.cコードのコンパイル時にsocklen_tが宣言されていません

Question

MinGW（gcc file.c -ocompiled.exe）を使用してWindowsでこの.cコードをコンパイルしようとしています：

/***************************************************/ 
/* AUTHOR         :  LAW CHIU YUEN                 */
/* FILENAME     :  smtpr.c                         */
/***************************************************/ 

#ifdef WIN32
#include <windows.h>
#include <winsock.h>
#else
#define closesocket close
#include <unistd.h>
#include <netdb.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#endif

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <arpa/inet.h>
#include <ctype.h>


//#define MYPORT 40711    // the port users will be connecting to
#define PORT 25
#define MAXBUFLEN 1024      // max buffer size
#define RELAY_NAME 255 // max length of file name
#define BACKLOG 10     // how many pending connections queue will hold
#define MAXDATASIZE 512 // max number of bytes we can get at once 
#define SQMAXDATASIZE 1048576 //1024 * 1024
#define RECVTIME 100    // max number of time to wait for client's message
#define MAXEMAILADDRESS 320 // 64 + 1 + 255 
#define MAXRCPT 50     //max number of mail receipients
/* State1 */
#define ACCEPT 0
#define HELO 1
#define MAILFROM 2
#define RCPTTO 3
#define DATA 4
#define MESSAGE 5
#define QUIT 6
#define RELAY 7
/* State2 */
#define FIRSTHELO 0
#define SECONDHELO 1
#define MAXHELO 1024

/*  tokenize mailto string, each time return the first email address */
/* eg.  [email protected],[email protected],[email protected] -->  [email protected]  */
char* tokenize(char *mailto){
     const char delimiters[] = ",";
     char *token, *cp;
     printf("b4 strtok: mailto:%s\n",mailto);     
                /* Make writable copy.  */
     token = strtok (mailto, delimiters);      /* token => "words" */
     printf("tokenize() speaking : mailto: %s\n",mailto);
     printf("tokenize() speaking : token: %s\n",token);
     return token;

}

/*  tokenize mailto string, each time return the email address other then the first one*/
/* first call:  [email protected],[email protected],[email protected] -->  [email protected]  */
/* second call:  [email protected],[email protected],[email protected] -->  [email protected]  */
char* tokenize_null(){
     const char delimiters[] = ",";
     char *token, *cp;

     token = strtok (NULL, delimiters);      /* token => "words" */
     printf("tokenize_null() speaking : token: %s\n",token);
     return token;
}

/* take in an email_address, and header; */
/*  convert to :  header: email_address  */
char* compose_mailheader(char *header,char *mail){
  char *a = malloc(strlen(mail)+30);
  char *b = NULL;
  char *c = NULL;
  strcpy(a, header);

  b = strcat(a, mail);
  c = strcat(b, "\r\n");
  printf("compose_mailheader:   b=%s\n", b);
  return b;
}

/*  1. receive message from smtp server  */
void receive(int fd, char* command, char *buf){
 int numbytes;

   if ((numbytes=recv(fd, buf, MAXDATASIZE, 0)) == -1) {
        fprintf(stderr,"error in receiving\n");
        exit(1);
    }
    buf[numbytes] = '\0';
    printf("    receive() Received buf : %s",buf);
    if ( strstr(buf, command) != NULL ){
    printf("    receive() Received command : %s\n",command);
    }else{
    }
}
/*  helo  */
/*  1. called by relaymail()  */
/*  2. interact with a smtp server */
void helo(int sockfd){
  int numbytes;
  char buf2[MAXDATASIZE];
  char buf[MAXDATASIZE];
  printf("\n");
  printf("helo is called\n");
  /*receive 220*/
  receive(sockfd, "220 ", buf);

  /* send helo */
  if (send(sockfd, "HELO server\r\n", 13, 0) == -1)
    perror("HELO SERVER");
//  printf("sent HELO SERVER\n");

/* receive 250*/
  receive(sockfd, "250 ", buf);

/*      testing    */  
//  if (send(sockfd, "HELO server\r\n", 13, 0) == -1)
//    perror("HELO SERVER");

//  receive(sockfd, "250 ", buf);
}

/*  mailfrom  */
/*  1. called by relaymail()  */
/*  2. interact with a smtp server */
void mailfrom(int sockfd,char *mail_from){
  char buf[MAXDATASIZE] = "MAIL FROM:";

  char *out;
  int numbytes;
  int i;
  printf("\n");
  printf("mailfrom is called\n");

