1 files changed, 231 insertions, 0 deletions
diff --git a/src/util/dict_file.c b/src/util/dict_file.c
new file mode 100644
index 0000000..c6ea74c
--- /dev/null
+++ b/src/util/dict_file.c
@@ -0,0 +1,231 @@
+/*++
+/* NAME
+/*	dict_file_to_buf 3
+/* SUMMARY
+/*	include content from file as blob
+/* SYNOPSIS
+/*	#include <dict.h>
+/*
+/*	VSTRING	*dict_file_to_buf(
+/*	DICT	*dict,
+/*	const char *pathnames)
+/*
+/*	VSTRING	*dict_file_to_b64(
+/*	DICT	*dict,
+/*	const char *pathnames)
+/*
+/*	VSTRING	*dict_file_from_b64(
+/*	DICT	*dict,
+/*	const char *value)
+/*
+/*	char	*dict_file_get_error(
+/*	DICT	*dict)
+/*
+/*	void	dict_file_purge_buffers(
+/*	DICT	*dict)
+/*
+/*	const char *dict_file_lookup(
+/*	DICT	*dict)
+/* DESCRIPTION
+/*	dict_file_to_buf() reads the content of the specified files,
+/*	with names separated by CHARS_COMMA_SP, while inserting a
+/*	gratuitous newline character between files. It returns a
+/*	pointer to a buffer which is owned by the DICT, or a null
+/*	pointer in case of error.
+/*
+/*	dict_file_to_b64() invokes dict_file_to_buf() and converts
+/*	the result to base64. It returns a pointer to a buffer which
+/*	is owned by the DICT, or a null pointer in case of error.
+/*
+/*	dict_file_from_b64() converts a value from base64. It returns
+/*	a pointer to a buffer which is owned by the DICT, or a null
+/*	pointer in case of error.
+/*
+/*	dict_file_purge_buffers() disposes of dict_file-related
+/*	memory that are associated with this DICT.
+/*
+/*	dict_file_get_error() should be called only after error;
+/*	it returns a description of the problem. Storage is owned
+/*	by the caller.
+/*
+/*	dict_file_lookup() wraps the dictionary lookup method and
+/*	decodes the base64 lookup result. The dictionary must be
+/*	opened with DICT_FLAG_SRC_RHS_IS_FILE. Sets dict->error to
+/*	DICT_ERR_CONFIG if the content is invalid. Decoding is not
+/*	built into the dict->lookup() method, because that would
+/*	complicate the implementation of map nesting (inline, thash),
+/*	map composition (pipemap, unionmap), and map proxying.
+/* DIAGNOSTICS
+/*	Panic: interface violation.
+/*
+/*	In case of error the VSTRING result value is a null pointer, and
+/*	an error description can be retrieved with dict_file_get_error().
+/*	The storage is owned by the caller.
+/* LICENSE
+/* .ad
+/* .fi
+/*	The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/*	Wietse Venema
+/*	Google, Inc.
+/*	111 8th Avenue
+/*	New York, NY 10011, USA
+/*--*/
+
+ /*
+  * System library.
+  */
+#include <sys_defs.h>
+#include <sys/stat.h>
+#include <string.h>
+
+ /*
+  * Utility library.
+  */
+#include <base64_code.h>
+#include <dict.h>
+#include <msg.h>
+#include <mymalloc.h>
+#include <vstream.h>
+#include <vstring.h>
+
+ /*
+  * SLMs.
