1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
/*
* Copyright (C) 2021 Yubico AB - See COPYING
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdarg.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include "debug.h"
#define DEBUG_FMT "debug(pam_u2f): %s:%d (%s): %s%s"
#define MSGLEN 2048
FILE *debug_open(const char *filename) {
struct stat st;
FILE *file;
int fd;
if (strcmp(filename, "stdout") == 0)
return stdout;
if (strcmp(filename, "stderr") == 0)
return stderr;
if (strcmp(filename, "syslog") == 0)
return NULL;
fd = open(filename, O_WRONLY | O_APPEND | O_CLOEXEC | O_NOFOLLOW | O_NOCTTY);
if (fd == -1 || fstat(fd, &st) != 0)
goto err;
#ifndef WITH_FUZZING
if (!S_ISREG(st.st_mode))
goto err;
#endif
if ((file = fdopen(fd, "a")) != NULL)
return file;
err:
if (fd != -1)
close(fd);
return DEFAULT_DEBUG_FILE; /* fallback to default */
}
void debug_close(FILE *f) {
if (f != NULL && f != stdout && f != stderr)
fclose(f);
}
static void do_log(FILE *debug_file, const char *file, int line,
const char *func, const char *msg, const char *suffix) {
#ifndef WITH_FUZZING
if (debug_file == NULL) {
syslog(LOG_AUTHPRIV | LOG_DEBUG, DEBUG_FMT, file, line, func, msg, suffix);
} else {
fprintf(debug_file, DEBUG_FMT "\n", file, line, func, msg, suffix);
}
#else
(void) debug_file;
snprintf(NULL, 0, DEBUG_FMT, file, line, func, msg, suffix);
#endif
}
ATTRIBUTE_FORMAT(printf, 5, 0)
static void debug_vfprintf(FILE *debug_file, const char *file, int line,
const char *func, const char *fmt, va_list args) {
const char *bn;
char msg[MSGLEN];
int r;
if ((bn = strrchr(file, '/')) != NULL)
file = bn + 1;
if ((r = vsnprintf(msg, sizeof(msg), fmt, args)) < 0)
do_log(debug_file, file, line, func, __func__, "");
else
do_log(debug_file, file, line, func, msg,
(size_t) r < sizeof(msg) ? "" : "[truncated]");
}
void debug_fprintf(FILE *debug_file, const char *file, int line,
const char *func, const char *fmt, ...) {
va_list ap;
va_start(ap, fmt);
debug_vfprintf(debug_file, file, line, func, fmt, ap);
va_end(ap);
}
|
