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udp example:Optimization udp example with recv_msg

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xueyunfei 2022-04-27 17:25:11 +08:00 committed by BOT
parent 18ee6fdbd4
commit 563639ba01
2 changed files with 39 additions and 4 deletions
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1
examples/protocols/sockets/udp_server/README.md
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@ -12,6 +12,7 @@ In order to create UDP client that communicates with UDP server example, choose
There are many host-side tools which can be used to interact with the UDP/TCP server/client.
One command line tool is [netcat](http://netcat.sourceforge.net) which can send and receive many kinds of packets.
Note: please replace `192.168.0.167 3333` with desired IPV4/IPV6 address (displayed in monitor console) and port number in the following commands.
If want to use this RECVINFO function, please enable LWIP_NETBUF_RECVINFO in menuconfig,this function can only resolve the destination address of IPV4.
In addition to those tools, simple Python scripts can be found under sockets/scripts directory. Every script is designed to interact with one of the examples.

42
examples/protocols/sockets/udp_server/main/udp_server.c
View File

@ -57,6 +57,11 @@ static void udp_server_task(void *pvParameters)
}
ESP_LOGI(TAG, "Socket created");
#if defined(CONFIG_LWIP_NETBUF_RECVINFO) && !defined(CONFIG_EXAMPLE_IPV6)
int enable = 1;
lwip_setsockopt(sock, IPPROTO_IP, IP_PKTINFO, &enable, sizeof(enable));
#endif
#if defined(CONFIG_EXAMPLE_IPV4) && defined(CONFIG_EXAMPLE_IPV6)
if (addr_family == AF_INET6) {
// Note that by default IPV6 binds to both protocols, it is must be disabled
@ -73,13 +78,33 @@ static void udp_server_task(void *pvParameters)
}
ESP_LOGI(TAG, "Socket bound, port %d", PORT);
struct sockaddr_storage source_addr; // Large enough for both IPv4 or IPv6
socklen_t socklen = sizeof(source_addr);
#if defined(CONFIG_LWIP_NETBUF_RECVINFO) && !defined(CONFIG_EXAMPLE_IPV6)
struct iovec iov;
struct msghdr msg;
struct cmsghdr *cmsgtmp;
u8_t cmsg_buf[CMSG_SPACE(sizeof(struct in_pktinfo))];
iov.iov_base = rx_buffer;
iov.iov_len = sizeof(rx_buffer);
msg.msg_control = cmsg_buf;
msg.msg_controllen = sizeof(cmsg_buf);
msg.msg_flags = 0;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_name = (struct sockaddr *)&source_addr;
msg.msg_namelen = socklen;
#endif
while (1) {
ESP_LOGI(TAG, "Waiting for data");
struct sockaddr_storage source_addr; // Large enough for both IPv4 or IPv6
socklen_t socklen = sizeof(source_addr);
#if defined(CONFIG_LWIP_NETBUF_RECVINFO) && !defined(CONFIG_EXAMPLE_IPV6)
int len = recvmsg(sock, &msg, 0);
#else
int len = recvfrom(sock, rx_buffer, sizeof(rx_buffer) - 1, 0, (struct sockaddr *)&source_addr, &socklen);
#endif
// Error occurred during receiving
if (len < 0) {
ESP_LOGE(TAG, "recvfrom failed: errno %d", errno);
@ -90,6 +115,15 @@ static void udp_server_task(void *pvParameters)
// Get the sender's ip address as string
if (source_addr.ss_family == PF_INET) {
inet_ntoa_r(((struct sockaddr_in *)&source_addr)->sin_addr, addr_str, sizeof(addr_str) - 1);
#if defined(CONFIG_LWIP_NETBUF_RECVINFO) && !defined(CONFIG_EXAMPLE_IPV6)
for ( cmsgtmp = CMSG_FIRSTHDR(&msg); cmsgtmp != NULL; cmsgtmp = CMSG_NXTHDR(&msg, cmsgtmp) ) {
if ( cmsgtmp->cmsg_level == IPPROTO_IP && cmsgtmp->cmsg_type == IP_PKTINFO ) {
struct in_pktinfo *pktinfo;
pktinfo = (struct in_pktinfo*)CMSG_DATA(cmsgtmp);
ESP_LOGI(TAG, "dest ip: %s\n", inet_ntoa(pktinfo->ipi_addr));
}
}
#endif
} else if (source_addr.ss_family == PF_INET6) {
inet6_ntoa_r(((struct sockaddr_in6 *)&source_addr)->sin6_addr, addr_str, sizeof(addr_str) - 1);
}