使用UDP进行文件传输的C程序

// server code for UDP socket programming#include #include #include #include #include #include #include #include #define IP_Protocol 0#define Port_No 15050#define Net_Buf_Size 32#define CipherKey 'S'#define SendRecvFlag 0#define NoFile "File Not Found!"// function for clearing buffervoid clearBuf(char* b1){   int i;   for (i = 0; i < Net_Buf_Size; i++)   b1[i] = '';}// function for encryption methodchar Cipher(char ch1){   return ch1 ^ CipherKey;}// function for sending fileint sendFile(FILE* fp1, char* buf1, int s1){   int i, len;   if (fp1 == NULL) {      strcpy(buf1, NoFile);      len = strlen(NoFile);      buf1[len] = EOF;      for (i = 0; i <= len; i++)      buf1[i] = Cipher(buf1[i]);      return 1;   }   char ch1, ch2;   for (i = 0; i < s1; i++) {      ch1= fgetc(fp);      ch2 = Cipher(ch1);      buf1[i] = ch2;      if (ch1 == EOF)      return 1;   }   return 0;}// driver codeint main(){   int sockfd1, nBytes;   struct sockaddr_in addr_con;   int addrlen = sizeof(addr_con);   addr_con.sin_family = AF_INET;   addr_con.sin_port = htons(Port_No);   addr_con.sin_addr.s_addr = INADDR_ANY;   char net_buf1[Net_Buf_Size];   FILE* fp1;   // socket()   sockfd1 = socket(AF_INET, SOCK_DGRAM, IP_Protocol);   if (sockfd1 < 0)      printf("
file descriptor is not received!!
");   else      printf("
file descriptor %d is received
                    
                                                                                                    
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", sockfd1);   // bind()   if (bind(sockfd1, (struct sockaddr*)&addr_con,      sizeof(addr_con)) == 0)      printf("
Successfully is binded!
");   else      printf("
Binding is Failed!
");   while (1) {      printf("
Waiting for name of file...
");      // receive name of file      clearBuf(net_buf1);      nBytes = recvfrom(sockfd1, net_buf1,      Net_Buf_Size, SendRecvFlag,      (struct sockaddr*)&addr_con,      &addrlen);      fp1 = fopen(net_buf1, "r");      printf("
File Name is Received: %s
", net_buf1);      if (fp1 == NULL)      printf("
File open is failed!
");      else      printf("
File Successfully is opened!
");      while (1) {         // process         if (sendFile(fp1, net_buf1, Net_Buf_Size)) {            sendto(sockfd1, net_buf1, Net_Buf_Size,            SendRecvFlag,            (struct sockaddr*)&addr_con,            addrlen);            break;         }         // send         sendto(sockfd1, net_buf1, Net_Buf_Size,         SendRecvFlag,         (struct sockaddr*)&addr_con, addrlen);         clearBuf(net_buf1);      }      if (fp1 != NULL)      fclose(fp1);   }return 0;}

// client code for UDP socket programming#include #include #include #include #include #include #include #include #define IP_Protocol 0#define IP_Address "127.0.0.1" // localhost#define Port_No 15050#define Net_Buf_Size 32#define CipherKey 'S'#define SendRecvFlag 0// function for clearing buffervoid clearBuf(char* b1){   int i;   for (i = 0; i < Net_Buf_Size; i++)   b1[i] = '';}// function for decryption methodchar Cipher(char ch1){   return ch1 ^ CipherKey;}// function for receiveing fileint recvFile(char* buf1, int s1){   int i;   char ch1;   for (i = 0; i < s1; i++) {      ch1 = buf1[i];      ch1 = Cipher(ch1);      if (ch1 == EOF)      return 1;      else      printf("%c", ch1);   }   return 0;}// driver codeint main(){   int sockfd1, nBytes;   struct sockaddr_in addr_con;   int addrlen = sizeof(addr_con);   addr_con.sin_family = AF_INET;   addr_con.sin_port = htons(Port_No);   addr_con.sin_addr.s_addr = inet_addr(IP_Address);   char net_buf1[Net_Buf_Size];   FILE* fp1;   // socket()   sockfd1 = socket(AF_INET, SOCK_DGRAM,   IP_Protocol);   if (sockfd1 < 0)   printf("
file descriptor is not received!!
");   else   printf("
file descriptor %d is received
", sockfd1);   while (1) {      printf("
Please enter the name of file to receive:
");      scanf("%s", net_buf1);      sendto(sockfd1, net_buf1, Net_Buf_Size,      SendRecvFlag, (struct sockaddr*)&addr_con,      addrlen);      printf("
---------Data is Received---------
");      while (1) {         // receive         clearBuf(net_buf1);         nBytes = recvfrom(sockfd1, net_buf1, Net_Buf_Size,         SendRecvFlag, (struct         sockaddr*)&addr_con,         &addrlen);         // process         if (recvFile(net_buf1, Net_Buf_Size)) {            break;         }      }      printf("
-------------------------------
");   }   return 0;}