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ping: Remove pr_retip()
Ping used to provide some sort of packet sniffing capabilities, this was in an era where hubs were used and tcpdump wasn't invented. pr_iph() is a function that prints the IP header of the packet. pr_retip() is essentially a wrapper function to pr_iph(), that also displays the source and destination ports of a TCP or UDP packet. Afteref9e6dc7ee
some of this functionality was almost removed, to only display packets sent by us (26+ years ago). At this point, reaching this code path was only possible by doctoring the original packet. After46d7b45a26
this code path can never be reached. Remove the code. Reviewed by: markj MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D38475
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20b4130314
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@ -227,7 +227,6 @@ static char *pr_ntime(n_time);
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static void pr_icmph(struct icmp *, struct ip *, const u_char *const);
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static void pr_iph(struct ip *, const u_char *);
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static void pr_pack(char *, ssize_t, struct sockaddr_in *, struct timespec *);
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static void pr_retip(struct ip *, const u_char *);
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static void status(int);
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static void stopit(int);
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@ -1571,11 +1570,11 @@ pr_icmph(struct icmp *icp, struct ip *oip, const u_char *const oicmp_raw)
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break;
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}
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/* Print returned IP header information */
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pr_retip(oip, oicmp_raw);
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pr_iph(oip, oicmp_raw);
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break;
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case ICMP_SOURCEQUENCH:
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(void)printf("Source Quench\n");
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pr_retip(oip, oicmp_raw);
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pr_iph(oip, oicmp_raw);
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break;
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case ICMP_REDIRECT:
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switch(icp->icmp_code) {
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@ -1596,7 +1595,7 @@ pr_icmph(struct icmp *icp, struct ip *oip, const u_char *const oicmp_raw)
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break;
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}
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(void)printf("(New addr: %s)\n", inet_ntoa(icp->icmp_gwaddr));
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pr_retip(oip, oicmp_raw);
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pr_iph(oip, oicmp_raw);
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break;
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case ICMP_ECHO:
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(void)printf("Echo Request\n");
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@ -1615,12 +1614,12 @@ pr_icmph(struct icmp *icp, struct ip *oip, const u_char *const oicmp_raw)
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icp->icmp_code);
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break;
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}
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pr_retip(oip, oicmp_raw);
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pr_iph(oip, oicmp_raw);
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break;
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case ICMP_PARAMPROB:
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(void)printf("Parameter problem: pointer = 0x%02x\n",
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icp->icmp_hun.ih_pptr);
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pr_retip(oip, oicmp_raw);
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pr_iph(oip, oicmp_raw);
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break;
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case ICMP_TSTAMP:
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(void)printf("Timestamp\n");
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@ -1712,28 +1711,6 @@ pr_addr(struct in_addr ina)
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return(buf);
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}
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/*
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* pr_retip --
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* Dump some info on a returned (via ICMP) IP packet.
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*/
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static void
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pr_retip(struct ip *ip, const u_char *cp)
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{
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int8_t hlen;
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pr_iph(ip, cp);
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hlen = ip->ip_hl << 2;
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cp = cp + hlen;
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if (ip->ip_p == 6)
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(void)printf("TCP: from port %u, to port %u (decimal)\n",
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(*cp * 256 + *(cp + 1)), (*(cp + 2) * 256 + *(cp + 3)));
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else if (ip->ip_p == 17)
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(void)printf("UDP: from port %u, to port %u (decimal)\n",
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(*cp * 256 + *(cp + 1)), (*(cp + 2) * 256 + *(cp + 3)));
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}
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static char *
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pr_ntime(n_time timestamp)
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{
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@ -920,6 +920,54 @@ def test_ping_46(self, expected):
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},
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id="_3_1_flags_DF",
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),
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pytest.param(
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{
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"src": "192.0.2.1",
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"dst": "192.0.2.2",
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"icmp_type": 3,
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"icmp_code": 1,
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"special": "tcp",
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},
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{
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"returncode": 2,
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"stdout": """\
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PATTERN: 0x01
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PING 192.0.2.2 (192.0.2.2): 56 data bytes
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--- 192.0.2.2 ping statistics ---
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1 packets transmitted, 0 packets received, 100.0% packet loss
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""",
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"stderr": """\
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ping: quoted data too short (40 bytes) from 192.0.2.2
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""",
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"redacted": False,
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},
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id="_3_1_special_tcp",
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),
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pytest.param(
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{
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"src": "192.0.2.1",
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"dst": "192.0.2.2",
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"icmp_type": 3,
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"icmp_code": 1,
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"special": "udp",
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},
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{
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"returncode": 2,
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"stdout": """\
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PATTERN: 0x01
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PING 192.0.2.2 (192.0.2.2): 56 data bytes
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--- 192.0.2.2 ping statistics ---
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1 packets transmitted, 0 packets received, 100.0% packet loss
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""",
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"stderr": """\
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ping: quoted data too short (28 bytes) from 192.0.2.2
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""",
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"redacted": False,
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},
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id="_3_1_special_udp",
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),
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]
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@pytest.mark.parametrize("pinger_kargs, expected", pinger_testdata)
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