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add recv and sendto addresses

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yrutschle 2021-05-16 15:08:33 +02:00
parent e678428334
commit 300e1916c3
1 changed files with 25 additions and 1 deletions
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26
echosrv.c
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@ -110,12 +110,32 @@ void tcp_echo(struct listen_endpoint* listen_socket)
} }
} }
void print_udp_xchange(int sockfd, struct sockaddr* addr, socklen_t addrlen)
{
struct addrinfo src_addrinfo, to_addrinfo;
char str_addr[NI_MAXHOST+1+NI_MAXSERV+1];
char str_addr2[NI_MAXHOST+1+NI_MAXSERV+1];
struct sockaddr_storage ss;
src_addrinfo.ai_addr = (struct sockaddr*)&ss;
src_addrinfo.ai_addrlen = sizeof(ss);
getsockname(sockfd, src_addrinfo.ai_addr, &src_addrinfo.ai_addrlen);
to_addrinfo.ai_addr = addr;
to_addrinfo.ai_addrlen = sizeof(*addr);
fprintf(stderr, "UDP local %s remote %s\n",
sprintaddr(str_addr, sizeof(str_addr), &src_addrinfo),
sprintaddr(str_addr2, sizeof(str_addr2), &to_addrinfo)
);
}
/* UDP echo server: receive packets, return them, forever. /* UDP echo server: receive packets, return them, forever.
* Prefix is added at each packet */ * Prefix is added at each packet */
void udp_echo(struct listen_endpoint* listen_socket) void udp_echo(struct listen_endpoint* listen_socket)
{ {
char data[65536]; char data[65536];
struct sockaddr src_addr; struct sockaddr src_addr, sock_name;
socklen_t addrlen; socklen_t addrlen;
memset(data, 0, sizeof(data)); memset(data, 0, sizeof(data));
@ -135,6 +155,10 @@ void udp_echo(struct listen_endpoint* listen_socket)
if (len < 0) { if (len < 0) {
perror("recvfrom"); perror("recvfrom");
} }
*(data + prefix_len + len) = 0;
fprintf(stderr, "%ld: %s\n", len, data + prefix_len);
print_udp_xchange(listen_socket->socketfd, &src_addr, addrlen);
int res = sendto(listen_socket->socketfd, int res = sendto(listen_socket->socketfd,
data, data,