+  */
+#define STR(x) vstring_str(x)
+#define LEN(x) VSTRING_LEN(x)
+
+/* dict_file_to_buf - read files into a buffer */
+
+VSTRING *dict_file_to_buf(DICT *dict, const char *pathnames)
+{
+    struct stat st;
+    VSTREAM *fp = 0;
+    ARGV   *argv;
+    char  **cpp;
+
+    /* dict_file_to_buf() postcondition: dict->file_buf exists. */
+    if (dict->file_buf == 0)
+	dict->file_buf = vstring_alloc(100);
+
+#define DICT_FILE_RETURN(retval) do { \
+	argv_free(argv); \
+	if (fp) vstream_fclose(fp); \
+	return (retval); \
+    } while (0);
+
+    argv = argv_split(pathnames, CHARS_COMMA_SP);
+    if (argv->argc == 0) {
+	vstring_sprintf(dict->file_buf, "empty pathname list: >>%s<<'",
+			pathnames);
+	DICT_FILE_RETURN(0);
+    }
+    VSTRING_RESET(dict->file_buf);
+    for (cpp = argv->argv; *cpp; cpp++) {
+	if ((fp = vstream_fopen(*cpp, O_RDONLY, 0)) == 0
+	    || fstat(vstream_fileno(fp), &st) < 0) {
+	    vstring_sprintf(dict->file_buf, "open %s: %m", *cpp);
+	    DICT_FILE_RETURN(0);
+	}
+	if (st.st_size > SSIZE_T_MAX - LEN(dict->file_buf)) {
+	    vstring_sprintf(dict->file_buf, "file too large: %s", pathnames);
+	    DICT_FILE_RETURN(0);
+	}
+	if (vstream_fread_app(fp, dict->file_buf, st.st_size) != st.st_size) {
+	    vstring_sprintf(dict->file_buf, "read %s: %m", *cpp);
+	    DICT_FILE_RETURN(0);
+	}
+	(void) vstream_fclose(fp);
+	fp = 0;
+	if (cpp[1] != 0)
+	    VSTRING_ADDCH(dict->file_buf, '\n');
+    }
+    VSTRING_TERMINATE(dict->file_buf);
+    DICT_FILE_RETURN(dict->file_buf);
+}
+
+/* dict_file_to_b64 - read files into a base64-encoded buffer */
+
+VSTRING *dict_file_to_b64(DICT *dict, const char *pathnames)
+{
+    ssize_t helper;
+
+    if (dict_file_to_buf(dict, pathnames) == 0)
+	return (0);
+    if (dict->file_b64 == 0)
+	dict->file_b64 = vstring_alloc(100);
+    helper = (LEN(dict->file_buf) + 2) / 3;
+    if (helper > SSIZE_T_MAX / 4) {
+	vstring_sprintf(dict->file_buf, "file too large: %s", pathnames);
+	return (0);
+    }
+    VSTRING_RESET(dict->file_b64);
+    VSTRING_SPACE(dict->file_b64, helper * 4);
+    return (base64_encode(dict->file_b64, STR(dict->file_buf),
+			  LEN(dict->file_buf)));
+}
+
+/* dict_file_from_b64 - convert value from base64 */
+
+VSTRING *dict_file_from_b64(DICT *dict, const char *value)
+{
+    ssize_t helper;
+    VSTRING *result;
+
+    if (dict->file_buf == 0)
+	dict->file_buf = vstring_alloc(100);
+    helper = strlen(value) / 4;
+    VSTRING_RESET(dict->file_buf);
+    VSTRING_SPACE(dict->file_buf, helper * 3);
+    result = base64_decode(dict->file_buf, value, strlen(value));
+    if (result == 0)
+	vstring_sprintf(dict->file_buf, "malformed BASE64 value: %.30s", value);
+    return (result);
+}
+
+/* dict_file_get_error - return error text */
+
+char   *dict_file_get_error(DICT *dict)
+{
+    if (dict->file_buf == 0)
+	msg_panic("dict_file_get_error: no buffer");
+    return (mystrdup(STR(dict->file_buf)));
+}
+
+/* dict_file_purge_buffers - purge file buffers */
+
+void    dict_file_purge_buffers(DICT *dict)
+{
+    if (dict->file_buf) {
+	vstring_free(dict->file_buf);
+	dict->file_buf = 0;
+    }
+    if (dict->file_b64) {
+	vstring_free(dict->file_b64);
+	dict->file_b64 = 0;
+    }
+}
+
+/* dict_file_lookup - look up and decode dictionary entry */
+
+const char *dict_file_lookup(DICT *dict, const char *key)
+{
+    const char myname[] = "dict_file_lookup";
+    const char *res;
+    VSTRING *unb64;
+    char   *err;
+
+    if ((dict->flags & DICT_FLAG_SRC_RHS_IS_FILE) == 0)
+	msg_panic("%s: dictionary opened without DICT_FLAG_SRC_RHS_IS_FILE",
+		  myname);
+    if ((res = dict->lookup(dict, key)) == 0)
+	return (0);
+    if ((unb64 = dict_file_from_b64(dict, res)) == 0) {
+	err = dict_file_get_error(dict);
+	msg_warn("table %s:%s: key %s: %s", dict->type, dict->name, key, err);
+	myfree(err);
+	dict->error = DICT_ERR_CONFIG;
+	return (0);
+    }
+    return STR(unb64);
+}