770265ee80
- Add FLAG_DONT_FRAGMENT flag and cli_handle_dont_fragment handler - Register -M/--dont-fragment option in the X-macro option table - Apply DF bit via icmp_set_dont_fragment() before ping loop - Expand error output: table-driven ICMP error messages and dedicated frag-needed output with next-hop MTU - Add STATIC_ARRAY_FOREACH / COUNT_OF macros to compiler.h
89 lines
2.2 KiB
C
89 lines
2.2 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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// TODO: CLEAN THIS FILE !
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/* Forward declarations */
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static void output_frag_needed(const char *from, uint16_t seq,
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uint16_t next_mtu);
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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 (ICMP_TYPE_DEST_UNREACHABLE == reply->type
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&& ICMP_CODE_FRAG_NEEDED == reply->code)
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output_frag_needed(from_str, seq, offending->next_mtu);
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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, error_msg_for(reply));
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}
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static void
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output_frag_needed(const char *from, uint16_t seq, uint16_t next_mtu)
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{
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if (next_mtu > 0)
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dprintf(STDERR_FILENO,
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"From %s: icmp_seq=%u Frag needed and DF set (mtu = %u)\n",
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from, (unsigned int)seq, (unsigned int)next_mtu);
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else
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dprintf(STDERR_FILENO,
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"From %s: icmp_seq=%u Frag needed and DF set (mtu unknown)\n",
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from, (unsigned int)seq);
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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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static const struct s_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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} error_table[] = {
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{
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ICMP_TYPE_TIME_EXCEEDED, ICMP_CODE_TTL_EXCEEDED,
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"Time to live exceeded"
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},
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{
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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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},
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{
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ICMP_TYPE_DEST_UNREACHABLE, ICMP_CODE_NET_UNREACHABLE,
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"Destination Net Unreachable"
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},
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{
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ICMP_TYPE_DEST_UNREACHABLE, ICMP_CODE_HOST_UNREACHABLE,
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"Destination Host Unreachable"
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},
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{
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ICMP_TYPE_DEST_UNREACHABLE, ICMP_CODE_PROTOCOL_UNREACHABLE,
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"Destination Protocol Unreachable"
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},
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{
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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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};
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const struct s_error_entry *entry;
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STATIC_ARRAY_FOREACH(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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