  /*  compose the "MAIL FROM:[email protected]" message  */ 
  strcat(buf, mail_from);
  strcat(buf, "\r\n");
  printf("mailfrom() speaking: buf=%s\n", buf);
  printf("mailfrom() speaking: strlen(buf)=%i\n", strlen(buf));

  /* send out */
  if( send(sockfd, buf, strlen(buf), 0) == -1 )
     perror("mailfrom()");

  /* receive 250*/
  receive(sockfd, "250 ", buf);

}  //mailfrom

/*  1. called by rcptto()  */
/*  2. interact with a smtp server */
void rcptto2(int sockfd,char *mailtos){
  char buf[MAXDATASIZE]="";
  char *a;
  char *out;
  int numbytes;
  int i,len;
  printf("\n");
  printf("rcptto2 is called\n");
  /*  compose the "RCPT TO:[email protected]" message  */ 
    strcat(buf, "RCPT TO:");
    strcat(buf, tokenize_null());
    strcat(buf, "\r\n");
    printf("rcptto2() speaking: buf=%s\n", buf);
    printf("rcptto2() speaking: strlen(buf)=%i\n", strlen(buf));

    /*  send out */
    if( send(sockfd, buf, strlen(buf), 0) == -1 )
       perror("rcptto()");

    /*  receive 250*/
    receive(sockfd, "250 ", buf);
    /*  clear the buffer  */
    for(i=0; i<strlen(buf);i++){
     buf[i]='\0';
    }//for()

}

/*  rcptto  */
/*  1. called by relaymail()  */
/*  2. interact with a smtp server */
void rcptto(int sockfd,char *mailtos, int mailto_num){
  char buf[MAXDATASIZE] = "RCPT TO:";
  char *a;
  char *out;
  int numbytes;
  int i,len;
  printf("\n");
  printf("rcptto is called\n");

/* sending the first address... */
    /*  compose the "RCPT TO:[email protected]" message  */ 
    strcat(buf, tokenize(mailtos));
    strcat(buf, "\r\n");
    printf("rcptto() speaking: buf=%s\n", buf);
    printf("rcptto() speaking: strlen(buf)=%i\n", strlen(buf));

    /*  send out */
    if( send(sockfd, buf, strlen(buf), 0) == -1 )
       perror("rcptto()");

    /*  receive 250*/
    receive(sockfd, "250 ", buf);
    /*  clear the buffer  */

    /*  handle multiple recipients case*/
    for(i=0;i<mailto_num-1;i++)
      rcptto2(sockfd, mailtos);


/* sending remaining addresses... */
}  //rcptto

/*  1. called by relaymail()  */
/*  2. interact with a smtp server */
void data(int sockfd){
  char buf[MAXDATASIZE] = "";
  printf("\n");
  printf("data() is called\n");

  /*  send "DATA"  */
  if( send(sockfd, "DATA\r\n", 6, 0) == -1 )
     perror("data()");

  /*  receive 354  */
  receive(sockfd, "354 ", buf);
}


/*  1. called by relaymail()  */
/*  2. interact with a smtp server */
void message(int sockfd, char *msg){
  int times,i,j;
  int remainder;
  printf("\n");
  char out[1025];
  printf("message() is called\n");

  times = strlen(msg) / MAXDATASIZE;
  remainder = strlen(msg) - (times * MAXDATASIZE);

  printf("remainder: %i\n", remainder);
  printf("times: %i\n", times);

  for (i=0;i< times;i++){
     for (j=0;j< 1024;j++)
        out[j]= msg[1024*i + j];
     out[1024 +1] = '\0';

     printf("sending msg: %i\n", i);
      if( send(sockfd, out, 1025, 0) == -1 );
  }
  printf("end while: %i\n", i);
  printf("out: %s\n", out);
     for (j=0;j< remainder;j++)
        out[j]= msg[1024*times + j];
        out[remainder +1] = '\0';
  if( send(sockfd, out, remainder+1, 0) == -1 )
       perror("message");
       printf("out: %s\n", out);
}

/*  1. called by relaymail()  */
/*  2. interact with a smtp server */
void quit(int sockfd){
  char buf[MAXDATASIZE] = "";
  printf("\n");
  printf("quit() is called\n");

