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
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
|
/*-
* Copyright 1997 Sean Eric Fagan
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Sean Eric Fagan
* 4. Neither the name of the author may be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* The main module for truss. Surprisingly simple, but, then, the other
* files handle the bulk of the work. And, of course, the kernel has to
* do a lot of the work :).
*/
#include <sys/ptrace.h>
#include <err.h>
#include <signal.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <sysdecode.h>
#include <time.h>
#include <unistd.h>
#include "truss.h"
#include "extern.h"
#include "syscall.h"
static void
usage(void)
{
fprintf(stderr, "%s\n%s\n",
"usage: truss [-cfaedDHS] [-o file] [-s strsize] -p pid",
" truss [-cfaedDHS] [-o file] [-s strsize] command [args]");
exit(1);
}
int
main(int ac, char **av)
{
struct sigaction sa;
struct trussinfo *trussinfo;
char *fname;
char **command;
pid_t pid;
int c;
fname = NULL;
/* Initialize the trussinfo struct */
trussinfo = (struct trussinfo *)calloc(1, sizeof(struct trussinfo));
if (trussinfo == NULL)
errx(1, "calloc() failed");
pid = 0;
trussinfo->outfile = stderr;
trussinfo->strsize = 32;
trussinfo->curthread = NULL;
LIST_INIT(&trussinfo->proclist);
init_syscalls();
while ((c = getopt(ac, av, "p:o:facedDs:SH")) != -1) {
switch (c) {
case 'p': /* specified pid */
pid = atoi(optarg);
/* make sure i don't trace me */
if (pid == getpid()) {
errx(2, "attempt to grab self.");
}
break;
case 'f': /* Follow fork()'s */
trussinfo->flags |= FOLLOWFORKS;
break;
case 'a': /* Print execve() argument strings. */
trussinfo->flags |= EXECVEARGS;
break;
case 'c': /* Count number of system calls and time. */
trussinfo->flags |= (COUNTONLY | NOSIGS);
break;
case 'e': /* Print execve() environment strings. */
trussinfo->flags |= EXECVEENVS;
break;
case 'd': /* Absolute timestamps */
trussinfo->flags |= ABSOLUTETIMESTAMPS;
break;
case 'D': /* Relative timestamps */
trussinfo->flags |= RELATIVETIMESTAMPS;
break;
case 'o': /* Specified output file */
fname = optarg;
break;
case 's': /* Specified string size */
trussinfo->strsize = atoi(optarg);
break;
case 'S': /* Don't trace signals */
trussinfo->flags |= NOSIGS;
break;
case 'H':
trussinfo->flags |= DISPLAYTIDS;
break;
default:
usage();
}
}
ac -= optind; av += optind;
if ((pid == 0 && ac == 0) ||
(pid != 0 && ac != 0))
usage();
if (fname != NULL) { /* Use output file */
/*
* Set close-on-exec ('e'), so that the output file is not
* shared with the traced process.
*/
if ((trussinfo->outfile = fopen(fname, "we")) == NULL)
err(1, "cannot open %s", fname);
}
/*
* If truss starts the process itself, it will ignore some signals --
* they should be passed off to the process, which may or may not
* exit. If, however, we are examining an already-running process,
* then we restore the event mask on these same signals.
*/
if (pid == 0) {
/* Start a command ourselves */
command = av;
setup_and_wait(trussinfo, command);
signal(SIGINT, SIG_IGN);
signal(SIGTERM, SIG_IGN);
signal(SIGQUIT, SIG_IGN);
} else {
sa.sa_handler = restore_proc;
sa.sa_flags = 0;
sigemptyset(&sa.sa_mask);
sigaction(SIGINT, &sa, NULL);
sigaction(SIGQUIT, &sa, NULL);
sigaction(SIGTERM, &sa, NULL);
start_tracing(trussinfo, pid);
}
/*
* At this point, if we started the process, it is stopped waiting to
* be woken up, either in exit() or in execve().
*/
if (LIST_FIRST(&trussinfo->proclist)->abi == NULL) {
/*
* If we are not able to handle this ABI, detach from the
* process and exit. If we just created a new process to
* run a command, kill the new process rather than letting
* it run untraced.
*/
if (pid == 0)
kill(LIST_FIRST(&trussinfo->proclist)->pid, SIGKILL);
ptrace(PT_DETACH, LIST_FIRST(&trussinfo->proclist)->pid, NULL,
0);
return (1);
}
ptrace(PT_SYSCALL, LIST_FIRST(&trussinfo->proclist)->pid, (caddr_t)1,
0);
/*
* At this point, it's a simple loop, waiting for the process to
* stop, finding out why, printing out why, and then continuing it.
* All of the grunt work is done in the support routines.
*/
clock_gettime(CLOCK_REALTIME, &trussinfo->start_time);
eventloop(trussinfo);
if (trussinfo->flags & COUNTONLY)
print_summary(trussinfo);
fflush(trussinfo->outfile);
return (0);
}
|
