38 lines
935 B
C
38 lines
935 B
C
#include "unp.h"
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void dg_echo(int, SA*, socklen_t);
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int main(int argc, char* argv[])
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{
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int sockfd;
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struct sockaddr_in servaddr, cliaddr;
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sockfd = Socket(AF_INET, SOCK_DGRAM, 0);
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bzero(&servaddr, sizeof(servaddr));
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servaddr.sin_family = AF_INET;
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servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
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servaddr.sin_port = htons(SERV_PORT);
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Bind(sockfd, (SA *)&servaddr, sizeof(servaddr));
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dg_echo(sockfd, (SA *)&cliaddr, sizeof(cliaddr));
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}
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void dg_echo(int sockfd, SA *pcliaddr, socklen_t clien)
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{
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int n;
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socklen_t len;
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char msg[MAXLINE];
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char res[MAXLINE];
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char greeting[] = "This is from server: ";
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for(;;) {
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len = clien;
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n = Recvfrom(sockfd, msg, MAXLINE, 0, pcliaddr, &len);
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strcpy(res, "");
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strncat(res, greeting, strlen(greeting));
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strncat(res, msg, n);
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Sendto(sockfd, res, strlen(res), 0, pcliaddr, len);
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}
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} |