arch/um/kernel/tty_log.c

   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 "kern_util.h"
  16 #include "os.h"
  17
  18 #define TTY_LOG_DIR "./"
  19
  20 /* Set early in boot and then unchanged */
  21 static char *tty_log_dir = TTY_LOG_DIR;
  22 static int tty_log_fd = -1;
  23
  24 #define TTY_LOG_OPEN 1
  25 #define TTY_LOG_CLOSE 2
  26 #define TTY_LOG_WRITE 3
  27 #define TTY_LOG_EXEC 4
  28
  29 #define TTY_READ 1
  30 #define TTY_WRITE 2
  31
  32 struct tty_log_buf {
  33         int what;
  34         unsigned long tty;
  35         int len;
  36         int direction;
  37         unsigned long sec;
  38         unsigned long usec;
  39 };
  40
  41 int open_tty_log(void *tty, void *current_tty)
  42 {
  43         struct timeval tv;
  44         struct tty_log_buf data;
  45         char buf[strlen(tty_log_dir) + sizeof("01234567890-01234567\0")];
  46         int fd;
  47
  48         gettimeofday(&tv, NULL);
  49         if(tty_log_fd != -1){
  50                 data = ((struct tty_log_buf) { .what    = TTY_LOG_OPEN,
  51                                                .tty  = (unsigned long) tty,
  52                                                .len  = sizeof(current_tty),
  53                                                .direction = 0,
  54                                                .sec = tv.tv_sec,
  55                                                .usec = tv.tv_usec } );
  56                 os_write_file(tty_log_fd, &data, sizeof(data));
  57                 os_write_file(tty_log_fd, &current_tty, data.len);
  58                 return(tty_log_fd);
  59         }
  60
  61         sprintf(buf, "%s/%0u-%0u", tty_log_dir, (unsigned int) tv.tv_sec,
  62                 (unsigned int) tv.tv_usec);
  63
  64         fd = os_open_file(buf, of_append(of_create(of_rdwr(OPENFLAGS()))),
  65                           0644);
  66         if(fd < 0){
  67                 printk("open_tty_log : couldn't open '%s', errno = %d\n",
  68                        buf, -fd);
  69         }
  70         return(fd);
  71 }
  72
  73 void close_tty_log(int fd, void *tty)
  74 {
  75         struct tty_log_buf data;
  76         struct timeval tv;
  77
  78         if(tty_log_fd != -1){
  79                 gettimeofday(&tv, NULL);
  80                 data = ((struct tty_log_buf) { .what    = TTY_LOG_CLOSE,
  81                                                .tty  = (unsigned long) tty,
  82                                                .len  = 0,
  83                                                .direction = 0,
  84                                                .sec = tv.tv_sec,
  85                                                .usec = tv.tv_usec } );
  86                 os_write_file(tty_log_fd, &data, sizeof(data));
  87                 return;
  88         }
  89         os_close_file(fd);
  90 }
  91
  92 static int log_chunk(int fd, const char *buf, int len)
  93 {
  94         int total = 0, try, missed, n;
  95         char chunk[64];
  96
  97         while(len > 0){
  98                 try = (len > sizeof(chunk)) ? sizeof(chunk) : len;
  99                 missed = copy_from_user_proc(chunk, (char *) buf, try);
 100                 try -= missed;
 101                 n = os_write_file(fd, chunk, try);
 102                 if(n != try) {
 103                         if(n < 0)
 104                                 return(n);
 105                         return(-EIO);
 106                 }
 107                 if(missed != 0)
 108                         return(-EFAULT);
 109
 110                 len -= try;
 111                 total += try;
 112                 buf += try;
 113         }
 114
 115         return(total);
 116 }
 117
 118 int write_tty_log(int fd, const char *buf, int len, void *tty, int is_read)
 119 {
 120         struct timeval tv;
 121         struct tty_log_buf data;
 122         int direction;
 123
 124         if(fd == tty_log_fd){
