as Ian said:

• struct sockaddr *addr = (struct sockaddr *)&dst_addr; should be: struct sockaddr *addr = (struct sockaddr *)dst_addr;

• struct sockaddr *interlcal = (struct sockaddr *)&src_addr; should be struct sockaddr *interlcal = (struct sockaddr *)src_addr

• bind(sockfd, interlcal, sizeof(interlcal)); should be: bind(sockfd, interlcal, sizeof(*src_addr));

• (note: this didn't work but the binding one did) connect(sockfd, addr, sizeof(addr)); should be connect(sockfd, addr, sizeof(*dst_addr));

• Just adding this so I can help others see this more easily, and so this question can be answered