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Consolidate raw socket acquisition.

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dmiller
2025-06-30 19:24:32 +00:00
parent fc71b7544d
commit 67a796844f
16 changed files with 162 additions and 207 deletions
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28
libnetutil/netutil.h
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@@ -305,6 +305,34 @@ int netutil_eth_can_send(const netutil_eth_t *e);
/* See the description for eth_open_cached */
void eth_close_cached();
/* Create a raw socket and do things that always apply to raw sockets:
* Set SO_BROADCAST.
* Set IP_HDRINCL.
* Bind to an interface with SO_BINDTODEVICE (if device is not NULL).
The socket is created with address family AF_INET, but may be usable for
AF_INET6, depending on the operating system. */
int netutil_raw_socket(const char *device);
/* How should we send raw IP packets? Nmap can generally use either
ethernet or raw ip sockets. Which is better depends on platform
and goals. A _STRONG preference means that Nmap should use the
preferred method whenever it is possible (obviously it isn't
always possible -- sending ethernet frames won't work over a PPP
connection). This is useful when the other type doesn't work at
all. A _WEAK preference means that Nmap may use the other type
where it is substantially more efficient to do so. For example,
Nmap will still do an ARP ping scan of a local network even when
the pref is SEND_IP_WEAK */
#define PACKET_SEND_NOPREF 0x01
#define PACKET_SEND_ETH_WEAK 0x02
#define PACKET_SEND_ETH_STRONG 0x04
#define PACKET_SEND_ETH (PACKET_SEND_ETH_WEAK | PACKET_SEND_ETH_STRONG)
#define PACKET_SEND_IP_WEAK 0x08
#define PACKET_SEND_IP_STRONG 0x10
#define PACKET_SEND_IP (PACKET_SEND_IP_WEAK | PACKET_SEND_IP_STRONG)
int raw_socket_or_eth(int sendpref, const char *ifname,
int *rawsd, netutil_eth_t **ethsd);
/* Takes a protocol number like IPPROTO_TCP, IPPROTO_UDP, or
* IPPROTO_IP and returns a ascii representation (or "unknown" if it
* doesn't recognize the number). Returned string is in lowercase. */