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
|
/*
* Routine to provide information about the other side of a FD.
*
* Copyright (C) 2015 Peter Wu <peter@lekensteyn.nl>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
*/
#define _GNU_SOURCE /* for struct ucred on Linux */
#include "scope.h"
#include <unistd.h>
#include <stdio.h>
#include <sys/types.h> /* for pid_t */
#ifdef HAVE_GETPEERUCRED /* Solaris-derived systems */
#include <ucred.h>
#endif
#ifdef __sun
#include <procfs.h>
#endif
static pid_t
GetPidFromFd(FD fd)
{
#ifdef SO_PEERCRED
#ifndef __OpenBSD__
struct ucred cred;
#else
struct sockpeercred cred;
#endif
socklen_t cred_len = sizeof(cred);
if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &cred, &cred_len) == 0 &&
cred_len == sizeof(cred)) {
return cred.pid;
}
#elif defined(HAVE_GETPEERUCRED)
ucred_t *peercred = NULL;
if (getpeerucred(fd, &peercred) == 0) {
pid_t peerpid = ucred_getpid(peercred);
ucred_free(peercred);
if (peerpid != -1) {
return peerpid;
}
}
#endif
return 0;
}
static const char *
GetProcnameForPid(pid_t pid)
{
#ifdef __sun /* Solaris-derived /proc */
static char comm[PRARGSZ];
char path[32];
int totsize = 0;
int fd = 0;
psinfo_t psinfo = { 0 };
char *sp;
if (snprintf(path, sizeof(path), "/proc/%d/psinfo", pid) < 0)
return NULL;
fd = open(path, O_RDONLY);
if (fd < 0)
return NULL;
totsize = read(fd, &psinfo, sizeof(psinfo_t));
close(fd);
if (totsize <= 0)
return NULL;
/* pr_psargs is the first PRARGSZ (80) characters of the command
* line string - assume up to the first space is the command name,
* since it's not delimited. While there is also pr_fname, that's
* more limited, giving only the first 16 chars of the basename of
* the file that was exec'ed, thus cutting off many long gnome
* command names, or returning "isapython2.6" for all python scripts.
*/
psinfo.pr_psargs[PRARGSZ - 1] = '\0';
sp = strchr(psinfo.pr_psargs, ' ');
if (sp)
*sp = '\0';
strlcpy(comm, psinfo.pr_psargs, sizeof(comm));
return comm;
#else /* Linux-style /proc */
/* comm is no longer than TASK_COMM_LEN (16) */
static char comm[17];
char comm_path[32];
char comm_fd;
unsigned comm_len = 0;
snprintf(comm_path, sizeof(comm_path), "/proc/%d/comm", pid);
comm_fd = open(comm_path, O_RDONLY);
if (comm_fd != -1) {
comm_len = read(comm_fd, comm, sizeof(comm) - 1);
if (comm_len < 0)
comm_len = 0;
close(comm_fd);
}
if (comm_len > 0 && comm[comm_len - 1] == '\n')
comm_len--;
comm[comm_len] = '\0';
return comm;
#endif
}
/*
Retrieves additional information about the other side of the fd.
For Unix domain sockets, this results in the process ID and name.
*/
char *
ReadPeerInfo(FD fd)
{
/* should hold enough for "PID <number> <command name>" */
char peer_info[40];
unsigned pos;
pid_t pid;
const char *comm;
pid = GetPidFromFd(fd);
/* Use the fact that pid_t is the first field of struct ucred. */
if (pid) {
pos = snprintf(peer_info, sizeof(peer_info), "pid %d", pid);
comm = GetProcnameForPid(pid);
if (comm)
pos += snprintf(peer_info + pos, sizeof(peer_info) - pos,
" %s", comm);
return strdup(peer_info);
}
/* (Could add port number here for AF_INET if it helps.) */
return NULL;
}
|
