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/*++
/* 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 desciption 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);
}
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