  /*  send "QUIT"  */
  if( send(sockfd, "QUIT\r\n", 6, 0) == -1 )
     perror("quit()");

  /*  receive 354  */
  receive(sockfd, "250 ", buf);
}


/*relay mail to a email server*/
void relaymail(char *relay,char *mail_from, char *mailto, int mailto_num, char *msg){

    int sockfd, numbytes;  
    char buf[MAXDATASIZE];
    struct hostent *he;
    struct sockaddr_in their_addr; // connector's address information 
    int state = 1;
    int logswitch = 0; 
  int logwhile = 0;


    if ((he=gethostbyname(relay)) == NULL) {  // get the Host info 
        fprintf(stderr,"gethostbyname fail\n");
        exit(1);
    }

    if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
        fprintf(stderr,"fail to create socket\n");
        exit(1);
    }

    their_addr.sin_family = AF_INET;    // Host byte order 
    their_addr.sin_port = htons(PORT);  // short, network byte order 
    their_addr.sin_addr = *((struct in_addr *)he->h_addr);
    memset(&(their_addr.sin_zero), '\0', 8);  // zero the rest of the struct 

    if (connect(sockfd, (struct sockaddr *)&their_addr, sizeof(struct sockaddr)) == -1) {
        fprintf(stderr,"connect fail\n");
        exit(1);
    }

   while (state <7 && logwhile <10){  /*  make sure the program won't run indefinitely  */

   logwhile++;
   /*   log   */ 
//      printf("\n");
//   printf("logwhile = %i\n", logwhile);
//   printf("state = %i\n", state);
//      printf("\n");

   switch (state){
    case HELO :
     helo(sockfd);
     state++;
     printf ("end of case HELO\n");
     break;
    case MAILFROM :
     mailfrom(sockfd, mail_from);
     state++;
     printf ("relaymail():  end of case MAILFROM\n");    
     break;
    case RCPTTO :
     rcptto(sockfd, mailto, mailto_num);
     state++;
     printf ("relaymail():  end of case RCPTTO\n");         
     break;    
    case DATA :
     data(sockfd);
     state++;
     printf ("relaymail():  end of case DATA\n");
     break;
    case MESSAGE :
     message(sockfd, msg);
     printf ("relaymail():  end of case MESSAGE\n");
     state++;
     printf ("relaymail():  end of case MESSAGE\n");
    case QUIT :
     quit(sockfd);
     state++;
     printf ("end of case QUIT\n");
     closesocket(sockfd);
     break;

    default :
     break;    
    }
  }  // while()
    closesocket(sockfd);
}


/*  remove  < >   */
char* remove_brackets(char* input)
{
  int length;
  int i, j;
  char* output;

  length = strlen(input);
  output = (char*) malloc(length + 1); 
  j = 0;

  /* copy character of input which in not equal to < or > to output */
  for (i=0; i<length; i++)
    if ((input[i]!='<') && (input[i]!='>'))
    {
      output[j] = input[i];
      j++; 
    }     
  output[j] = '\0';

  return output;
}


/* trim the space(s) before and after the string */
char* trim_space(char* input)
{
  int i, j, length, is_ch, is_end, end_pos;
  char *output;

  /* trim the space(s) before the string */
  length = strlen(input);
  output = (char*) malloc (length+1);
  is_ch = 0;
  is_end = 0;
  j = 0;

  for(i=0; i<length; i++)
  {
    /* copy input characters to output */
    if (is_ch==1 || !isspace(input[i]))
    {
      output[j] = input[i];
      j++;
      is_ch = 1;
    }
 }
  output[j] = '\0';

  /* trim the space(s) after the string */
  length = strlen(output);
  end_pos = length-1;
  is_end = 0;

  for (i=0; i<length; i++)
    if (is_end==0 && isspace(output[i]))
    {
      is_end = 1;
      end_pos = i;   
    }   
    else if (!isspace(output[i]))
      is_end = 0; 

  output[end_pos] = '\0';

  return output;
}


/* convert :    MAIL FROM: [email protected]  --->  [email protected] */
char *extractemail(const char *buf, const int i){
char * email = NULL;
char * tmp_email = NULL;
char * tmp_email2 = NULL;
char * tmp_email3 = NULL;