 125                 gettimeofday(&tv, NULL);
 126                 direction = is_read ? TTY_READ : TTY_WRITE;
 127                 data = ((struct tty_log_buf) { .what    = TTY_LOG_WRITE,
 128                                                .tty  = (unsigned long) tty,
 129                                                .len  = len,
 130                                                .direction = direction,
 131                                                .sec = tv.tv_sec,
 132                                                .usec = tv.tv_usec } );
 133                 os_write_file(tty_log_fd, &data, sizeof(data));
 134         }
 135
 136         return(log_chunk(fd, buf, len));
 137 }
 138
 139 void log_exec(char **argv, void *tty)
 140 {
 141         struct timeval tv;
 142         struct tty_log_buf data;
 143         char **ptr,*arg;
 144         int len;
 145
 146         if(tty_log_fd == -1) return;
 147
 148         gettimeofday(&tv, NULL);
 149
 150         len = 0;
 151         for(ptr = argv; ; ptr++){
 152                 if(copy_from_user_proc(&arg, ptr, sizeof(arg)))
 153                         return;
 154                 if(arg == NULL) break;
 155                 len += strlen_user_proc(arg);
 156         }
 157
 158         data = ((struct tty_log_buf) { .what    = TTY_LOG_EXEC,
 159                                        .tty  = (unsigned long) tty,
 160                                        .len  = len,
 161                                        .direction = 0,
 162                                        .sec = tv.tv_sec,
 163                                        .usec = tv.tv_usec } );
 164         os_write_file(tty_log_fd, &data, sizeof(data));
 165
 166         for(ptr = argv; ; ptr++){
 167                 if(copy_from_user_proc(&arg, ptr, sizeof(arg)))
 168                         return;
 169                 if(arg == NULL) break;
 170                 log_chunk(tty_log_fd, arg, strlen_user_proc(arg));
 171         }
 172 }
 173
 174 extern void register_tty_logger(int (*opener)(void *, void *),
 175                                 int (*writer)(int, const char *, int,
 176                                               void *, int),
 177                                 void (*closer)(int, void *));
 178
 179 static int register_logger(void)
 180 {
 181         register_tty_logger(open_tty_log, write_tty_log, close_tty_log);
 182         return(0);
 183 }
 184
 185 __uml_initcall(register_logger);
 186
 187 static int __init set_tty_log_dir(char *name, int *add)
 188 {
 189         tty_log_dir = name;
 190         return 0;
 191 }
 192
 193 __uml_setup("tty_log_dir=", set_tty_log_dir,
 194 "tty_log_dir=<directory>\n"
 195 "    This is used to specify the directory where the logs of all pty\n"
 196 "    data from this UML machine will be written.\n\n"
 197 );
 198
 199 static int __init set_tty_log_fd(char *name, int *add)
 200 {
 201         char *end;
 202
 203         tty_log_fd = strtoul(name, &end, 0);
 204         if((*end != '\0') || (end == name)){
 205                 printf("set_tty_log_fd - strtoul failed on '%s'\n", name);
 206                 tty_log_fd = -1;
 207         }
 208
 209         *add = 0;
 210         return 0;
 211 }
 212
 213 __uml_setup("tty_log_fd=", set_tty_log_fd,
 214 "tty_log_fd=<fd>\n"
 215 "    This is used to specify a preconfigured file descriptor to which all\n"
 216 "    tty data will be written.  Preconfigure the descriptor with something\n"
 217 "    like '10>tty_log tty_log_fd=10'.\n\n"
 218 );
 219
 220
 221 /*
 222  * Overrides for Emacs so that we follow Linus's tabbing style.
 223  * Emacs will notice this stuff at the end of the file and automatically
 224  * adjust the settings for this buffer only.  This must remain at the end
 225  * of the file.
 226  * ---------------------------------------------------------------------------
 227  * Local variables:
 228  * c-file-style: "linux"
 229  * End:
 230  */