2 * netsniff-ng - the packet sniffing beast
3 * Copyright 2009, 2010 Daniel Borkmann.
4 * Subject to the GPL, version 2.
16 #include <sys/types.h>
18 #include <sys/types.h>
19 #include <sys/ioctl.h>
20 #include <sys/socket.h>
22 #include <linux/if_tun.h>
29 int open_or_die(const char *file
, int flags
)
31 int ret
= open(file
, flags
);
33 panic("Cannot open file %s! %s.\n", file
, strerror(errno
));
38 int open_or_die_m(const char *file
, int flags
, mode_t mode
)
40 int ret
= open(file
, flags
, mode
);
42 panic("Cannot open or create file %s! %s.", file
, strerror(errno
));
46 void create_or_die(const char *file
, mode_t mode
)
48 int fd
= open_or_die_m(file
, O_WRONLY
| O_CREAT
, mode
);
52 void pipe_or_die(int pipefd
[2], int flags
)
54 int ret
= pipe2(pipefd
, flags
);
56 panic("Cannot create pipe2 event fd! %s.\n", strerror(errno
));
59 int tun_open_or_die(char *name
, int type
)
66 panic("No name provided for tundev!\n");
68 fd
= open_or_die("/dev/net/tun", O_RDWR
);
70 memset(&ifr
, 0, sizeof(ifr
));
72 strlcpy(ifr
.ifr_name
, name
, IFNAMSIZ
);
74 ret
= ioctl(fd
, TUNSETIFF
, &ifr
);
76 panic("ioctl screwed up! %s.\n", strerror(errno
));
78 ret
= fcntl(fd
, F_SETFL
, fcntl(fd
, F_GETFL
) | O_NONBLOCK
);
80 panic("fctnl screwed up! %s.\n", strerror(errno
));
82 flags
= device_get_flags(name
);
83 flags
|= IFF_UP
| IFF_RUNNING
;
84 device_set_flags(name
, flags
);
89 ssize_t
read_or_die(int fd
, void *buf
, size_t len
)
91 ssize_t ret
= read(fd
, buf
, len
);
95 panic("Cannot read from descriptor! %s.\n", strerror(errno
));
101 ssize_t
write_or_die(int fd
, const void *buf
, size_t len
)
103 ssize_t ret
= write(fd
, buf
, len
);
107 panic("Cannot write to descriptor! %s.", strerror(errno
));
113 extern volatile sig_atomic_t sigint
;
115 ssize_t
read_exact(int fd
, void *buf
, size_t len
, int mayexit
)
117 ssize_t num
= 0, written
;
119 while (len
> 0 && !sigint
) {
120 if ((written
= read(fd
, buf
, len
)) < 0) {
121 if (errno
== EAGAIN
&& num
> 0)
138 ssize_t
write_exact(int fd
, void *buf
, size_t len
, int mayexit
)
140 ssize_t num
= 0, written
;
142 while (len
> 0 && !sigint
) {
143 if ((written
= write(fd
, buf
, len
)) < 0) {
144 if (errno
== EAGAIN
&& num
> 0)
161 static char const *priov
[] = {
162 [LOG_EMERG
] = "EMERG:",
163 [LOG_ALERT
] = "ALERT:",
164 [LOG_CRIT
] = "CRIT:",
166 [LOG_WARNING
] = "WARNING:",
167 [LOG_NOTICE
] = "NOTICE:",
168 [LOG_INFO
] = "INFO:",
169 [LOG_DEBUG
] = "DEBUG:",
172 static ssize_t
cookie_writer(void *cookie
, char const *data
, size_t leng
)
174 int prio
= LOG_DEBUG
, len
;
177 len
= strlen(priov
[prio
]);
178 } while (memcmp(data
, priov
[prio
], len
) && --prio
>= 0);
187 while (*data
== ' ') {
192 syslog(prio
, "%.*s", (int) leng
, data
);
197 static cookie_io_functions_t cookie_log
= {
198 .write
= cookie_writer
,
201 void to_std_log(FILE **fp
)
203 setvbuf(*fp
= fopencookie(NULL
, "w", cookie_log
), NULL
, _IOLBF
, 0);