89 lines
2.2 KiB
C
89 lines
2.2 KiB
C
#ifndef ICMP_H
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#define ICMP_H
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#include <stdint.h>
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#include <stddef.h>
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#include <netinet/in.h>
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#include <sys/types.h>
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#include <time.h>
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/* Opaque handle type */
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typedef struct icmp_handle icmp_handle_t;
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/* Reply structure passed to callback */
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typedef struct icmp_reply {
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uint8_t type;
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uint8_t code;
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struct in_addr from;
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uint8_t ttl;
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struct timespec timestamp;
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void *payload;
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size_t payload_len;
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void *ip_payload;
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size_t ip_payload_len;
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} icmp_reply_t;
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/* Offending packet structure for error messages */
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typedef struct icmp_offending_packet {
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struct in_addr src;
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struct in_addr dst;
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uint8_t protocol;
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uint8_t icmp_type;
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uint8_t icmp_code;
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uint16_t next_mtu; /* MTU from outer ICMP (type=3, code=4) */
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union {
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struct {
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uint16_t id;
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uint16_t seq;
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} echo;
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uint32_t gateway;
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struct {
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uint16_t unused;
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uint16_t mtu;
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} frag;
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uint8_t raw[4];
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} rest;
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} icmp_offending_packet_t;
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/* Callback type for received packets */
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typedef void (*icmp_callback_t)(const icmp_reply_t *reply, void *userdata);
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/* Handle lifecycle */
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icmp_handle_t *icmp_create(void);
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icmp_handle_t *icmp_create_block(void);
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void icmp_destroy(icmp_handle_t *h);
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int icmp_get_fd(const icmp_handle_t *h);
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/* Send functions */
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int icmp_send_raw(icmp_handle_t *h, uint8_t type, uint8_t code,
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uint32_t header_rest, const void *payload, size_t len,
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struct in_addr dest, uint8_t ttl);
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int icmp_send_echo(icmp_handle_t *h, struct in_addr dest, uint16_t id,
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uint16_t seq, uint8_t ttl, const void *payload, size_t payload_len);
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/* Receive function */
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int icmp_process(icmp_handle_t *h, icmp_callback_t cb, void *userdata,
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size_t max_packets);
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/* ID/Sequence helpers */
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int icmp_reply_id_seq(const icmp_reply_t *reply, uint16_t *id,
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uint16_t *seq);
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/* Error message helpers */
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int icmp_error_extract_offending(const icmp_reply_t *reply,
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icmp_offending_packet_t *offending);
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/* Socket options */
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int icmp_set_dont_fragment(icmp_handle_t *h);
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/* Error handling */
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const char *icmp_strerror(const icmp_handle_t *h);
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int icmp_should_retry(const icmp_handle_t *h);
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/* Time helpers */
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int icmp_get_time(struct timespec *ts);
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int64_t icmp_time_diff_ns(const struct timespec *start,
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const struct timespec *end);
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#endif
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