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
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
|
http://openwall.info/wiki/people/segoon/ping
--- iputils-s20101006/ping.c
+++ iputils-s20101006/ping.c
@@ -88,6 +88,7 @@ struct sockaddr_in whereto; /* who to pi
int optlen = 0;
int settos = 0; /* Set TOS, Precendence or other QOS options */
int icmp_sock; /* socket file descriptor */
+int using_ping_socket = 0;
u_char outpack[0x10000];
int maxpacket = sizeof(outpack);
@@ -123,7 +124,11 @@ main(int argc, char **argv)
char *target, hnamebuf[MAX_HOSTNAMELEN];
char rspace[3 + 4 * NROUTES + 1]; /* record route space */
- icmp_sock = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
+ icmp_sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_ICMP);
+ if (icmp_sock != -1)
+ using_ping_socket = 1;
+ else
+ icmp_sock = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
socket_errno = errno;
uid = getuid();
@@ -377,13 +382,35 @@ main(int argc, char **argv)
}
}
- if ((options&F_STRICTSOURCE) &&
- bind(icmp_sock, (struct sockaddr*)&source, sizeof(source)) == -1) {
- perror("bind");
- exit(2);
+ if (!using_ping_socket) {
+ if ((options&F_STRICTSOURCE) &&
+ bind(icmp_sock, (struct sockaddr*)&source, sizeof(source)) == -1) {
+ perror("bind");
+ exit(2);
+ }
+ } else {
+ struct sockaddr_in sa;
+ socklen_t sl;
+
+ sa.sin_family = AF_INET;
+ sa.sin_port = 0;
+ sa.sin_addr.s_addr = (options&F_STRICTSOURCE) ?
+ source.sin_addr.s_addr : 0;
+ sl = sizeof(sa);
+
+ if (bind(icmp_sock, (struct sockaddr *) &sa, sl) == -1) {
+ perror("bind");
+ exit(2);
+ }
+
+ if (getsockname(icmp_sock, (struct sockaddr *) &sa, &sl) == -1) {
+ perror("getsockname");
+ exit(2);
+ }
+ ident = sa.sin_port;
}
- if (1) {
+ if (!using_ping_socket) {
struct icmp_filter filt;
filt.data = ~((1<<ICMP_SOURCE_QUENCH)|
(1<<ICMP_DEST_UNREACH)|
@@ -398,6 +425,12 @@ main(int argc, char **argv)
hold = 1;
if (setsockopt(icmp_sock, SOL_IP, IP_RECVERR, (char *)&hold, sizeof(hold)))
fprintf(stderr, "WARNING: your kernel is veeery old. No problems.\n");
+ if (using_ping_socket) {
+ if (setsockopt(icmp_sock, SOL_IP, IP_RECVTTL, (char *)&hold, sizeof(hold)))
+ perror("WARNING: setsockopt(IP_RECVTTL)");
+ if (setsockopt(icmp_sock, SOL_IP, IP_RETOPTS, (char *)&hold, sizeof(hold)))
+ perror("WARNING: setsockopt(IP_RETOPTS)");
+ }
/* record route option */
if (options & F_RROUTE) {
@@ -566,6 +599,7 @@ int receive_error_msg()
nerrors++;
} else if (e->ee_origin == SO_EE_ORIGIN_ICMP) {
struct sockaddr_in *sin = (struct sockaddr_in*)(e+1);
+ int error_pkt;
if (res < sizeof(icmph) ||
target.sin_addr.s_addr != whereto.sin_addr.s_addr ||
@@ -576,9 +610,18 @@ int receive_error_msg()
goto out;
}
- acknowledge(ntohs(icmph.un.echo.sequence));
+ error_pkt = (e->ee_type != ICMP_REDIRECT &&
+ e->ee_type != ICMP_SOURCE_QUENCH);
+ if (error_pkt) {
+ acknowledge(ntohs(icmph.un.echo.sequence));
+ net_errors++;
+ nerrors++;
+ }
+ else {
+ saved_errno = 0;
+ }
- if (!working_recverr) {
+ if (!using_ping_socket && !working_recverr) {
struct icmp_filter filt;
