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/* make-dissectors.c
* Tool to build the dissector registration arrays.
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <glib.h>
#include <wsutil/glib-compat.h>
#define ARRAY_RESERVED_SIZE 2048
#define STRING_RESERVED_SIZE (300 * 1024)
#ifdef _WIN32
#define SEP "\r\n"
#else
#define SEP "\n"
#endif
GRegex *protos_regex, *handoffs_regex;
static int
compare_symbols(gconstpointer a, gconstpointer b)
{
return g_strcmp0(*(const char **)a, *(const char **)b);
}
static void
scan_matches(GRegex *regex, const char *string, GPtrArray *dst)
{
GMatchInfo *match_info;
char *match;
g_regex_match(regex, string, G_REGEX_MATCH_NOTEMPTY, &match_info);
while (g_match_info_matches(match_info)) {
match = g_match_info_fetch(match_info, 1);
g_ptr_array_add(dst, match);
g_match_info_next(match_info, NULL);
}
g_match_info_free(match_info);
}
static void
scan_file(const char *file, GPtrArray *protos, GPtrArray *handoffs)
{
char *contents;
GError *err = NULL;
if (!g_file_get_contents(file, &contents, NULL, &err)) {
fprintf(stderr, "%s: %s\n", file, err->message);
exit(1);
}
scan_matches(protos_regex, contents, protos);
scan_matches(handoffs_regex, contents, handoffs);
g_free(contents);
}
static void
scan_list(const char *file, GPtrArray *protos, GPtrArray *handoffs)
{
char *contents, *arg;
GError *err = NULL;
if (!g_file_get_contents(file, &contents, NULL, &err)) {
fprintf(stderr, "%s: %s\n", file, err->message);
exit(1);
}
for (arg = strtok(contents, SEP); arg != NULL; arg = strtok(NULL, SEP)) {
scan_file(arg, protos, handoffs);
}
g_free(contents);
}
int main(int argc, char **argv)
{
GPtrArray *protos = NULL, *handoffs = NULL;
GError *err = NULL;
guint i;
GString *s;
const char *outfile;
guint count_protos, count_handoffs;
if (argc < 3) {
fprintf(stderr, "Usage: %s <outfile> <infiles...>\n", argv[0]);
exit(1);
}
protos = g_ptr_array_new_full(ARRAY_RESERVED_SIZE, g_free);
handoffs = g_ptr_array_new_full(ARRAY_RESERVED_SIZE, g_free);
protos_regex = g_regex_new("void\\s+(proto_register_[[:alnum:]_]+)\\s*\\(\\s*void\\s*\\)\\s*{",
G_REGEX_OPTIMIZE, G_REGEX_MATCH_NOTEMPTY, &err);
if (err) {
fprintf(stderr, "GRegex: %s\n", err->message);
exit(1);
}
handoffs_regex = g_regex_new("void\\s+(proto_reg_handoff_[[:alnum:]_]+)\\s*\\(\\s*void\\s*\\)\\s*{",
G_REGEX_OPTIMIZE, G_REGEX_MATCH_NOTEMPTY, &err);
if (err) {
fprintf(stderr, "GRegex: %s\n", err->message);
exit(1);
}
outfile = argv[1];
for (int arg = 2; arg < argc; arg++) {
if (argv[arg][0] == '@') {
scan_list(&argv[arg][1], protos, handoffs);
}
else {
scan_file(argv[arg], protos, handoffs);
}
}
if (protos->len == 0) {
fprintf(stderr, "No protocol registrations found.\n");
exit(1);
}
g_ptr_array_sort(protos, compare_symbols);
g_ptr_array_sort(handoffs, compare_symbols);
s = g_string_sized_new(STRING_RESERVED_SIZE);
g_string_append(s,
"/*\n"
" * Do not modify this file. Changes will be overwritten.\n"
" *\n"
" * Generated automatically by the \"dissectors.c\" target using\n"
" * \"make-dissectors\".\n"
" */\n"
"\n"
"#include <dissectors.h>\n"
"\n");
g_string_append_printf(s,
"const gulong dissector_reg_proto_count = %d;\n"
"const gulong dissector_reg_handoff_count = %d;\n"
"\n",
protos->len, handoffs->len);
for (i = 0; i < protos->len; i++) {
g_string_append_printf(s, "void %s(void);\n", (char *)protos->pdata[i]);
}
g_string_append(s,
"\n"
"dissector_reg_t dissector_reg_proto[] = {\n");
for (i = 0; i < protos->len; i++) {
g_string_append_printf(s, " { \"%s\", %s },\n", (char *)protos->pdata[i], (char *)protos->pdata[i]);
}
g_string_append(s,
" { NULL, NULL }\n"
"};\n"
"\n");
for (i = 0; i < handoffs->len; i++) {
g_string_append_printf(s, "void %s(void);\n", (char *)handoffs->pdata[i]);
}
g_string_append(s,
"\n"
"dissector_reg_t dissector_reg_handoff[] = {\n");
for (i = 0; i < handoffs->len; i++) {
g_string_append_printf(s, " { \"%s\", %s },\n", (char *)handoffs->pdata[i], (char *)handoffs->pdata[i]);
}
g_string_append(s,
" { NULL, NULL }\n"
"};\n");
if (!g_file_set_contents(outfile, s->str, s->len, &err)) {
fprintf(stderr, "%s: %s\n", outfile, err->message);
exit(1);
}
count_protos = protos->len;
count_handoffs = handoffs->len;
g_string_free(s, TRUE);
g_regex_unref(protos_regex);
g_regex_unref(handoffs_regex);
g_ptr_array_free(protos, TRUE);
g_ptr_array_free(handoffs, TRUE);
printf("Found %u registrations and %u handoffs.\n",
count_protos, count_handoffs);
}
/*
* Editor modelines
*
* Local Variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* ex: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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