 /*           extract email address              */
/*  1. remove MAIL FROM:  */
    email = malloc(strlen(buf));
        strcpy(email,buf);
        email += i;
        printf("\n");
        printf("email =%s\n", email);
        printf("email length =%i\n", strlen(email));
        printf("\n");
/*  2. trim head and trailing whitespace  */
        tmp_email = trim_space(email);
        printf("trimmed email= %s\n", tmp_email);
/*  3. remove <>  */
    tmp_email2 = remove_brackets(tmp_email);
    printf("remove<> email= %s\n", tmp_email2);
/*  4. trim again */
//    tmp_email3 = trim_space("[email protected]");
//    printf("\n");
//    printf("extracted email= ~~~~~~%s~~~~~~\n", tmp_email3);
//    printf("\n");

//    printf("extracted email= ~~~~~~%s~~~~~~\n", tmp_email3);
    return tmp_email2;
}


/* check if email address is a valid one  */
int check_email_validity(const char *address) {
  // check if email address is valid
 // return 1 if valid
 // return 0 if invalid

  int number = 0;
  const char *a, *Host;
  static char *special_characters = "()<>@,;:\\\"[]";
   /* validate name  */
  for (a = address;  *a;  a++) {
    if (*a == '\"' && (a == address || *(a - 1) == '.' || *(a - 1) == 
        '\"')) {
      while (*++a) {
        if (*a == '\"') break;
        if (*a == '\\' && (*++a == ' ')) continue;
        if (*a <= ' ' || *a >= 127) return 0;
      }
      if (!*a++) return 0;
      if (*a == '@') break;
      if (*a != '.') return 0;
      continue;
    }
    if (*a == '@') break;
    if (*a <= ' ' || *a >= 127) return 0;
    if (strchr(special_characters, *a)) return 0;
  }
  if (a == address || *(a - 1) == '.') return 0;

  /* next we validate the Host portion (name@Host) */
  if (!*(Host = ++a)) return 0;
  do {
    if (*a == '.') {
      if (a == Host || *(a - 1) == '.') return 0;
      number++;
    }
    if (*a <= ' ' || *a >= 127) return 0;
    if (strchr(special_characters, *a)) return 0;
  } while (*++a);

  return (number >= 1);
}

int main(int argc, char *argv[])
{
 int sockfd, new_fd;  // listen on sock_fd, new connection on new_fd
    struct sockaddr_in my_addr;    // my address information
    struct sockaddr_in their_addr; // connector's address information
    int sin_size;
    int yes=1;
    socklen_t addr_len;
    int numbytes=0;
    char buf[MAXBUFLEN] = "";
    char tmp_msg[MAXBUFLEN] ="";
    char message[SQMAXDATASIZE];
    char message_buf[10000];
    char *msg = message;
    char quit[MAXBUFLEN];
    int MYPORT;
    char relay[RELAY_NAME];
    int i,j;
    char *email = NULL;
    char *email2 = NULL;
    char *mail_from = NULL;
    char *mail_to = NULL;
    char *tmp_mail = NULL;
    char mailtos[2000];
    int mailto_num =0;
    char *data = NULL;
    char *data2 = NULL;
    char *quit1 = NULL;
    char *quit2 = NULL;



    int state1 = 0;  //  
    int state2 = 0;  //  keep track of number of 'helo's
        int logwhile = 0;
    char hardcode_email[15] = "[email protected]";


    #ifdef WIN32
      WSADATA wsaData;
      WSAStartup(0x0101, &wsaData);
    #endif

    /* check number of parameters */
    if ( argc != 3 && argc !=2 ) {
  fprintf(stderr,"usage: smtpr <port number> (<relay server>)\n");
  exit(1);
    }

    /* fill in port number */
    MYPORT = atoi(argv[1]);
    if ( MYPORT <= 0){
 fprintf(stderr, "Invalid port number.\nusage: smtpr <port number> (<relay server>)\n");
        exit(1);
    }

    /* fill in the server relay to */
    if (argc == 2) strcpy(relay, "some.mail.server");
    else if (argc == 3) strcpy(relay, argv[2]);
    printf("relay to %s\n", relay);


/*create a TCP socket */
    if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
        perror("socket");
        exit(1);
    }

    printf("port number : %i\n", MYPORT);

    my_addr.sin_family = AF_INET;         // Host byte order
    my_addr.sin_port = htons(MYPORT);     // short, network byte order
    my_addr.sin_addr.s_addr = htonl(INADDR_ANY); // automatically fill with my IP
    memset(&(my_addr.sin_zero), '\0', 8); // zero the rest of the struct

