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The low-level format of the addresses are different depending on the mode of communication you have chosen. A function is provided by each of the lower layers to map a user-friendly string-form address to the binary form required by the lower layers.

    void *cs_straddr(COMSTACK handle, const char *str);

The format for TCP/IP and SSL addresses is:

    <host> [ ':' <portnum> ]

The hostname can be either a domain name or an IP address. The port number, if omitted, defaults to 210.

For TCP/IP and SSL transport modes, the special hostname "@" is mapped to any local address (the manifest constant INADDR_ANY). It is used to establish local listening endpoints in the server role.

For UNIX sockets, the format of an address is the socket filename.

When a connection has been established, you can use

    char *cs_addrstr(COMSTACK h);

to retrieve the host name of the peer system. The function returns a pointer to a static area, which is overwritten on the next call to the function.

A fairly recent addition to the COMSTACK module is the utility function

    COMSTACK cs_create_host (const char *str, int blocking, void **vp);

which is just a wrapper for cs_create and cs_straddr. The str is similar to that described for cs_straddr but with a prefix denoting the COMSTACK type. Prefixes supported are tcp:, unix: and ssl: for TCP/IP, UNIX and SSL respectively. If no prefix is given, then TCP/IP is used. The blocking is passed to function cs_create. The third parameter vp is a pointer to COMSTACK stack type specific values. For SSL (ssl_type) vp is an already create OpenSSL CTX. For TCP/IP and UNIX vp is unused (can be set to NULL.