NAME

       upscli_connect - Open a connection to a NUT upsd

SYNOPSIS

       #include <upsclient.h>

       int upscli_connect(UPSCONN_t *ups, const char *host, uint16_t port, int flags);

DESCRIPTION

       The upscli_connect() function takes the pointer ups to a UPSCONN_t state structure and opens a TCP
       connection to the host on the given port.

       flags may be either UPSCLI_CONN_TRYSSL to try a SSL connection, or UPSCLI_CONN_REQSSL to require a SSL
       connection.

       Introduced in version 2.7, an additional flag UPSCLI_CONN_CERTVERIF now exists to verify the signature
       offered during the SSL handshake. This flag should be used in conjunction with upscli_init(3) and/or
       upscli_add_host_cert(3) calls before connecting in order to define a CA certificate with which to verify.

       If SSL mode is required, this function will only return successfully if it is able to establish a SSL
       connection with the server. Possible reasons for failure include no SSL support on the server, and if
       upsclient itself hasn’t been compiled with SSL support.

       You must call upscli_disconnect(3) when finished with a connection, or your program will slowly leak
       memory and file descriptors.

RETURN VALUE

       The upscli_connect() function modifies the UPSCONN_t structure and returns 0 on success, or -1 if an
       error occurs.

SEE ALSO

       upscli_disconnect(3), upscli_fd(3), upscli_splitaddr(3), upscli_splitname(3), upscli_ssl(3),
       upscli_strerror(3), upscli_upserror(3)

Network UPS Tools 2.8.1                            03/31/2024                                  UPSCLI_CONNECT(3)