/* bind to the port number*/
    if (bind(sockfd, (struct sockaddr *)&my_addr, sizeof(struct sockaddr)) == -1) {
        perror("bind");
        exit(1);
    }
/* listen*/
    if (listen(sockfd, BACKLOG) == -1) {
        perror("listen");
        exit(1);
    }  


    /* slow the receiving speed */
//    sleep(1);

while(1){

logwhile++;


switch ( state1 ){

case ACCEPT:
/* accept */
        sin_size = sizeof(struct sockaddr_in);
        if ((new_fd = accept(sockfd, (struct sockaddr *)&their_addr, &sin_size)) == -1) {
            perror("accept");
        }
        printf("server: got connection from %s\n",inet_ntoa(their_addr.sin_addr));

/* send msg : 220 */       
       if (send(new_fd, "220 cylaw's smtpr ready\r\n", 25, 0) == -1)
            perror("send");


/*proceed to next state*/
        printf("state1 = %i\n", state1);
        state1++;
    break;

case HELO:

      if(state2 == 0){ //state2 keep track of if this is the first HELO
          if ((numbytes=recv(new_fd, buf, MAXDATASIZE, 0)) == -1) {
              perror("recv");
              exit(1);
          }
        }
          buf[numbytes] = '\0';

/*   log   */ 
    printf("case HELO\n");
    printf("============\n");
        printf("buf :%s\n", buf);

/* check on length */
        if ( strlen(buf) < 6 || strlen(buf) > MAXDATASIZE ){
             printf("550 Syntax: <HELO>\n");
         if (send(new_fd, "550 Syntax: <HELO|EHLO> <hostname>\r\n", 36, 0) == -1)
         perror("HELO send");
         }

/* compare (case-insensitively) the first 4 bytes of buf with "HELO" and "EHLO"  */

        if ( (strncasecmp(buf, "HELO ", 5) != 0) && (strncasecmp(buf, "EHLO ", 5) != 0 )  ){
             printf("550 Syntax: <HELO>\n");
         if (send(new_fd, "550 Syntax: <HELO|EHLO> <hostname>\r\n", 36, 0) == -1)
         perror("HELO-1 send");
         }

/* not implement case : helo<space>aaaaa<space> */
        if ( buf[5] == '\0' && buf[5] == ' ' ){
             printf("550 Syntax: <HELO|EHLO> <hostname>\n");
         if (send(new_fd, "550 Syntax: <HELO|EHLO> <hostname>\r\n", 36, 0) == -1)
         perror("HELO-2 send");
         }

/* send 250 OK */
    printf("250 HELO OK\n");
        if ( send( new_fd, "250 HELO OK\r\n", 13, 0 ) == -1 )
        perror("HELO-250-OK send");
        printf("\n");



/*proceed to next state*/
        state1++;
        state2++;
        break; //case HELO

case MAILFROM :

        if ((numbytes=recv(new_fd, buf, MAXDATASIZE, 0)) == -1) {
            perror("recv");
            exit(1);
        }
        buf[numbytes] = '\0';


/*   log   */ 
        printf("\n");
    printf("case MAILFROM\n");
    printf("=============\n");
        printf("buf :%s\n", buf);



/* HELO */
    if ( (strncasecmp(buf, "HELO ", 5) == 0) || (strncasecmp(buf, "EHLO ", 5) == 0 )  ){
    printf("HELO received at case MAILFROM, go back to case HELO\n");
     state1--;
     break;
    }

/*  check "MAIL FROM:"   */
        if ( strncasecmp(buf, "MAIL FROM:", 10) != 0 ){
             printf("550 Syntax: MAIL FROM: <email-address>\n");
         if (send(new_fd, "550 Syntax: MAIL FROM: <email-address>\r\n", 40, 0) == -1)
           perror("MAIL FROM: send()");
          exit(1);
        }

/*  extract email address  */
    mail_from = extractemail(buf, 10);


/*  check email validity  */  

        if ( check_email_validity(mail_from) == 0 ){  //0 - invalid 1 - valid
             printf("550 Invalid email address\r\n");
         if (send(new_fd, "550 Invalid email address\r\n", 27, 0) == -1)
          perror("Email address send()");
         break; //case MAILFROM

