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author | Franciszek Malinka <franciszek.malinka@gmail.com> | 2021-10-05 21:49:54 +0200 |
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committer | Franciszek Malinka <franciszek.malinka@gmail.com> | 2021-10-05 21:49:54 +0200 |
commit | c5fcf7179a83ef65c86c6a4a390029149e518649 (patch) | |
tree | d29ffc5b86a0d257453cedcf87d91a13d8bf3b0d /semestr-4/sieci/pracownia2/udp_server.c | |
parent | f8a88b6a4aba1f66d04711a9330eaba49a50c463 (diff) |
Duzy commit ze smieciami
Diffstat (limited to 'semestr-4/sieci/pracownia2/udp_server.c')
-rwxr-xr-x | semestr-4/sieci/pracownia2/udp_server.c | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/semestr-4/sieci/pracownia2/udp_server.c b/semestr-4/sieci/pracownia2/udp_server.c new file mode 100755 index 0000000..b5ae6d1 --- /dev/null +++ b/semestr-4/sieci/pracownia2/udp_server.c @@ -0,0 +1,59 @@ +#include <netinet/ip.h> +#include <arpa/inet.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <errno.h> + +int main() +{ + int sockfd = socket(AF_INET, SOCK_DGRAM, 0); + if (sockfd < 0) { + fprintf(stderr, "socket error: %s\n", strerror(errno)); + return EXIT_FAILURE; + } + + struct sockaddr_in server_address; + bzero (&server_address, sizeof(server_address)); + server_address.sin_family = AF_INET; + server_address.sin_port = htons(54321); + server_address.sin_addr.s_addr = htonl(INADDR_ANY); + if (bind (sockfd, (struct sockaddr*)&server_address, sizeof(server_address)) < 0) { + fprintf(stderr, "bind error: %s\n", strerror(errno)); + return EXIT_FAILURE; + } + + for (;;) { + + struct sockaddr_in sender; + socklen_t sender_len = sizeof(sender); + u_int8_t buffer[IP_MAXPACKET+1]; + + ssize_t datagram_len = recvfrom (sockfd, buffer, IP_MAXPACKET, 0, (struct sockaddr*)&sender, &sender_len); + if (datagram_len < 0) { + fprintf(stderr, "recvfrom error: %s\n", strerror(errno)); + return EXIT_FAILURE; + } + + char sender_ip_str[20]; + inet_ntop(AF_INET, &(sender.sin_addr), sender_ip_str, sizeof(sender_ip_str)); + printf ("Received UDP packet from IP address: %s, port: %d\n", sender_ip_str, ntohs(sender.sin_port)); + + buffer[datagram_len] = 0; + printf ("%ld-byte message: +%s+\n", datagram_len, buffer); + + char* reply = "Thank you!"; + ssize_t reply_len = strlen(reply); + if (sendto(sockfd, reply, reply_len, 0, (struct sockaddr*)&sender, sender_len) != reply_len) { + fprintf(stderr, "sendto error: %s\n", strerror(errno)); + return EXIT_FAILURE; + } + + fflush(stdout); + } + + close (sockfd); + return EXIT_SUCCESS; +} + |