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< Networking | Ideas
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* port | * port | ||
* protocol | * protocol | ||
Current status: | |||
<pre> | |||
struct servent *getservbyname(const char *name, const char *proto); | |||
struct servent { | |||
char *s_name; /* official service name */ | |||
char **s_aliases; /* alias list */ | |||
int s_port; /* port number */ | |||
char *s_proto; /* protocol to use */ | |||
} | |||
</pre> | |||
=== Resolve an address for connect() or sendto() === | === Resolve an address for connect() or sendto() === |
Revision as of 17:49, 21 December 2012
Some ideas for name resolution in linux distributions
Resolve a host name to a list of network layer addresses
Input parameters:
- host
- family
Output parameters:
- List of sockaddr pointers (zero ports, zero protocols, etc)
- Canonical name (why?)
Unfortunately, gethostbyname() has been deprecated and getaddrinfo() is not a good alternative.
Resolve a service name to a port number
Input parameters:
- service
- protocol (socktype?)
Output parameter:
- port
- protocol
Current status:
struct servent *getservbyname(const char *name, const char *proto); struct servent { char *s_name; /* official service name */ char **s_aliases; /* alias list */ int s_port; /* port number */ char *s_proto; /* protocol to use */ }
Resolve an address for connect() or sendto()
Input parameters (network layer):
- host (IP address or some sort of host name)
- family (to implement -4 and -6 switches)
Input parameters (transport layer):
- socktype
- protocol
- service (TCP/UDP port number or service name)
- whether to use SRV records
Output parameters:
- List of sockaddr pointers
- Canonical name (why?)
- socktype
- protocol
Resolve an address for IP ACLs
Input parameters:
- host
- family
Output parameters:
- List of sockaddr pointers (zero ports, zero protocols, etc)
- Canonical name (why?)
How name resolution API should work
- *gethostinfo (name, family=0, flags=0) → list of sockaddr, canonical name
- *getservinfo (name, protocol=0, ?socktype=0) → port, protocol, ?socktype
- *getconninfo (host, service, family, socktype, protocol, flags) → list of sockaddr, ?socktype, ?protocol, canonical name