         }

/* send 250 OK */
    printf("250 MAIL FROM OK\n");
        if ( send( new_fd, "250 MAIL FROM OK\r\n", 18, 0 ) == -1 )
        perror("MAILFROM-250-OK send()");

        printf("\n");

        state1++;
        break; //case MAILFROM

case RCPTTO :

/*  check if this is the first MAIL FROM: <> line  */
if ( mailto_num == 0){  
        if ((numbytes=recv(new_fd, buf, MAXDATASIZE, 0)) == -1) {
            perror("recv");
            exit(1);
        }
        buf[numbytes] = '\0';
}


/*   log   */ 
        printf("\n");
    printf("case RCPTTO\n");
    printf("=============\n");
        printf("state1 = %i\n", state1);
        printf("buf :%s\n", buf);


/*  check RCPT TO: <...>   */
        if ( strncasecmp(buf, "RCPT TO:", 8) != 0 ){
             printf("550 Syntax: RCPT TO: <email-address>\n");
             if (send(new_fd, "550 Syntax: RCPT TO: <email-address>\r\n", 38, 0) == -1)
         perror("MAIL FROM: send()");
        }

/*  extract email address  */
   mail_to = extractemail(buf, 8);  // 8 = strlen("RPCT TO:")


/*  recipients address on to mailtos []*/
  strcat(mailtos, mail_to);
  strcat(mailtos, ",");
  mailto_num++;
  printf("mailtos %s\n", mailtos);
  printf("mailto_num %i\n", mailto_num);



/*  check email validity  */  

        if ( check_email_validity(mail_to) == 0 ){
             printf("550 Invalid email address\n");
         if (send(new_fd, "550 Invalid email address\r\n", 27, 0) == -1)
         perror("RCPTTO address send()");
         break; //case MAILFROM

         }

/* send 250 OK */
    printf("250 RCPT TO OK\n");
        if ( send( new_fd, "250 RCPT TO OK\r\n", 16, 0 ) == -1 )
        perror("MAILFROM-250-OK send()");

        state1++;
    break; // case RCPTTO

case DATA :

        if ((numbytes=recv(new_fd, buf, MAXDATASIZE, 0)) == -1) {
            perror("recv");
            exit(1);
        }
        buf[numbytes] = '\0';


     /*   log   */ 
        printf("\n");
    printf("case DATA\n");
    printf("=============\n");
        printf("state1 = %i\n", state1);
        printf("buf :%s\n", buf);


/*  multiple recipients */

    if ( strncasecmp(buf, "RCPT TO:", 8 ) == 0){
     printf("Multiple recipients -- Go back to state RCPT TO\n");
     printf("\n");
     state1--;
     break;
    }

        if ( strncasecmp(buf,"DATA", 4) != 0 ){  
             printf("451 Syntax: DATA\n");      
         if (send(new_fd, "451 Syntax: DATA\r\n", 18, 0) == -1)
          perror("DATA send");
         } else{



/* send 354 OK */
//    send( new_fd, "354 End\r\n", 10, 0 );
    printf("354 End data with <CR><LF>.<CR><LF>\n");
        if ( send( new_fd, "354 End data with <CR><LF>.<CR><LF>\r\n", 37, 0 ) == -1 ){
         perror("MAILFROM-354-OK send()");
         printf("354 error\n");
         exit(1);
       }

        printf("\n");
      }


  state1++;
 break; // case DATA


case MESSAGE :

       printf("\n");
    printf("case MESSAGE\n");
    printf("============\n");

    i=0;
    while(i<10000){
     i++;
         if ((numbytes=recv(new_fd, message_buf, 9999, 0)) == -1) {
             perror("recv");
             exit(1);
         }
         message_buf[numbytes] = '\0';
/*  log  */
//         printf("message_buf:\n\n%s", message_buf);        
/*  append message_buf to message  */         
         strcat(message, message_buf);

         if (strstr (message_buf, "\r\n.\r\n") != NULL ){
/* send 250 OK */
          printf(". found\n");
          if ( send( new_fd, "250 message received\r\n", 22, 0 ) == -1 )
             perror("MESSAGE");
          printf("message:\n\n %s\n", message);
          state1++;
      break;
         }//if()
       }//while()
       state1++;
       break;

case QUIT :

        if ((numbytes=recv(new_fd, quit, MAXDATASIZE, 0)) == -1) {
            perror("recv");
            exit(1);
        }
        quit[numbytes] = '\0';

