ping_common.h revision 313379eb6b9da55f7371adef39a92153a0707d4a 
1#include <stdio.h>
2#include <stdlib.h>
3#include <unistd.h>
4#include <time.h>
5#include <sys/param.h>
6#include <sys/socket.h>
7#include <linux/sockios.h>
8#include <sys/file.h>
9#include <sys/time.h>
10#include <sys/signal.h>
11#include <sys/ioctl.h>
12#include <net/if.h>
13#include <sys/uio.h>
14#include <sys/poll.h>
15#include <ctype.h>
16#include <errno.h>
17#include <string.h>
18#include <netdb.h>
19#include <setjmp.h>
20
21#ifdef CAPABILITIES
22#include <sys/prctl.h>
23#include <sys/capability.h>
24#endif
25
26#ifdef USE_IDN
27#include <locale.h>
28#include <idna.h>
29#endif
30
31#include <netinet/in.h>
32#include <arpa/inet.h>
33#include <linux/types.h>
34#include <linux/errqueue.h>
35
36#include "SNAPSHOT.h"
37
38#define	DEFDATALEN	(64 - 8)	/* default data length */
39
40#define	MAXWAIT		10		/* max seconds to wait for response */
41#define MININTERVAL	10		/* Minimal interpacket gap */
42#define MINUSERINTERVAL	200		/* Minimal allowed interval for non-root */
43
44#define SCHINT(a)	(((a) <= MININTERVAL) ? MININTERVAL : (a))
45
46/* various options */
47extern int options;
48#define	F_FLOOD		0x001
49#define	F_INTERVAL	0x002
50#define	F_NUMERIC	0x004
51#define	F_PINGFILLED	0x008
52#define	F_QUIET		0x010
53#define	F_RROUTE	0x020
54#define	F_SO_DEBUG	0x040
55#define	F_SO_DONTROUTE	0x080
56#define	F_VERBOSE	0x100
57#define	F_TIMESTAMP	0x200
58#define	F_FLOWINFO	0x200
59#define	F_SOURCEROUTE	0x400
60#define	F_TCLASS	0x400
61#define	F_FLOOD_POLL	0x800
62#define	F_LATENCY	0x1000
63#define	F_AUDIBLE	0x2000
64#define	F_ADAPTIVE	0x4000
65#define	F_STRICTSOURCE	0x8000
66#define F_NOLOOP	0x10000
67#define F_TTL		0x20000
68#define F_MARK		0x40000
69#define F_PTIMEOFDAY	0x80000
70#define F_OUTSTANDING	0x100000
71
72/*
73 * MAX_DUP_CHK is the number of bits in received table, i.e. the maximum
74 * number of received sequence numbers we can keep track of.
75 */
76#define	MAX_DUP_CHK	0x10000
77
78#if defined(__WORDSIZE) && __WORDSIZE == 64
79# define USE_BITMAP64
80#endif
81
82#ifdef USE_BITMAP64
83typedef __u64	bitmap_t;
84# define BITMAP_SHIFT	6
85#else
86typedef __u32	bitmap_t;
87# define BITMAP_SHIFT	5
88#endif
89
90#if ((MAX_DUP_CHK >> (BITMAP_SHIFT + 3)) << (BITMAP_SHIFT + 3)) != MAX_DUP_CHK
91# error Please MAX_DUP_CHK and/or BITMAP_SHIFT
92#endif
93
94struct rcvd_table {
95	bitmap_t bitmap[MAX_DUP_CHK / (sizeof(bitmap_t) * 8)];
96};
97
98extern struct rcvd_table rcvd_tbl;
99
100#define	A(bit)	(rcvd_tbl.bitmap[(bit) >> BITMAP_SHIFT])	/* identify word in array */
101#define	B(bit)	(((bitmap_t)1) << ((bit) & ((1 << BITMAP_SHIFT) - 1)))	/* identify bit in word */
102
103static inline void rcvd_set(__u16 seq)
104{
105	unsigned bit = seq % MAX_DUP_CHK;
106	A(bit) |= B(bit);
107}
108
109static inline void rcvd_clear(__u16 seq)
110{
111	unsigned bit = seq % MAX_DUP_CHK;
112	A(bit) &= ~B(bit);
113}
114
115static inline bitmap_t rcvd_test(__u16 seq)
116{
117	unsigned bit = seq % MAX_DUP_CHK;
118	return A(bit) & B(bit);
119}
120
121extern u_char outpack[];
122extern int maxpacket;
123
124extern int datalen;
125extern char *hostname;
126extern int uid;
127extern int ident;			/* process id to identify our packets */
128
129extern int sndbuf;
130extern int ttl;
131
132extern long npackets;			/* max packets to transmit */
133extern long nreceived;			/* # of packets we got back */
134extern long nrepeats;			/* number of duplicates */
135extern long ntransmitted;		/* sequence # for outbound packets = #sent */
136extern long nchecksum;			/* replies with bad checksum */
137extern long nerrors;			/* icmp errors */
138extern int interval;			/* interval between packets (msec) */
139extern int preload;
140extern int deadline;			/* time to die */
141extern int lingertime;
142extern struct timeval start_time, cur_time;
143extern volatile int exiting;
144extern volatile int status_snapshot;
145extern int confirm;
146extern int confirm_flag;
147extern int working_recverr;
148
149extern volatile int in_pr_addr;		/* pr_addr() is executing */
150extern jmp_buf pr_addr_jmp;
151
152#ifndef MSG_CONFIRM
153#define MSG_CONFIRM 0
154#endif
155
156
157/* timing */
158extern int timing;			/* flag to do timing */
159extern long tmin;			/* minimum round trip time */
160extern long tmax;			/* maximum round trip time */
161extern long long tsum;			/* sum of all times, for doing average */
162extern long long tsum2;
163extern int rtt;
164extern __u16 acked;
165extern int pipesize;
166
167#define COMMON_OPTIONS \
168case 'a': case 'U': case 'c': case 'd': \
169case 'f': case 'i': case 'w': case 'l': \
170case 'S': case 'n': case 'p': case 'q': \
171case 'r': case 's': case 'v': case 'L': \
172case 't': case 'A': case 'W': case 'B': case 'm': \
173case 'D': case 'O':
174
175#define COMMON_OPTSTR "h?VQ:I:M:aUc:dfi:w:l:S:np:qrs:vLt:AW:Bm:DO"
176
177/*
178 * Write to stdout
179 */
180static inline void write_stdout(const char *str, size_t len)
181{
182	size_t o = 0;
183	ssize_t cc;
184	do {
185		cc = write(STDOUT_FILENO, str + o, len - o);
186		o += cc;
187	} while (len > o || cc < 0);
188}
189
190/*
191 * tvsub --
192 *	Subtract 2 timeval structs:  out = out - in.  Out is assumed to
193 * be >= in.
