1 | #include <stdarg.h>
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2 | #include <sys/socket.h>
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3 | #include <stdio.h>
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4 | #include <unistd.h>
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5 | #include <syslog.h>
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6 | #include <time.h>
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7 | #include <signal.h>
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8 | #include <string.h>
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9 | #include <pthread.h>
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10 | #include <errno.h>
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11 | #include <fcntl.h>
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12 | #include "libc.h"
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13 |
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14 | static volatile int lock[2];
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15 | static char log_ident[32];
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16 | static int log_opt;
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17 | static int log_facility = LOG_USER;
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18 | static int log_mask = 0xff;
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19 | static int log_fd = -1;
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20 |
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21 | int setlogmask(int maskpri)
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22 | {
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23 | LOCK(lock);
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24 | int ret = log_mask;
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25 | if (maskpri) log_mask = maskpri;
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26 | UNLOCK(lock);
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27 | return ret;
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28 | }
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29 |
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30 | static const struct {
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31 | short sun_family;
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32 | char sun_path[9];
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33 | } log_addr = {
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34 | AF_UNIX,
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35 | "/dev/log"
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36 | };
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37 |
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38 | void closelog(void)
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39 | {
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40 | int cs;
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41 | pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
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42 | LOCK(lock);
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43 | close(log_fd);
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44 | log_fd = -1;
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45 | UNLOCK(lock);
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46 | pthread_setcancelstate(cs, 0);
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47 | }
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48 |
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49 | static void __openlog()
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50 | {
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51 | log_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0);
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52 | if (log_fd >= 0) connect(log_fd, (void *)&log_addr, sizeof log_addr);
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53 | }
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54 |
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55 | void openlog(const char *ident, int opt, int facility)
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56 | {
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57 | int cs;
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58 | pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
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59 | LOCK(lock);
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60 |
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61 | if (ident) {
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62 | size_t n = strnlen(ident, sizeof log_ident - 1);
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63 | memcpy(log_ident, ident, n);
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64 | log_ident[n] = 0;
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65 | } else {
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66 | log_ident[0] = 0;
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67 | }
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68 | log_opt = opt;
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69 | log_facility = facility;
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70 |
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71 | if ((opt & LOG_NDELAY) && log_fd<0) __openlog();
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72 |
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73 | UNLOCK(lock);
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74 | pthread_setcancelstate(cs, 0);
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75 | }
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76 |
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77 | static int is_lost_conn(int e)
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78 | {
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79 | return e==ECONNREFUSED || e==ECONNRESET || e==ENOTCONN || e==EPIPE;
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80 | }
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81 |
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82 | static void _vsyslog(int priority, const char *message, va_list ap)
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83 | {
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84 | char timebuf[16];
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85 | time_t now;
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86 | struct tm tm;
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87 | char buf[1024];
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88 | int errno_save = errno;
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89 | int pid;
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90 | int l, l2;
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91 | int hlen;
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92 | int fd;
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93 |
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94 | if (log_fd < 0) __openlog();
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95 |
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96 | if (!(priority & LOG_FACMASK)) priority |= log_facility;
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97 |
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98 | now = time(NULL);
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99 | gmtime_r(&now, &tm);
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100 | strftime(timebuf, sizeof timebuf, "%b %e %T", &tm);
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101 |
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102 | pid = (log_opt & LOG_PID) ? getpid() : 0;
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103 | l = snprintf(buf, sizeof buf, "<%d>%s %n%s%s%.0d%s: ",
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104 | priority, timebuf, &hlen, log_ident, "["+!pid, pid, "]"+!pid);
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105 | errno = errno_save;
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106 | l2 = vsnprintf(buf+l, sizeof buf - l, message, ap);
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107 | if (l2 >= 0) {
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108 | if (l2 >= sizeof buf - l) l = sizeof buf - 1;
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109 | else l += l2;
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110 | if (buf[l-1] != '\n') buf[l++] = '\n';
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111 | if (send(log_fd, buf, l, 0) < 0 && (!is_lost_conn(errno)
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112 | || connect(log_fd, (void *)&log_addr, sizeof log_addr) < 0
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113 | || send(log_fd, buf, l, 0) < 0)
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114 | && (log_opt & LOG_CONS)) {
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115 | fd = open("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
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116 | if (fd >= 0) {
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117 | dprintf(fd, "%.*s", l-hlen, buf+hlen);
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118 | close(fd);
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119 | }
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120 | }
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121 | if (log_opt & LOG_PERROR) dprintf(2, "%.*s", l-hlen, buf+hlen);
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122 | }
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123 | }
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124 |
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125 | void __vsyslog(int priority, const char *message, va_list ap)
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126 | {
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127 | int cs;
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128 | if (!(log_mask & LOG_MASK(priority&7)) || (priority&~0x3ff)) return;
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129 | pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
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130 | LOCK(lock);
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131 | _vsyslog(priority, message, ap);
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132 | UNLOCK(lock);
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133 | pthread_setcancelstate(cs, 0);
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134 | }
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135 |
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136 | void syslog(int priority, const char *message, ...)
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137 | {
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138 | va_list ap;
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139 | va_start(ap, message);
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140 | __vsyslog(priority, message, ap);
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141 | va_end(ap);
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142 | }
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143 |
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144 | weak_alias(__vsyslog, vsyslog);
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