Moved expand_homedir_template() from NSS responder to utility code

2 files changed, 167 insertions, 0 deletions

diff --git a/src/util/sss_nss.c b/src/util/sss_nss.c
new file mode 100644
index 00000000..ceccda38
--- /dev/null
+++ b/src/util/sss_nss.c
@@ -0,0 +1,136 @@
+/*
+   SSSD
+
+   Utility functions related to ID information
+
+   Copyright (C) Jan Zeleny <jzeleny@redhat.com> 2012
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "util/util.h"
+#include "util/sss_nss.h"
+
+char *expand_homedir_template(TALLOC_CTX *mem_ctx, const char *template,
+                              const char *username, uint32_t uid,
+                              const char *domain)
+{
+    char *copy;
+    char *p;
+    char *n;
+    char *result = NULL;
+    char *res = NULL;
+    TALLOC_CTX *tmp_ctx = NULL;
+
+    if (template == NULL) {
+        DEBUG(SSSDBG_CRIT_FAILURE, ("Missing template.\n"));
+        return NULL;
+    }
+
+    tmp_ctx = talloc_new(NULL);
+    if (!tmp_ctx) return NULL;
+
+    copy = talloc_strdup(tmp_ctx, template);
+    if (copy == NULL) {
+        DEBUG(SSSDBG_CRIT_FAILURE, ("talloc_strdup failed.\n"));
+        goto done;
+    }
+
+    result = talloc_strdup(tmp_ctx, "");
+    if (result == NULL) {
+        DEBUG(SSSDBG_CRIT_FAILURE, ("talloc_strdup failed.\n"));
+        goto done;
+    }
+
+    p = copy;
+    while ( (n = strchr(p, '%')) != NULL) {
+        *n = '\0';
+        n++;
+        if ( *n == '\0' ) {
+            DEBUG(SSSDBG_CRIT_FAILURE, ("format error, single %% at the end of "
+                                        "the template.\n"));
+            goto done;
+        }
+        switch( *n ) {
+            case 'u':
+                if (username == NULL) {
+                    DEBUG(SSSDBG_CRIT_FAILURE, ("Cannot expand user name template "
+                                                "because user name is empty.\n"));
+                    goto done;
+                }
+                result = talloc_asprintf_append(result, "%s%s", p,
+                                                username);
+                break;
+
+            case 'U':
+                if (uid == 0) {
+                    DEBUG(SSSDBG_CRIT_FAILURE, ("Cannot expand uid template "
+                                                "because uid is invalid.\n"));
+                    goto done;
+                }
+                result = talloc_asprintf_append(result, "%s%d", p,
+                                                uid);
+                break;
+
+            case 'd':
+                if (domain == NULL) {
+                    DEBUG(SSSDBG_CRIT_FAILURE, ("Cannot expand domain name "
+                                                "template because domain name "
+                                                "is empty.\n"));
+                    goto done;
+                }
+                result = talloc_asprintf_append(result, "%s%s", p,
+                                                domain);
+                break;
+
+            case 'f':
+                if (domain == NULL || username == NULL) {
+                    DEBUG(SSSDBG_CRIT_FAILURE, ("Cannot expand fully qualified "
+                                                "name template because domain "
+                                                "or user name is empty.\n"));
+                    goto done;
+                }
+                result = talloc_asprintf_append(result, "%s%s@%s", p,
+                                                username, domain);
+                break;
+
+            case '%':
+                result = talloc_asprintf_append(result, "%s%%", p);
+                break;
+
+            default:
+                DEBUG(SSSDBG_CRIT_FAILURE, ("format error, unknown template "
+                                            "[%%%c].\n", *n));
+                goto done;
+        }
+
+        if (result == NULL) {
+            DEBUG(SSSDBG_CRIT_FAILURE, ("talloc_asprintf_append failed.\n"));
+            goto done;
+        }
+
+        p = n + 1;
+    }
+
+    result = talloc_asprintf_append(result, "%s", p);
+    if (result == NULL) {
+        DEBUG(SSSDBG_CRIT_FAILURE, ("talloc_asprintf_append failed.\n"));
+        goto done;
+    }
+
+    res = talloc_move(mem_ctx, &result);
+done:
+    talloc_zfree(tmp_ctx);
+    return res;
+}
diff --git a/src/util/sss_nss.h b/src/util/sss_nss.h
new file mode 100644
index 00000000..55e2b7f6
--- /dev/null
+++ b/src/util/sss_nss.h
@@ -0,0 +1,31 @@
+/*
+   SSSD
+
+   Utility functions related to ID information
+
+   Copyright (C) Jan Zeleny <jzeleny@redhat.com> 2012
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __SSS_NSS_H__
+#define __SSS_NSS_H__
+
+#include <sys/types.h>
+#include <talloc.h>
+
+char *expand_homedir_template(TALLOC_CTX *mem_ctx, const char *template,
+                              const char *username, uint32_t uid,
+                              const char *domain);
+#endif