194 */
195static inline void tvsub(struct timeval *out, struct timeval *in)
196{
197	if ((out->tv_usec -= in->tv_usec) < 0) {
198		--out->tv_sec;
199		out->tv_usec += 1000000;
200	}
201	out->tv_sec -= in->tv_sec;
202}
203
204static inline void set_signal(int signo, void (*handler)(int))
205{
206	struct sigaction sa;
207
208	memset(&sa, 0, sizeof(sa));
209
210	sa.sa_handler = (void (*)(int))handler;
211#ifdef SA_INTERRUPT
212	sa.sa_flags = SA_INTERRUPT;
213#endif
214	sigaction(signo, &sa, NULL);
215}
216
217extern int __schedule_exit(int next);
218
219static inline int schedule_exit(int next)
220{
221	if (npackets && ntransmitted >= npackets && !deadline)
222		next = __schedule_exit(next);
223	return next;
224}
225
226static inline int in_flight(void)
227{
228	__u16 diff = (__u16)ntransmitted - acked;
229	return (diff<=0x7FFF) ? diff : ntransmitted-nreceived-nerrors;
230}
231
232static inline void acknowledge(__u16 seq)
233{
234	__u16 diff = (__u16)ntransmitted - seq;
235	if (diff <= 0x7FFF) {
236		if ((int)diff+1 > pipesize)
237			pipesize = (int)diff+1;
238		if ((__s16)(seq - acked) > 0 ||
239		    (__u16)ntransmitted - acked > 0x7FFF)
240			acked = seq;
241	}
242}
243
244static inline void advance_ntransmitted(void)
245{
246	ntransmitted++;
247	/* Invalidate acked, if 16 bit seq overflows. */
248	if ((__u16)ntransmitted - acked > 0x7FFF)
249		acked = (__u16)ntransmitted + 1;
250}
251
252extern void limit_capabilities(void);
253static int enable_capability_raw(void);
254static int disable_capability_raw(void);
255static int enable_capability_admin(void);
256static int disable_capability_admin(void);
257#ifdef CAPABILITIES
258extern int modify_capability(cap_value_t, cap_flag_value_t);
259static inline int enable_capability_raw(void)		{ return modify_capability(CAP_NET_RAW,   CAP_SET);   };
260static inline int disable_capability_raw(void)		{ return modify_capability(CAP_NET_RAW,   CAP_CLEAR); };
261static inline int enable_capability_admin(void)		{ return modify_capability(CAP_NET_ADMIN, CAP_SET);   };
262static inline int disable_capability_admin(void)	{ return modify_capability(CAP_NET_ADMIN, CAP_CLEAR); };
263#else
264extern int modify_capability(int);
265static inline int enable_capability_raw(void)		{ return modify_capability(1); };
266static inline int disable_capability_raw(void)		{ return modify_capability(0); };
267static inline int enable_capability_admin(void)		{ return modify_capability(1); };
268static inline int disable_capability_admin(void)	{ return modify_capability(0); };
269#endif
270extern void drop_capabilities(void);
271
272extern int send_probe(void);
273extern int receive_error_msg(void);
274extern int parse_reply(struct msghdr *msg, int len, void *addr, struct timeval *);
275extern void install_filter(void);
276
277extern int pinger(void);
278extern void sock_setbufs(int icmp_sock, int alloc);
279extern void setup(int icmp_sock);
280extern void main_loop(int icmp_sock, __u8 *buf, int buflen) __attribute__((noreturn));
281extern void finish(void) __attribute__((noreturn));
282extern void status(void);
283extern void common_options(int ch);
284extern int gather_statistics(__u8 *ptr, int icmplen,
285			     int cc, __u16 seq, int hops,
286			     int csfailed, struct timeval *tv, char *from,
287			     void (*pr_reply)(__u8 *ptr, int cc));
288extern void print_timestamp(void);
289