234 *)handle;
+    const char *val;
+    struct keyval tmp, *kv;
+
+    tmp.key = key;
+    if (tree != NULL &&
+        (kv = find234(tree, &tmp, NULL)) != NULL) {
+        val = kv->value;
+        assert(val != NULL);
+    } else
+        val = get_setting(key);
+
     if (!val)
 	return NULL;
     else {
@@ -127,7 +285,18 @@ char *read_setting_s(void *handle, const char *key, char *buffer, int buflen)
 
 int read_setting_i(void *handle, const char *key, int defvalue)
 {
-    const char *val = get_setting(key);
+    tree234 *tree = (tree234 *)handle;
+    const char *val;
+    struct keyval tmp, *kv;
+
+    tmp.key = key;
+    if (tree != NULL &&
+        (kv = find234(tree, &tmp, NULL)) != NULL) {
+        val = kv->value;
+        assert(val != NULL);
+    } else
+        val = get_setting(key);
+
     if (!val)
 	return defvalue;
     else
@@ -154,66 +323,76 @@ void write_setting_filename(void *handle, const char *name, Filename result)
 
 void close_settings_r(void *handle)
 {
+    tree234 *tree = (tree234 *)handle;
+    struct keyval *kv;
+
+    if (!tree)
+        return;
+
+    while ( (kv = index234(tree, 0)) != NULL) {
+        del234(tree, kv);
+        sfree((char *)kv->key);
+        sfree((char *)kv->value);
+        sfree(kv);
+    }
+
+    freetree234(tree);
 }
 
 void del_settings(const char *sessionname)
 {
+    char filename[FILENAME_MAX];
+    make_filename(filename, INDEX_SESSION, sessionname);
+    unlink(filename);
 }
 
 void *enum_settings_start(void)
 {
-    return NULL;
-}
+    DIR *dp;
+    char filename[FILENAME_MAX];
 
-char *enum_settings_next(void *handle, char *buffer, int buflen)
-{
-    return NULL;
-}
+    make_filename(filename, INDEX_SESSIONDIR, NULL);
+    dp = opendir(filename);
 
-void enum_settings_finish(void *handle)
-{
+    return dp;
 }
 
-enum {
-    INDEX_DIR, INDEX_HOSTKEYS, INDEX_RANDSEED
-};
-
-static void make_filename(char *filename, int index)
+char *enum_settings_next(void *handle, char *buffer, int buflen)
 {
-    char *home;
+    DIR *dp = (DIR *)handle;
+    struct dirent *de;
+    struct stat st;
+    char fullpath[FILENAME_MAX];
     int len;
-    home = getenv("HOME");
-    strncpy(filename, home, FILENAME_MAX);
-    len = strlen(filename);
-    strncpy(filename + len,
-	    index == INDEX_DIR ? "/.putty" :
-	    index == INDEX_HOSTKEYS ? "/.putty/sshhostkeys" :
-	    index == INDEX_RANDSEED ? "/.putty/randomseed" :
-	    "/.putty/ERROR", FILENAME_MAX - len);
-    filename[FILENAME_MAX-1] = '\0';
+    char *unmunged;
+
+    make_filename(fullpath, INDEX_SESSIONDIR, NULL);
+    len = strlen(fullpath);
+
+    while ( (de = readdir(dp)) != NULL ) {
+        if (len < FILENAME_MAX) {
+            fullpath[len] = '/';
+            strncpy(fullpath+len+1, de->d_name, FILENAME_MAX-(len+1));
+            fullpath[FILENAME_MAX-1] = '\0';
+        }
+
+        if (stat(fullpath, &st) < 0 || !S_ISREG(st.st_mode))
+            continue;                  /* try another one */
+
+        unmunged = unmungestr(de->d_name);
+        strncpy(buffer, unmunged, buflen);
+        buffer[buflen-1] = '\0';
+        sfree(unmunged);
+        return buffer;
+    }
+
+    return NULL;
 }
 
-/*
- * Read an entire line of text from a file. Return a buffer
- * malloced to be as big as necessary (caller must free).
- */
-static char *fgetline(FILE *fp)
+void enum_settings_finish(void *handle)
 {
-    char *ret = smalloc(512);
-    int size = 512, len = 0;
-    while (fgets(ret + len, size - len, fp)) {
-	len += strlen(ret + len);
-	if (ret[len-1] == '\n')
-	    break;		       /* got a newline, we're done */
-	size = len + 512;
-	ret = srealloc(ret, size);
-    }
-    if (len == 0) {		       /* first fgets returned NULL */
-	sfree(ret);
-	return NULL;
-    }
-    ret[len] = '\0';
-    return ret;
+    DIR *dp = (DIR *)handle;
+    closedir(dp);
 }
 
