checking in all the old panacean stuff

puttysrc/UNIX/UXSTORE.C

@@ -0,0 +1,582 @@
+/*
+ * uxstore.c: Unix-specific implementation of the interface defined
+ * in storage.h.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#include <errno.h>
+#include <ctype.h>
+#include <limits.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"
+
+#ifdef PATH_MAX
+#define FNLEN PATH_MAX
+#else
+#define FNLEN 1024 /* XXX */
+#endif
+
+enum {
+    INDEX_DIR, INDEX_HOSTKEYS, INDEX_HOSTKEYS_TMP, INDEX_RANDSEED,
+    INDEX_SESSIONDIR, INDEX_SESSION,
+};
+
+static const char hex[16] = "0123456789ABCDEF";
+
+static char *mungestr(const char *in)
+{
+    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, FNLEN);
+    len = strlen(filename);
+    if (index == INDEX_SESSION) {
+        char *munged = mungestr(subname);
+        char *fn = dupprintf("/.putty/sessions/%s", munged);
+        strncpy(filename + len, fn, FNLEN - 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", FNLEN - len);
+    }
+    filename[FNLEN-1] = '\0';
+}
+
+void *open_settings_w(const char *sessionname, char **errmsg)
+{
+    char filename[FNLEN];
+    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);
+}
+
+/*
+ * Reading settings, for the moment, is done by retrieving X
+ * resources from the X display. When we introduce disk files, I
+ * think what will happen is that the X resources will override
+ * 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 keyval {
+    const char *key;
+    const char *value;
+};
+
+static tree234 *xrmtree = NULL;
+
+int keycmp(void *av, void *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 keyval *xrms, *ret;
+
+    p = q = strchr(string, ':');
+    if (!q) {
+	fprintf(stderr, "pterm: expected a colon in resource string"
+		" \"%s\"\n", string);
+	return;
+    }
+    q++;
+    while (p > string && p[-1] != '.' && p[-1] != '*')
+	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((unsigned char)*q))
+	q++;
+    xrms->value = dupstr(q);
+
+    if (!xrmtree)
+	xrmtree = newtree234(keycmp);
+
+    ret = add234(xrmtree, xrms);
+    if (ret) {
+	/* Override an existing string. */
+	del234(xrmtree, ret);
+	add234(xrmtree, xrms);
+    }
+}
+
+const char *get_setting(const char *key)
+{
+    struct keyval tmp, *ret;
+    tmp.key = key;
+    if (xrmtree) {
+	ret = find234(xrmtree, &tmp, NULL);
+	if (ret)
+	    return ret->value;
+    }
+    return x_get_default(key);
+}
+
+void *open_settings_r(const char *sessionname)
+{
+    char filename[FNLEN];
+    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)
+{
+    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 {
+	strncpy(buffer, val, buflen);
+	buffer[buflen-1] = '\0';
+	return buffer;
+    }
+}
+
+int read_setting_i(void *handle, const char *key, int defvalue)
+{
+    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
+	return atoi(val);
+}
+
+int read_setting_fontspec(void *handle, const char *name, FontSpec *result)
+{
+    return !!read_setting_s(handle, name, result->name, sizeof(result->name));
+}
+int read_setting_filename(void *handle, const char *name, Filename *result)
+{
+    return !!read_setting_s(handle, name, result->path, sizeof(result->path));
+}
+
+void write_setting_fontspec(void *handle, const char *name, FontSpec result)
+{
+    write_setting_s(handle, name, result.name);
+}
+void write_setting_filename(void *handle, const char *name, Filename result)
+{
+    write_setting_s(handle, name, result.path);
+}
+
+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[FNLEN];
+    make_filename(filename, INDEX_SESSION, sessionname);
+    unlink(filename);
+}
+
+void *enum_settings_start(void)
+{
+    DIR *dp;
+    char filename[FNLEN];
+
+    make_filename(filename, INDEX_SESSIONDIR, NULL);
+    dp = opendir(filename);
+
+    return dp;
+}
+
+char *enum_settings_next(void *handle, char *buffer, int buflen)
+{
+    DIR *dp = (DIR *)handle;
+    struct dirent *de;
+    struct stat st;
+    char fullpath[FNLEN];
+    int len;
+    char *unmunged;
+
+    make_filename(fullpath, INDEX_SESSIONDIR, NULL);
+    len = strlen(fullpath);
+
+    while ( (de = readdir(dp)) != NULL ) {
+        if (len < FNLEN) {
+            fullpath[len] = '/';
+            strncpy(fullpath+len+1, de->d_name, FNLEN-(len+1));
+            fullpath[FNLEN-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;
+}
+
+void enum_settings_finish(void *handle)
+{
+    DIR *dp = (DIR *)handle;
+    closedir(dp);
+}
+
+/*
+ * Lines in the host keys file are of the form
+ * 
+ *   type@port:hostname keydata
+ * 
+ * e.g.
