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
|
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <ctype.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <linux/if.h>
#include <linux/sockios.h>
#include <arpa/inet.h>
static void die(const char *s)
{
fprintf(stderr,"error: %s (%s)\n", s, strerror(errno));
exit(-1);
}
static void setflags(int s, struct ifreq *ifr, int set, int clr)
{
if(ioctl(s, SIOCGIFFLAGS, ifr) < 0) die("SIOCGIFFLAGS");
ifr->ifr_flags = (ifr->ifr_flags & (~clr)) | set;
if(ioctl(s, SIOCSIFFLAGS, ifr) < 0) die("SIOCSIFFLAGS");
}
static inline void init_sockaddr_in(struct sockaddr_in *sin, const char *addr)
{
sin->sin_family = AF_INET;
sin->sin_port = 0;
sin->sin_addr.s_addr = inet_addr(addr);
}
static void setmtu(int s, struct ifreq *ifr, const char *mtu)
{
int m = atoi(mtu);
ifr->ifr_mtu = m;
if(ioctl(s, SIOCSIFMTU, ifr) < 0) die("SIOCSIFMTU");
}
static void setdstaddr(int s, struct ifreq *ifr, const char *addr)
{
init_sockaddr_in((struct sockaddr_in *) &ifr->ifr_dstaddr, addr);
if(ioctl(s, SIOCSIFDSTADDR, ifr) < 0) die("SIOCSIFDSTADDR");
}
static void setnetmask(int s, struct ifreq *ifr, const char *addr)
{
init_sockaddr_in((struct sockaddr_in *) &ifr->ifr_netmask, addr);
if(ioctl(s, SIOCSIFNETMASK, ifr) < 0) die("SIOCSIFNETMASK");
}
static void setaddr(int s, struct ifreq *ifr, const char *addr)
{
init_sockaddr_in((struct sockaddr_in *) &ifr->ifr_addr, addr);
if(ioctl(s, SIOCSIFADDR, ifr) < 0) die("SIOCSIFADDR");
}
int ifconfig_main(int argc, char *argv[])
{
struct ifreq ifr;
int s;
unsigned int flags;
char astring[20];
char mstring[20];
char *updown, *brdcst, *loopbk, *ppp, *running, *multi;
argc--;
argv++;
if(argc == 0) return 0;
memset(&ifr, 0, sizeof(struct ifreq));
strncpy(ifr.ifr_name, argv[0], IFNAMSIZ);
ifr.ifr_name[IFNAMSIZ-1] = 0;
argc--, argv++;
if((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
die("cannot open control socket\n");
}
if (argc == 0) {
if (ioctl(s, SIOCGIFADDR, &ifr) < 0) {
perror(ifr.ifr_name);
return -1;
} else
strlcpy(astring,
inet_ntoa(((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr),
sizeof(astring));
if (ioctl(s, SIOCGIFNETMASK, &ifr) < 0) {
perror(ifr.ifr_name);
return -1;
} else
strlcpy(mstring,
inet_ntoa(((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr),
sizeof(mstring));
if (ioctl(s, SIOCGIFFLAGS, &ifr) < 0) {
perror(ifr.ifr_name);
return -1;
} else
flags = ifr.ifr_flags;
printf("%s: ip %s mask %s flags [", ifr.ifr_name,
astring,
mstring
);
updown = (flags & IFF_UP) ? "up" : "down";
brdcst = (flags & IFF_BROADCAST) ? " broadcast" : "";
loopbk = (flags & IFF_LOOPBACK) ? " loopback" : "";
ppp = (flags & IFF_POINTOPOINT) ? " point-to-point" : "";
running = (flags & IFF_RUNNING) ? " running" : "";
multi = (flags & IFF_MULTICAST) ? " multicast" : "";
printf("%s%s%s%s%s%s]\n", updown, brdcst, loopbk, ppp, running, multi);
return 0;
}
while(argc > 0) {
if (!strcmp(argv[0], "up")) {
setflags(s, &ifr, IFF_UP, 0);
} else if (!strcmp(argv[0], "mtu")) {
argc--, argv++;
if (!argc) {
errno = EINVAL;
die("expecting a value for parameter \"mtu\"");
}
setmtu(s, &ifr, argv[0]);
} else if (!strcmp(argv[0], "-pointopoint")) {
setflags(s, &ifr, IFF_POINTOPOINT, 1);
} else if (!strcmp(argv[0], "pointopoint")) {
argc--, argv++;
if (!argc) {
errno = EINVAL;
die("expecting an IP address for parameter \"pointtopoint\"");
}
setdstaddr(s, &ifr, argv[0]);
setflags(s, &ifr, IFF_POINTOPOINT, 0);
} else if (!strcmp(argv[0], "down")) {
setflags(s, &ifr, 0, IFF_UP);
} else if (!strcmp(argv[0], "netmask")) {
argc--, argv++;
if (!argc) {
errno = EINVAL;
die("expecting an IP address for parameter \"netmask\"");
}
setnetmask(s, &ifr, argv[0]);
} else if (isdigit(argv[0][0])) {
setaddr(s, &ifr, argv[0]);
setflags(s, &ifr, IFF_UP, 0);
}
argc--, argv++;
}
return 0;
}
|
