Zilog EZ80F91AZA - Manual (Page 66)

Creating SSL Applications UM020107-1211
60
ZTP Network Security SSL Plug-In
User Manual
Client Applications
This section presents steps that a ZTP TCP client process uses to create a TCP connection,
and shows the modification required to use the SSL layer.
Observe the following procedure to establish a TCP-SSL connection in client mode:
1. To open a TCP/SSL client, a TCP client application in ZTP uses the connect() API
to request a connection to a specific remote server. For example:
INT16 sockfd;
UINT32 dstipaddr;
struct sockaddr_in server;
struct sockaddr_in client;
sockfd = socket(AF_INET, SOCK_STREAM, 0);
dstipaddr = name2ip("172.16.6.204");
server.sin_addr.s_addr = intel(dstipaddr);
server.sin_family = AF_INET;
server.sin_port = intel16(0x1234);
connect(sockfd, (struct sockaddr *)&server, sizeof(struct
sockaddr) );
This API opens the TCP socket and requests a TCP connection to port 0x1234 on the
remote device on which the IP address is 172.16.6.204. If the connection is success-
fully established,
sockfd will reference the TCP socket dedicated to this connection.
If the connection fails, connect() returns a negative value. To create an SSL connec-
tion socket in client mode, the connect() call is modified, as shown in the following
code fragment:
INT16 sockfd;
UINT32 dstipaddr;
struct sockaddr_in server;
struct sockaddr_in client;
sockfd = socket(AF_INET, SOCK_SSL, 0);
dstipaddr = name2ip("172.16.6.204");
server.sin_addr.s_addr = intel(dstipaddr);
server.sin_family = AF_INET;
server.sin_port = intel16(0x1234);
connect(sockfd, (struct sockaddr *)&server, sizeof(struct
sockaddr) );