+ * 
+ *   rsa@22:foovax.example.org 0x23,0x293487364395345345....2343
+ */
+int verify_host_key(const char *hostname, int port,
+		    const char *keytype, const char *key)
+{
+    FILE *fp;
+    char filename[FNLEN];
+    char *line;
+    int ret;
+
+    make_filename(filename, INDEX_HOSTKEYS, NULL);
+    fp = fopen(filename, "r");
+    if (!fp)
+	return 1;		       /* key does not exist */
+
+    ret = 1;
+    while ( (line = fgetline(fp)) ) {
+	int i;
+	char *p = line;
+	char porttext[20];
+
+	line[strcspn(line, "\n")] = '\0';   /* strip trailing newline */
+
+	i = strlen(keytype);
+	if (strncmp(p, keytype, i))
+	    goto done;
+	p += i;
+
+	if (*p != '@')
+	    goto done;
+	p++;
+
+	sprintf(porttext, "%d", port);
+	i = strlen(porttext);
+	if (strncmp(p, porttext, i))
+	    goto done;
+	p += i;
+
+	if (*p != ':')
+	    goto done;
+	p++;
+
+	i = strlen(hostname);
+	if (strncmp(p, hostname, i))
+	    goto done;
+	p += i;
+
+	if (*p != ' ')
+	    goto done;
+	p++;
+
+	/*
+	 * Found the key. Now just work out whether it's the right
+	 * one or not.
+	 */
+	if (!strcmp(p, key))
+	    ret = 0;		       /* key matched OK */
+	else
+	    ret = 2;		       /* key mismatch */
+
+	done:
+	sfree(line);
+	if (ret != 1)
+	    break;
+    }
+
+    fclose(fp);
+    return ret;
+}
+
+void store_host_key(const char *hostname, int port,
+		    const char *keytype, const char *key)
+{
+    FILE *rfp, *wfp;
+    char *newtext, *line;
+    int headerlen;
+    char filename[FNLEN], tmpfilename[FNLEN];
+
+    newtext = dupprintf("%s@%d:%s %s\n", keytype, port, hostname, key);
+    headerlen = 1 + strcspn(newtext, " ");   /* count the space too */
+
+    /*
+     * Open both the old file and a new file.
+     */
+    make_filename(tmpfilename, INDEX_HOSTKEYS_TMP, NULL);
+    wfp = fopen(tmpfilename, "w");
+    if (!wfp) {
+        char dir[FNLEN];
+
+        make_filename(dir, INDEX_DIR, NULL);
+        mkdir(dir, 0700);
+        wfp = fopen(tmpfilename, "w");
+    }
+    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);
+    }
+
+    /*
+     * 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)
+{
+    int fd;
+    char fname[FNLEN];
+
+    make_filename(fname, INDEX_RANDSEED, NULL);
+    fd = open(fname, O_RDONLY);
+    if (fd) {
+	char buf[512];
+	int ret;
+	while ( (ret = read(fd, buf, sizeof(buf))) > 0)
+	    consumer(buf, ret);
+	close(fd);
+    }
+}
+
+void write_random_seed(void *data, int len)
+{
+    int fd;
+    char fname[FNLEN];
+
+    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
+     * be better to leave the old data there than to leave it empty.
+     */
+    fd = open(fname, O_CREAT | O_WRONLY, 0600);
+    if (fd < 0) {
+	char dir[FNLEN];
+
+	make_filename(dir, INDEX_DIR, NULL);
+	mkdir(dir, 0700);
+	fd = open(fname, O_CREAT | O_WRONLY, 0600);
+    }
+
+    while (len > 0) {
+	int ret = write(fd, data, len);
+	if (ret <= 0) break;
+	len -= ret;
+	data = (char *)data + len;
+    }
+
+    close(fd);
+}
+
+void cleanup_all(void)
+{
+}