 /*
@@ -233,7 +412,7 @@ int verify_host_key(const char *hostname, int port,
     char *line;
     int ret;
 
-    make_filename(filename, INDEX_HOSTKEYS);
+    make_filename(filename, INDEX_HOSTKEYS, NULL);
     fp = fopen(filename, "r");
     if (!fp)
 	return 1;		       /* key does not exist */
@@ -289,32 +468,60 @@ int verify_host_key(const char *hostname, int port,
 	    break;
     }
 
+    fclose(fp);
     return ret;
 }
 
 void store_host_key(const char *hostname, int port,
 		    const char *keytype, const char *key)
 {
-    FILE *fp;
-    int fd;
-    char filename[FILENAME_MAX];
+    FILE *rfp, *wfp;
+    char *newtext, *line;
+    int headerlen;
+    char filename[FILENAME_MAX], tmpfilename[FILENAME_MAX];
 
-    make_filename(filename, INDEX_HOSTKEYS);
-    fd = open(filename, O_CREAT | O_APPEND | O_RDWR, 0600);
-    if (fd < 0) {
-	char dir[FILENAME_MAX];
+    newtext = dupprintf("%s@%d:%s %s\n", keytype, port, hostname, key);
+    headerlen = 1 + strcspn(newtext, " ");   /* count the space too */
 
-	make_filename(dir, INDEX_DIR);
-	mkdir(dir, 0700);
-	fd = open(filename, O_CREAT | O_APPEND | O_RDWR, 0600);
+    /*
+     * Open both the old file and a new file.
+     */
+    make_filename(tmpfilename, INDEX_HOSTKEYS_TMP, NULL);
+    wfp = fopen(tmpfilename, "w");
+    if (!wfp) {
+        char dir[FILENAME_MAX];
+
+        make_filename(dir, INDEX_DIR, NULL);
+        mkdir(dir, 0700);
+        wfp = fopen(tmpfilename, "w");
     }
-    if (fd < 0) {
-	perror(filename);
-	exit(1);
+    if (!wfp)
+	return;
+    make_filename(filename, INDEX_HOSTKEYS, NULL);
+    rfp = fopen(filename, "r");
+
+    /*
+     * Copy all lines from the old file to the new one that _don't_
+     * involve the same host key identifier as the one we're adding.
+     */
+    if (rfp) {
+        while ( (line = fgetline(rfp)) ) {
+            if (strncmp(line, newtext, headerlen))
+                fputs(line, wfp);
+        }
+        fclose(rfp);
     }
-    fp = fdopen(fd, "a");
-    fprintf(fp, "%s@%d:%s %s\n", keytype, port, hostname, key);
-    fclose(fp);
+
+    /*
+     * Now add the new line at the end.
+     */
+    fputs(newtext, wfp);
+
+    fclose(wfp);
+
+    rename(tmpfilename, filename);
+
+    sfree(newtext);
 }
 
 void read_random_seed(noise_consumer_t consumer)
@@ -322,7 +529,7 @@ void read_random_seed(noise_consumer_t consumer)
     int fd;
     char fname[FILENAME_MAX];
 
-    make_filename(fname, INDEX_RANDSEED);
+    make_filename(fname, INDEX_RANDSEED, NULL);
     fd = open(fname, O_RDONLY);
     if (fd) {
 	char buf[512];
@@ -338,7 +545,7 @@ void write_random_seed(void *data, int len)
     int fd;
     char fname[FILENAME_MAX];
 
-    make_filename(fname, INDEX_RANDSEED);
+    make_filename(fname, INDEX_RANDSEED, NULL);
     /*
      * Don't truncate the random seed file if it already exists; if
      * something goes wrong half way through writing it, it would
@@ -348,7 +555,7 @@ void write_random_seed(void *data, int len)
     if (fd < 0) {
 	char dir[FILENAME_MAX];
 
-	make_filename(dir, INDEX_DIR);
+	make_filename(dir, INDEX_DIR, NULL);
 	mkdir(dir, 0700);
 	fd = open(fname, O_CREAT | O_WRONLY, 0600);
     }