Move parsing of names and domains into util/

2 files changed, 134 insertions, 0 deletions

diff --git a/server/util/usertools.c b/server/util/usertools.c
index 07930613..220b52cb 100644
--- a/server/util/usertools.c
+++ b/server/util/usertools.c
@@ -20,8 +20,15 @@
 */
 
 #include <pwd.h>
+#include <pcre.h>
+#include <errno.h>
 #include <talloc.h>
 
+#include "confdb/confdb.h"
+#include "util/util.h"
+
+#define NAMES_CONFIG "config/names"
+
 char *get_username_from_uid(TALLOC_CTX *mem_ctx, uid_t uid)
 {
     char *username;
@@ -33,3 +40,114 @@ char *get_username_from_uid(TALLOC_CTX *mem_ctx, uid_t uid)
     username = talloc_strdup(mem_ctx, pwd->pw_name);
     return username;
 }
+
+int sss_names_init(TALLOC_CTX *mem_ctx, struct confdb_ctx *cdb, struct sss_names_ctx **out)
+{
+    struct sss_names_ctx *ctx = NULL;
+    const char *errstr;
+    int errval;
+    int errpos;
+    int ret;
+
+    ctx = talloc_zero(ctx, struct sss_names_ctx);
+    if (!ctx) return ENOMEM;
+
+    ret = confdb_get_string(cdb, ctx, NAMES_CONFIG,
+                            "re-expression", NULL, &ctx->re_pattern);
+    if (ret != EOK) goto done;
+
+    if (!ctx->re_pattern) {
+        ctx->re_pattern = talloc_strdup(ctx,
+                                "(?<name>[^@]+)@?(?<domain>[^@]*$)");
+        if (!ctx->re_pattern) {
+            ret = ENOMEM;
+            goto done;
+        }
+    }
+
+    ret = confdb_get_string(cdb, ctx, NAMES_CONFIG,
+                            "full-name-format", NULL, &ctx->fq_fmt);
+    if (ret != EOK) goto done;
+
+    if (!ctx->fq_fmt) {
+        ctx->fq_fmt = talloc_strdup(ctx, "%1$s@%2$s");
+        if (!ctx->fq_fmt) {
+            ret = ENOMEM;
+            goto done;
+        }
+    }
+
+    ctx->re = pcre_compile2(ctx->re_pattern,
+                            PCRE_DUPNAMES | PCRE_EXTENDED,
+                            &errval, &errstr, &errpos, NULL);
+    if (!ctx->re) {
+        DEBUG(1, ("Invalid Regular Expression pattern at position %d."
+                  " (Error: %d [%s])\n", errpos, errval, errstr));
+        ret = EFAULT;
+        goto done;
+    }
+
+    *out = ctx;
+    ret = EOK;
+
+done:
+    if (ret != EOK) {
+        talloc_free(ctx);
+    }
+    return ret;
+}
+
+int sss_parse_name(TALLOC_CTX *memctx,
+                   struct sss_names_ctx *snctx,
+                   const char *orig, char **domain, char **name)
+{
+    pcre *re = snctx->re;
+    const char *result;
+    int ovec[30];
+    int origlen;
+    int ret, strnum;
+
+    origlen = strlen(orig);
+
+    ret = pcre_exec(re, NULL, orig, origlen, 0, PCRE_NOTEMPTY, ovec, 30);
+    if (ret < 0) {
+        DEBUG(2, ("PCRE Matching error, %d\n", ret));
+        return EINVAL;
+    }
+
+    if (ret == 0) {
+        DEBUG(1, ("Too many matches, the pattern is invalid.\n"));
+    }
+
+    strnum = ret;
+
+    result = NULL;
+    ret = pcre_get_named_substring(re, orig, ovec, strnum, "name", &result);
+    if (ret < 0  || !result) {
+        DEBUG(2, ("Name not found!\n"));
+        return EINVAL;
+    }
+    *name = talloc_strdup(memctx, result);
+    pcre_free_substring(result);
+    if (!*name) return ENOMEM;
+
+
+    result = NULL;
+    ret = pcre_get_named_substring(re, orig, ovec, strnum, "domain", &result);
+    if (ret < 0  || !result) {
+        DEBUG(4, ("Domain not provided!\n"));
+        *domain = NULL;
+    } else {
+        /* ignore "" string */
+        if (*result) {
+            *domain = talloc_strdup(memctx, result);
+            pcre_free_substring(result);
+            if (!*domain) return ENOMEM;
+        } else {
+            pcre_free_substring(result);
+            *domain = NULL;
+        }
+    }
+
+    return EOK;
+}
diff --git a/server/util/util.h b/server/util/util.h
index 82c0be22..c4e3e49d 100644
--- a/server/util/util.h
+++ b/server/util/util.h
@@ -9,6 +9,7 @@
 #include <errno.h>
 #include <limits.h>
 #include <time.h>
+#include <pcre.h>
 #include "config.h"
 #include "talloc.h"
 #include "tevent.h"
@@ -144,4 +145,19 @@ int password_destructor(void *memctx);
 /* from usertools.c */
 char *get_username_from_uid(TALLOC_CTX *mem_ctx, uid_t uid);
 
+struct sss_names_ctx {
+    char *re_pattern;
+    char *fq_fmt;
+
+    pcre *re;
+};
+
+int sss_names_init(TALLOC_CTX *mem_ctx,
+                   struct confdb_ctx *cdb,
+                   struct sss_names_ctx **out);
+
+int sss_parse_name(TALLOC_CTX *memctx,
+                   struct sss_names_ctx *snctx,
+                   const char *orig, char **domain, char **name);
+
 #endif /* __SSSD_UTIL_H__ */