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// SPDX-License-Identifier: GPL-3.0-or-later
#include "log2journal.h"
#define LOGFMT_ERROR_LINE_MAX 1024
#define LOGFMT_KEY_MAX 1024
struct logfmt_state {
LOG_JOB *jb;
const char *line;
uint32_t pos;
uint32_t key_start;
char key[LOGFMT_KEY_MAX];
char msg[LOGFMT_ERROR_LINE_MAX];
};
#define logfmt_current_pos(lfs) &(lfs)->line[(lfs)->pos]
#define logfmt_consume_char(lfs) ++(lfs)->pos
static inline void logfmt_process_key_value(LOGFMT_STATE *lfs, const char *value, size_t len) {
log_job_send_extracted_key_value(lfs->jb, lfs->key, value, len);
}
static inline void logfmt_skip_spaces(LOGFMT_STATE *lfs) {
const char *s = logfmt_current_pos(lfs);
const char *start = s;
while(isspace(*s)) s++;
lfs->pos += s - start;
}
static inline void copy_newline(LOGFMT_STATE *lfs __maybe_unused, char **d, size_t *remaining) {
if(*remaining > 3) {
*(*d)++ = '\\';
*(*d)++ = 'n';
(*remaining) -= 2;
}
}
static inline void copy_tab(LOGFMT_STATE *lfs __maybe_unused, char **d, size_t *remaining) {
if(*remaining > 3) {
*(*d)++ = '\\';
*(*d)++ = 't';
(*remaining) -= 2;
}
}
static inline bool logftm_parse_value(LOGFMT_STATE *lfs) {
static __thread char value[JOURNAL_MAX_VALUE_LEN];
char quote = '\0';
const char *s = logfmt_current_pos(lfs);
if(*s == '\"' || *s == '\'') {
quote = *s;
logfmt_consume_char(lfs);
}
value[0] = '\0';
char *d = value;
s = logfmt_current_pos(lfs);
size_t remaining = sizeof(value);
char end_char = (char)(quote == '\0' ? ' ' : quote);
while (*s && *s != end_char) {
char c;
if (*s == '\\') {
s++;
switch (*s) {
case 'n':
copy_newline(lfs, &d, &remaining);
s++;
continue;
case 't':
copy_tab(lfs, &d, &remaining);
s++;
continue;
case 'f':
case 'b':
case 'r':
c = ' ';
s++;
break;
default:
c = *s++;
break;
}
}
else
c = *s++;
if(remaining < 2) {
snprintf(lfs->msg, sizeof(lfs->msg),
"LOGFMT PARSER: truncated string value at pos %zu", lfs->pos);
return false;
}
else {
*d++ = c;
remaining--;
}
}
*d = '\0';
lfs->pos += s - logfmt_current_pos(lfs);
s = logfmt_current_pos(lfs);
if(quote != '\0') {
if (*s != quote) {
snprintf(lfs->msg, sizeof(lfs->msg),
"LOGFMT PARSER: missing quote at pos %zu: '%s'",
lfs->pos, s);
return false;
}
else
logfmt_consume_char(lfs);
}
if(d > value)
logfmt_process_key_value(lfs, value, d - value);
return true;
}
static inline bool logfmt_parse_key(LOGFMT_STATE *lfs) {
logfmt_skip_spaces(lfs);
char *d = &lfs->key[lfs->key_start];
size_t remaining = sizeof(lfs->key) - (d - lfs->key);
const char *s = logfmt_current_pos(lfs);
char last_c = '\0';
while(*s && *s != '=') {
char c;
if (*s == '\\')
s++;
c = journal_key_characters_map[(unsigned char)*s++];
if(c == '_' && last_c == '_')
continue;
else {
if(remaining < 2) {
snprintf(lfs->msg, sizeof(lfs->msg),
"LOGFMT PARSER: key buffer full - keys are too long, at pos %zu", lfs->pos);
return false;
}
*d++ = c;
remaining--;
}
last_c = c;
}
*d = '\0';
lfs->pos += s - logfmt_current_pos(lfs);
s = logfmt_current_pos(lfs);
if(*s != '=') {
snprintf(lfs->msg, sizeof(lfs->msg),
"LOGFMT PARSER: key is missing the equal sign, at pos %zu", lfs->pos);
return false;
}
logfmt_consume_char(lfs);
return true;
}
LOGFMT_STATE *logfmt_parser_create(LOG_JOB *jb) {
LOGFMT_STATE *lfs = mallocz(sizeof(LOGFMT_STATE));
memset(lfs, 0, sizeof(LOGFMT_STATE));
lfs->jb = jb;
if(jb->prefix)
lfs->key_start = copy_to_buffer(lfs->key, sizeof(lfs->key), lfs->jb->prefix, strlen(lfs->jb->prefix));
return lfs;
}
void logfmt_parser_destroy(LOGFMT_STATE *lfs) {
if(lfs)
freez(lfs);
}
const char *logfmt_parser_error(LOGFMT_STATE *lfs) {
return lfs->msg;
}
bool logfmt_parse_document(LOGFMT_STATE *lfs, const char *txt) {
lfs->line = txt;
lfs->pos = 0;
lfs->msg[0] = '\0';
const char *s;
do {
if(!logfmt_parse_key(lfs))
return false;
if(!logftm_parse_value(lfs))
return false;
logfmt_skip_spaces(lfs);
s = logfmt_current_pos(lfs);
} while(*s);
return true;
}
void logfmt_test(void) {
LOG_JOB jb = { .prefix = "NIGNX_" };
LOGFMT_STATE *logfmt = logfmt_parser_create(&jb);
logfmt_parse_document(logfmt, "x=1 y=2 z=\"3 \\ 4\" 5 ");
logfmt_parser_destroy(logfmt);
}
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