75 lines
2 KiB
C
75 lines
2 KiB
C
#include <stdio.h>
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#include <unistd.h>
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#include <arpa/inet.h>
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#include "compiler.h"
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#include "icmp.h"
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#include "icmp_types.h"
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#include "internal/ping/output.h"
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static const struct error_entry
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{
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uint8_t type;
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uint8_t code;
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const char *msg;
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} g_error_table[] = {
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{ ICMP_TYPE_TIME_EXCEEDED, ICMP_CODE_TTL_EXCEEDED,
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"Time to live exceeded" },
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{ ICMP_TYPE_TIME_EXCEEDED, ICMP_CODE_FRAG_REASM_EXCEEDED,
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"Frag reassembly time exceeded" },
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{ ICMP_TYPE_DEST_UNREACHABLE, ICMP_CODE_NET_UNREACHABLE,
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"Destination Net Unreachable" },
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{ ICMP_TYPE_DEST_UNREACHABLE, ICMP_CODE_HOST_UNREACHABLE,
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"Destination Host Unreachable" },
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{ ICMP_TYPE_DEST_UNREACHABLE, ICMP_CODE_PROTOCOL_UNREACHABLE,
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"Destination Protocol Unreachable" },
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{ ICMP_TYPE_DEST_UNREACHABLE, ICMP_CODE_PORT_UNREACHABLE,
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"Destination Port Unreachable" },
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};
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/* Forward declarations */
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static const char *error_msg_for(const icmp_reply_t *reply);
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/* -------------------- */
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void
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ping_output_error(const icmp_reply_t *reply,
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const icmp_offending_packet_t *offending,
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uint16_t seq, __unused const struct ping_config *config)
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{
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char from_str[INET_ADDRSTRLEN];
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inet_ntop(AF_INET, &reply->from, from_str, sizeof(from_str));
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if (reply->type == ICMP_TYPE_DEST_UNREACHABLE
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&& reply->code == ICMP_CODE_FRAG_NEEDED)
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{
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if (offending->next_mtu > 0)
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dprintf(STDERR_FILENO,
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"From %s: icmp_seq=%u "
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"Frag needed and DF set (mtu = %u)\n",
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from_str, (unsigned int)seq,
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(unsigned int)offending->next_mtu);
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else
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dprintf(STDERR_FILENO,
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"From %s: icmp_seq=%u "
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"Frag needed and DF set (mtu unknown)\n",
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from_str, (unsigned int)seq);
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}
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else
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dprintf(STDERR_FILENO, "From %s: icmp_seq=%u %s\n",
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from_str, (unsigned int)seq,
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error_msg_for(reply));
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}
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static const char *
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error_msg_for(const icmp_reply_t *reply)
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{
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const struct error_entry *entry;
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STATIC_ARRAY_FOREACH(g_error_table, entry)
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{
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if (entry->type == reply->type && entry->code == reply->code)
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return (entry->msg);
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}
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return ("Unknown ICMP error");
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}
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