From b5896ba9f6047e7031e2bdee0622d543e11a6734 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Mon, 6 May 2024 03:46:30 +0200 Subject: Adding upstream version 3.4.23. Signed-off-by: Daniel Baumann --- src/util/dict_file.c | 231 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 231 insertions(+) create mode 100644 src/util/dict_file.c (limited to 'src/util/dict_file.c') diff --git a/src/util/dict_file.c b/src/util/dict_file.c new file mode 100644 index 0000000..eb86b35 --- /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 +/* +/* 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 +#include +#include + + /* + * Utility library. + */ +#include +#include +#include +#include +#include +#include + + /* + * 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); +} -- cgit v1.2.3