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logfmtyaml.c
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logfmtyaml.c
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/*-
* xnumon - monitor macOS for malicious activity
* https://www.roe.ch/xnumon
*
* Copyright (c) 2017-2019, Daniel Roethlisberger <daniel@roe.ch>.
* All rights reserved.
*
* Licensed under the Open Software License version 3.0.
*/
/*
* YAML log format driver
*/
#include "logfmtyaml.h"
#include "logutl.h"
#include "sys.h"
#include <stdbool.h>
#include <stdint.h>
#include <inttypes.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
static char indent[2*LOGFMT_INDENT_MAX+1] = {0};
static size_t indent_level = 0;
static bool reuse_line = false;
static int
logfmtyaml_init(UNUSED config_t *cfg) {
return 0;
}
static void
logfmtyaml_indent_inc(void) {
indent_level++;
assert(indent_level <= LOGFMT_INDENT_MAX);
indent[indent_level * 2 - 2] = ' ';
indent[indent_level * 2 - 1] = ' ';
indent[indent_level * 2] = '\0';
}
static void
logfmtyaml_indent_dec(void) {
assert(indent_level > 0);
indent_level--;
indent[indent_level * 2] = '\0';
}
static void
logfmtyaml_record_begin(FILE *f) {
fprintf(f, "---");
}
static void
logfmtyaml_record_end(FILE *f) {
fputc('\n', f);
}
static void
logfmtyaml_dict_begin(UNUSED FILE *f) {
logfmtyaml_indent_inc();
}
static void
logfmtyaml_dict_end(UNUSED FILE *f) {
logfmtyaml_indent_dec();
}
static void
logfmtyaml_dict_item(FILE *f, const char *label) {
if (reuse_line) {
fprintf(f, " %s:", label);
reuse_line = false;
} else {
fprintf(f, "\n%s%s:", indent, label);
}
}
static void
logfmtyaml_list_begin(UNUSED FILE *f) {
logfmtyaml_indent_inc();
}
static void
logfmtyaml_list_end(UNUSED FILE *f) {
logfmtyaml_indent_dec();
}
static void
logfmtyaml_list_item(FILE *f, UNUSED const char *label) {
fprintf(f, "\n%s-", indent);
reuse_line = true;
}
static void
logfmtyaml_value_null(FILE *f) {
fprintf(f, " null");
reuse_line = false;
}
static void
logfmtyaml_value_bool(FILE *f, bool value) {
fprintf(f, value ? " true" : " false");
reuse_line = false;
}
static void
logfmtyaml_value_int(FILE *f, int64_t value) {
fprintf(f, " %"PRId64, value);
reuse_line = false;
}
static void
logfmtyaml_value_uint(FILE *f, uint64_t value) {
fprintf(f, " %"PRIu64, value);
reuse_line = false;
}
static void
logfmtyaml_value_uint_oct(FILE *f, uint64_t value) {
fprintf(f, " 0o%"PRIo64, value);
reuse_line = false;
}
static void
logfmtyaml_value_timespec(FILE *f, struct timespec *tv) {
assert(tv->tv_sec > 0);
fputc(' ', f);
logutl_fwrite_timespec(f, tv);
reuse_line = false;
}
static void
logfmtyaml_value_ttydev(FILE *f, dev_t dev) {
fprintf(f, " /dev/%s", sys_ttydevname(dev));
reuse_line = false;
}
static void
logfmtyaml_value_buf_hex(FILE *f, const unsigned char *buf, size_t sz) {
fputc(' ', f);
logutl_fwrite_hex(f, buf, sz);
reuse_line = false;
}
/*
* YAML Double-Quoted Style string
*/
static void
logfmtyaml_value_string(FILE *f, const char *s) {
const char *p = s;
size_t sz;
fputc(' ', f);
fputc('"', f);
while (*p != '\0') {
sz = strcspn(p, "\\\"");
if (sz > 0) {
fwrite(p, sz, 1, f);
p = p + sz;
}
while (*p == '\\' || *p == '"') {
fputc('\\', f);
fputc(*p, f);
p++;
}
}
fputc('"', f);
reuse_line = false;
}
logfmt_t logfmtyaml = {
"yaml", false, true,
logfmtyaml_init,
logfmtyaml_record_begin,
logfmtyaml_record_end,
logfmtyaml_dict_begin,
logfmtyaml_dict_end,
logfmtyaml_dict_item,
logfmtyaml_list_begin,
logfmtyaml_list_end,
logfmtyaml_list_item,
logfmtyaml_value_null,
logfmtyaml_value_bool,
logfmtyaml_value_int,
logfmtyaml_value_uint,
logfmtyaml_value_uint_oct,
logfmtyaml_value_timespec,
logfmtyaml_value_ttydev,
logfmtyaml_value_buf_hex,
logfmtyaml_value_string
};