1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Mini klogd implementation for busybox
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4 | *
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5 | * Copyright (C) 2001 by Gennady Feldman <gfeldman@gena01.com>.
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6 | * Changes: Made this a standalone busybox module which uses standalone
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7 | * syslog() client interface.
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8 | *
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9 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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10 | *
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11 | * Copyright (C) 2000 by Karl M. Hegbloom <karlheg@debian.org>
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12 | *
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13 | * "circular buffer" Copyright (C) 2000 by Gennady Feldman <gfeldman@gena01.com>
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14 | *
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15 | * Maintainer: Gennady Feldman <gfeldman@gena01.com> as of Mar 12, 2001
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16 | *
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17 | * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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18 | */
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19 |
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20 | #include "libbb.h"
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21 | #include <sys/syslog.h>
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22 | #include <sys/klog.h>
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23 |
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24 | static void klogd_signal(int sig ATTRIBUTE_UNUSED)
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25 | {
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26 | klogctl(7, NULL, 0);
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27 | klogctl(0, 0, 0);
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28 | syslog(LOG_NOTICE, "Kernel log daemon exiting");
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29 | exit(EXIT_SUCCESS);
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30 | }
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31 |
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32 | #define OPT_LEVEL 1
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33 | #define OPT_FOREGROUND 2
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34 |
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35 | #define KLOGD_LOGBUF_SIZE BUFSIZ
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36 | #define log_buffer bb_common_bufsiz1
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37 |
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38 | int klogd_main(int argc, char **argv);
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39 | int klogd_main(int argc, char **argv)
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40 | {
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41 | int i = i; /* silence gcc */
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42 | char *start;
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43 |
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44 | /* do normal option parsing */
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45 | getopt32(argv, "c:n", &start);
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46 |
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47 | if (option_mask32 & OPT_LEVEL) {
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48 | /* Valid levels are between 1 and 8 */
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49 | i = xatoul_range(start, 1, 8);
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50 | }
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51 |
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52 | if (!(option_mask32 & OPT_FOREGROUND)) {
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53 | bb_daemonize_or_rexec(DAEMON_CHDIR_ROOT, argv);
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54 | }
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55 |
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56 | openlog("kernel", 0, LOG_KERN);
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57 |
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58 | /* Set up sig handlers */
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59 | signal(SIGINT, klogd_signal);
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60 | signal(SIGKILL, klogd_signal);
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61 | signal(SIGTERM, klogd_signal);
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62 | signal(SIGHUP, SIG_IGN);
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63 |
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64 | /* "Open the log. Currently a NOP." */
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65 | klogctl(1, NULL, 0);
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66 |
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67 | /* Set level of kernel console messaging. */
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68 | if (option_mask32 & OPT_LEVEL)
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69 | klogctl(8, NULL, i);
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70 |
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71 | syslog(LOG_NOTICE, "klogd started: %s", bb_banner);
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72 |
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73 | /* Note: this code does not detect incomplete messages
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74 | * (messages not ending with '\n' or just when kernel
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75 | * generates too many messages for us to keep up)
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76 | * and will split them in two separate lines */
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77 | while (1) {
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78 | int n;
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79 | int priority;
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80 |
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81 | n = klogctl(2, log_buffer, KLOGD_LOGBUF_SIZE - 1);
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82 | if (n < 0) {
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83 | if (errno == EINTR)
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84 | continue;
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85 | syslog(LOG_ERR, "klogd: error from klogctl(2): %d - %m",
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86 | errno);
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87 | break;
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88 | }
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89 | log_buffer[n] = '\n';
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90 | i = 0;
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91 | while (i < n) {
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92 | priority = LOG_INFO;
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93 | start = &log_buffer[i];
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94 | if (log_buffer[i] == '<') {
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95 | i++;
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96 | // kernel never ganerates multi-digit prios
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97 | //priority = 0;
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98 | //while (log_buffer[i] >= '0' && log_buffer[i] <= '9') {
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99 | // priority = priority * 10 + (log_buffer[i] - '0');
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100 | // i++;
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101 | //}
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102 | if (isdigit(log_buffer[i])) {
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103 | priority = (log_buffer[i] - '0');
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104 | i++;
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105 | }
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106 | if (log_buffer[i] == '>')
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107 | i++;
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108 | start = &log_buffer[i];
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109 | }
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110 | while (log_buffer[i] != '\n')
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111 | i++;
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112 | log_buffer[i] = '\0';
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113 | syslog(priority, "%s", start);
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114 | i++;
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115 | }
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116 | }
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117 |
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118 | return EXIT_FAILURE;
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119 | }
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