Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/*
2 * Copyright (C) 2002 Jeff Dike (jdike@karaya.com) and
3 * geoffrey hing <ghing@net.ohio-state.edu>
4 * Licensed under the GPL
5 */
6
7#include <errno.h>
8#include <string.h>
9#include <stdio.h>
10#include <stdlib.h>
11#include <unistd.h>
12#include <sys/time.h>
13#include "init.h"
14#include "user.h"
15#include "os.h"
16
17#define TTY_LOG_DIR "./"
18
19/* Set early in boot and then unchanged */
20static char *tty_log_dir = TTY_LOG_DIR;
21static int tty_log_fd = -1;
22
23#define TTY_LOG_OPEN 1
24#define TTY_LOG_CLOSE 2
25#define TTY_LOG_WRITE 3
26#define TTY_LOG_EXEC 4
27
28#define TTY_READ 1
29#define TTY_WRITE 2
30
31struct tty_log_buf {
32 int what;
33 unsigned long tty;
34 int len;
35 int direction;
36 unsigned long sec;
37 unsigned long usec;
38};
39
40int open_tty_log(void *tty, void *current_tty)
41{
42 struct timeval tv;
43 struct tty_log_buf data;
44 char buf[strlen(tty_log_dir) + sizeof("01234567890-01234567\0")];
45 int fd;
46
47 gettimeofday(&tv, NULL);
48 if(tty_log_fd != -1){
49 data = ((struct tty_log_buf) { .what = TTY_LOG_OPEN,
50 .tty = (unsigned long) tty,
51 .len = sizeof(current_tty),
52 .direction = 0,
53 .sec = tv.tv_sec,
54 .usec = tv.tv_usec } );
55 write(tty_log_fd, &data, sizeof(data));
56 write(tty_log_fd, ¤t_tty, data.len);
57 return tty_log_fd;
58 }
59
60 sprintf(buf, "%s/%0u-%0u", tty_log_dir, (unsigned int) tv.tv_sec,
61 (unsigned int) tv.tv_usec);
62
63 fd = os_open_file(buf, of_append(of_create(of_rdwr(OPENFLAGS()))),
64 0644);
65 if(fd < 0){
66 printk("open_tty_log : couldn't open '%s', errno = %d\n",
67 buf, -fd);
68 }
69 return fd;
70}
71
72void close_tty_log(int fd, void *tty)
73{
74 struct tty_log_buf data;
75 struct timeval tv;
76
77 if(tty_log_fd != -1){
78 gettimeofday(&tv, NULL);
79 data = ((struct tty_log_buf) { .what = TTY_LOG_CLOSE,
80 .tty = (unsigned long) tty,
81 .len = 0,
82 .direction = 0,
83 .sec = tv.tv_sec,
84 .usec = tv.tv_usec } );
85 write(tty_log_fd, &data, sizeof(data));
86 return;
87 }
88 os_close_file(fd);
89}
90
91static int log_chunk(int fd, const char *buf, int len)
92{
93 int total = 0, try, missed, n;
94 char chunk[64];
95
96 while(len > 0){
97 try = (len > sizeof(chunk)) ? sizeof(chunk) : len;
98 missed = copy_from_user_proc(chunk, (char *) buf, try);
99 try -= missed;
100 n = write(fd, chunk, try);
101 if(n != try) {
102 if(n < 0)
103 return -errno;
104 return -EIO;
105 }
106 if(missed != 0)
107 return -EFAULT;
108
109 len -= try;
110 total += try;
111 buf += try;
112 }
113
114 return total;
115}
116
117int write_tty_log(int fd, const char *buf, int len, void *tty, int is_read)
118{
119 struct timeval tv;
120 struct tty_log_buf data;
121 int direction;
122
123 if(fd == tty_log_fd){
124 gettimeofday(&tv, NULL);
125 direction = is_read ? TTY_READ : TTY_WRITE;
126 data = ((struct tty_log_buf) { .what = TTY_LOG_WRITE,
127 .tty = (unsigned long) tty,
128 .len = len,
129 .direction = direction,
130 .sec = tv.tv_sec,
131 .usec = tv.tv_usec } );
132 write(tty_log_fd, &data, sizeof(data));
133 }
134
135 return log_chunk(fd, buf, len);
136}
137
138void log_exec(char **argv, void *tty)
139{
140 struct timeval tv;
141 struct tty_log_buf data;
142 char **ptr,*arg;
143 int len;
144
145 if(tty_log_fd == -1) return;
146
147 gettimeofday(&tv, NULL);
148
149 len = 0;
150 for(ptr = argv; ; ptr++){
151 if(copy_from_user_proc(&arg, ptr, sizeof(arg)))
152 return;
153 if(arg == NULL) break;
154 len += strlen_user_proc(arg);
155 }
156
157 data = ((struct tty_log_buf) { .what = TTY_LOG_EXEC,
158 .tty = (unsigned long) tty,
159 .len = len,
160 .direction = 0,
161 .sec = tv.tv_sec,
162 .usec = tv.tv_usec } );
163 write(tty_log_fd, &data, sizeof(data));
164
165 for(ptr = argv; ; ptr++){
166 if(copy_from_user_proc(&arg, ptr, sizeof(arg)))
167 return;
168 if(arg == NULL) break;
169 log_chunk(tty_log_fd, arg, strlen_user_proc(arg));
170 }
171}
172
173extern void register_tty_logger(int (*opener)(void *, void *),
174 int (*writer)(int, const char *, int,
175 void *, int),
176 void (*closer)(int, void *));
177
178static int register_logger(void)
179{
180 register_tty_logger(open_tty_log, write_tty_log, close_tty_log);
181 return 0;
182}
183
184__uml_initcall(register_logger);
185
186static int __init set_tty_log_dir(char *name, int *add)
187{
188 tty_log_dir = name;
189 return 0;
190}
191
192__uml_setup("tty_log_dir=", set_tty_log_dir,
193"tty_log_dir=<directory>\n"
194" This is used to specify the directory where the logs of all pty\n"
195" data from this UML machine will be written.\n\n"
196);
197
198static int __init set_tty_log_fd(char *name, int *add)
199{
200 char *end;
201
202 tty_log_fd = strtoul(name, &end, 0);
203 if((*end != '\0') || (end == name)){
204 printf("set_tty_log_fd - strtoul failed on '%s'\n", name);
205 tty_log_fd = -1;
206 }
207
208 *add = 0;
209 return 0;
210}
211
212__uml_setup("tty_log_fd=", set_tty_log_fd,
213"tty_log_fd=<fd>\n"
214" This is used to specify a preconfigured file descriptor to which all\n"
215" tty data will be written. Preconfigure the descriptor with something\n"
216" like '10>tty_log tty_log_fd=10'.\n\n"
217);