working_recverr = 1;
/* OK, it works. Add stronger filter. */
@@ -589,15 +632,14 @@ int receive_error_msg()
perror("\rWARNING: setsockopt(ICMP_FILTER)");
}
- net_errors++;
- nerrors++;
if (options & F_QUIET)
goto out;
if (options & F_FLOOD) {
- write_stdout("\bE", 2);
+ if (error_pkt)
+ write_stdout("\bE", 2);
} else {
print_timestamp();
- printf("From %s icmp_seq=%u ", pr_addr(sin->sin_addr.s_addr), ntohs(icmph.un.echo.sequence));
+ printf("From %s: icmp_seq=%u ", pr_addr(sin->sin_addr.s_addr), ntohs(icmph.un.echo.sequence));
pr_icmph(e->ee_type, e->ee_code, e->ee_info, NULL);
fflush(stdout);
}
@@ -695,15 +737,41 @@ parse_reply(struct msghdr *msg, int cc,
struct iphdr *ip;
int hlen;
int csfailed;
+ struct cmsghdr *cmsg;
+ int ttl;
+ __u8 *opts;
+ int optlen;
/* Check the IP header */
ip = (struct iphdr *)buf;
- hlen = ip->ihl*4;
- if (cc < hlen + 8 || ip->ihl < 5) {
- if (options & F_VERBOSE)
- fprintf(stderr, "ping: packet too short (%d bytes) from %s\n", cc,
- pr_addr(from->sin_addr.s_addr));
- return 1;
+ if (!using_ping_socket) {
+ hlen = ip->ihl*4;
+ if (cc < hlen + 8 || ip->ihl < 5) {
+ if (options & F_VERBOSE)
+ fprintf(stderr, "ping: packet too short (%d bytes) from %s\n", cc,
+ pr_addr(from->sin_addr.s_addr));
+ return 1;
+ }
+ ttl = ip->ttl;
+ opts = buf + sizeof(struct iphdr);
+ optlen = hlen - sizeof(struct iphdr);
+ } else {
+ hlen = 0;
+ ttl = 0;
+ opts = buf;
+ optlen = 0;
+ for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
+ if (cmsg->cmsg_level != SOL_IP)
+ continue;
+ if (cmsg->cmsg_type == IP_TTL) {
+ if (cmsg->cmsg_len < sizeof(int))
+ continue;
+ ttl = *(int *) CMSG_DATA(cmsg);
+ } else if (cmsg->cmsg_type == IP_RETOPTS) {
+ opts = (__u8 *) CMSG_DATA(cmsg);
+ optlen = cmsg->cmsg_len;
+ }
+ }
}
/* Now the ICMP part */
@@ -716,7 +784,7 @@ parse_reply(struct msghdr *msg, int cc,
return 1; /* 'Twas not our ECHO */
if (gather_statistics((__u8*)icp, sizeof(*icp), cc,
ntohs(icp->un.echo.sequence),
- ip->ttl, 0, tv, pr_addr(from->sin_addr.s_addr),
+ ttl, 0, tv, pr_addr(from->sin_addr.s_addr),
pr_echo_reply))
return 0;
} else {
@@ -807,7 +875,7 @@ parse_reply(struct msghdr *msg, int cc,
}
if (!(options & F_FLOOD)) {
- pr_options(buf + sizeof(struct iphdr), hlen);
+ pr_options(opts, optlen + sizeof(struct iphdr));
if (options & F_AUDIBLE)
putchar('\a');
@@ -916,8 +984,7 @@ void pr_icmph(__u8 type, __u8 code, __u3
printf("Redirect, Bad Code: %d", code);
break;
}
- if (icp)
- printf("(New nexthop: %s)\n", pr_addr(icp->un.gateway));
+ printf("(New nexthop: %s)\n", pr_addr(icp ? icp->un.gateway : info));
if (icp && (options & F_VERBOSE))
pr_iph((struct iphdr*)(icp + 1));
break;
@@ -1217,7 +1284,7 @@ void install_filter(void)
insns
};
- if (once)
+ if (once || using_ping_socket)
return;
once = 1;
--- iputils-s20101006/ping_common.c
+++ iputils-s20101006/ping_common.c
@@ -515,7 +515,8 @@ void setup(int icmp_sock)
*p++ = i;
}
- ident = htons(getpid() & 0xFFFF);
+ if (!ident)
+ ident = htons(getpid() & 0xFFFF);
set_signal(SIGINT, sigexit);
set_signal(SIGALRM, sigexit);
|
GitWeb