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Better error handling for -s.

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Submitted by:	bde

Do not constantify maximum payload size. It is 65467 with -R
(record route), and 65507 without it.

Reviewed by:	silence on -net
Proposed by:	bde

I am going to MFC rev.1.77 - 1.81 ping.c and rev.1.39 and 1.40 ping.8:

MFC after:      6 months
This commit is contained in:
Maxim Konovalov 2003-01-23 13:04:42 +00:00
parent 261e59bb9e
commit fb7d32c7ee
2 changed files with 15 additions and 11 deletions
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2
sbin/ping/ping.8
View File

@ -235,7 +235,7 @@ data bytes when combined
with the 8 bytes of
.Tn ICMP
header data.
Only the super-user may use this option.
Only the super-user may specify values more than default.
.It Fl S Ar src_addr
Use the following IP address as the source address in outgoing packets.
On hosts with more than one IP address, this option can be used to

24
sbin/ping/ping.c
View File

@ -104,7 +104,6 @@ static const char rcsid[] =
#define MAXIPLEN (sizeof(struct ip) + MAX_IPOPTLEN)
#define MAXICMPLEN (ICMP_ADVLENMIN + MAX_IPOPTLEN)
#define MINICMPLEN ICMP_MINLEN
#define MAXPAYLOAD (IP_MAXPACKET - MAXIPLEN - MINICMPLEN)
#define MAXWAIT 10 /* max seconds to wait for response */
#define MAXALARM (60 * 60) /* max seconds for alarm timeout */
#define MAXTOS 255
@ -151,6 +150,7 @@ int mx_dup_ck = MAX_DUP_CHK;
char rcvd_tbl[MAX_DUP_CHK / 8];
struct sockaddr_in whereto; /* who to ping */
long maxpayload;
int datalen = DEFDATALEN;
int s; /* socket file descriptor */
u_char outpackhdr[IP_MAXPACKET], *outpack;
@ -351,18 +351,16 @@ main(argc, argv)
options |= F_SO_DONTROUTE;
break;
case 's': /* size of packet to send */
if (uid) {
errno = EPERM;
err(EX_NOPERM, "-s flag");
}
ultmp = strtoul(optarg, &ep, 0);
if (ultmp > MAXPAYLOAD)
errx(EX_USAGE,
"packet size too large: %lu > %u",
ultmp, MAXPAYLOAD);
if (*ep || ep == optarg)
errx(EX_USAGE, "invalid packet size: `%s'",
optarg);
if (uid != 0 && ultmp > DEFDATALEN) {
errno = EPERM;
err(EX_NOPERM,
"packet size too large: %lu > %u",
ultmp, DEFDATALEN);
}
datalen = ultmp;
break;
case 'S':
@ -418,6 +416,12 @@ main(argc, argv)
usage();
target = argv[optind];
maxpayload = IP_MAXPACKET - sizeof(struct ip) - MINICMPLEN;
if (options & F_RROUTE)
maxpayload -= MAX_IPOPTLEN;
if (datalen > maxpayload)
errx(EX_USAGE, "packet size too large: %lu > %u", datalen,
maxpayload);
if (source) {
bzero((char *)&sin, sizeof(sin));
sin.sin_family = AF_INET;
@ -1477,7 +1481,7 @@ fill(bp, patp)
&pat[13], &pat[14], &pat[15]);
if (ii > 0)
for (kk = 0; kk <= MAXPAYLOAD - (PHDR_LEN + ii); kk += ii)
for (kk = 0; kk <= maxpayload - (PHDR_LEN + ii); kk += ii)
for (jj = 0; jj < ii; ++jj)
bp[jj + kk] = pat[jj];
if (!(options & F_QUIET)) {