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IP_PKTINFO #519

Closed
#522
Closed
IP_PKTINFO#519
#522
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Mistuke

Description

@kazu-yamamoto
kazu-yamamoto
opened on Dec 24, 2021

On Unix:

data IPv4PktInfo = IPv4PktInfo Int HostAddress HostAddress deriving (Eq)

On Windows:

data IPv4PktInfo = IPv4PktInfo ULONG HostAddress deriving (Eq)

This difference makes cross-platform usage impossible.

On Unix, in_pktinfo is defined as follows:

struct in_pktinfo {
    unsigned int   ipi_ifindex;  /* Interface index */
    struct in_addr ipi_spec_dst; /* Local address */
    struct in_addr ipi_addr;     /* Header Destination address */
};

Activity

  1. kazu-yamamoto
    assigned
    Mistuke
    on Dec 24, 2021

  2. kazu-yamamoto commented on Dec 24, 2021

    @kazu-yamamoto
    kazu-yamamoto
    on Dec 24, 2021
    CollaboratorAuthor
    • Would you tell me the definition of struct in_pktinfo on Windows?
    • Can we replace ULONG with Int?

  3. Mistuke commented on Dec 24, 2021

    @Mistuke
    Mistuke
    on Dec 24, 2021
    Collaborator
    • Would you tell me the definition of struct in_pktinfo on Windows?

    Definition is

    typedef struct in_pktinfo {
  IN_ADDR ipi_addr;
  ULONG   ipi_ifindex;
} IN_PKTINFO, *PIN_PKTINFO;
    • Can we replace ULONG with Int?

    Windows is IL32P64 so this ULONG is 32-bits. however you have the signed vs unsigned mismatch here. I guess it could be Int as you probably won't have more than 2^30 interfaces assuming they are numbered sequentially.

  4. kazu-yamamoto
    closed this as completedin #522on Jan 18, 2022
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