     /*   log   */ 
    printf("\n");
    printf("case QUIT\n");
    printf("=============\n");
        printf("buf :%s\n", quit);
        printf("\n");

    /*  trim space "     QUIT       "  */    
//        quit1 = malloc(strlen(quit));
//        strcpy(quit1, quit);
//        printf("quit :%s\n", quit1);
//        quit2 = trim_space(quit1);
//        printf("quit :%s\n", quit1);


/*  check QUIT   */
        if ( strncasecmp(quit, "QUIT", 4) != 0 ){
             state1 =  QUIT;
         if (send(new_fd, "550 Syntax: QUIT\r\n", 18, 0) == -1)
         perror("QUIT");
        }else{

/* send 221 OK */
        if ( send( new_fd, "221 QUIT.\r\n", 11, 0 ) == -1 )
        perror("QUIT");
printf("QUIT!\n");
closesocket(new_fd);
state1++;
break;
}
 break; // case QUIT

case RELAY :
  relaymail(relay,mail_from,mailtos,mailto_num, msg);

  /* go back to ACCEPT states  */
  state1 = ACCEPT;  

/* reset variables  */
  strcpy(buf, "");
  strcpy(tmp_msg, "");
  strcpy(message, "");
    strcpy(message_buf, "");
  strcpy(quit,"");
    i=0;j=0;
    email = NULL;
    email2 = NULL;
    mail_from = NULL;
    mail_to = NULL;
    tmp_mail = NULL;
  strcpy(mailtos, "");
    mailto_num =0;
    data = NULL;
    data2 = NULL;
    quit1 = NULL;
    quit2 = NULL;
  state2 = 0;

break;

default : break;

}//switch
} // while(1)

        close(new_fd);

    #ifdef WIN32
      WSACleanup();
    #endif

    return 0;
}

しかし、エラーで失敗します：

C:\MinGW\bin>gcc file.c -o compiled.exe
file.c: In function `main':
file.c:973: error: `socklen_t' undeclared (first use in this function)
file.c:973: error: (Each undeclared identifier is reported only once
file.c:973: error: for each function it appears in.)
file.c:973: error: syntax error before "addr_len"

エラーをグーグルで検索してみましたが、特定のソフトウェアのコンパイルに関する情報だけが見つかりましたが、原因はわかりませんでした。

このエラーを修正するにはどうすればよいですか？

Answer 1

それがどの.hファイルで定義されているかを把握し、それを含めます。 Unix/Linuxボックスでは、/ usr/includeのfind/grepから始めます。

$ find /usr/include -name \*.h -print0 |xargs -0 grep -w socklen_t
...
/usr/include/unistd.h:typedef __socklen_t socklen_t;
...
/usr/include/sys/socket.h:         socklen_t *__restrict __addr_len);

Unistd.hで定義されているように見えますが、すでに含まれているので、その側でカバーされていると思います。 Windows側に含めるファイルをどのように見つけるかわかりません。

Answer 2

Mingwの下で、ws2tcpip.hを含めることができます

#include <ws2tcpip.h>

Answer 3

socket.hを確認してください-それが定義されている可能性が最も高いです。 socket.hに含まれているため（cygwin/socket.hが含まれているため）、コードはCygWinで正常にコンパイルされます。

typedef int socklen_t;

応急修理として、その行を独自のコードに追加してみてください。しかし、それでもwhyが欠落していることを調査し、バグレポートを作成する必要があります。

MinGWがsocklen_tをサポートしていないと不平を言うページが非常にたくさんあります。たとえば、 ここ 、 ここ 、 ここ 、 ここ =、最後のものは、上記の私の応急修理で定義したように、それがws2tcpip.hにあることを示しています。

Answer 4

nix Specification によると、socket.hは、少なくとも32ビットの長さの符号なし不透明整数型であるsocklen_t型を使用可能にします。どうやらMingWはそれを含んでいません。

次のように定義できます。

#include <stdint.h>
typedef uint32_t socklen_t;

Answer 5

Windowsの場合、socklen_tの定義を取得するには：

#include <ws2tcpip.h>

VS2017およびこの記事の執筆時点で有効です。 https://docs.Microsoft.com/en-us/windows/win32/api/ws2tcpip/nf-ws2tcpip-getnameinfo に基づいています。

特定のLinuxベースのソケットソースファイルをWindowsに移植する必要があることがわかった他の2つのヘッダーは次のとおりです。

#include <winsock2.h>
#include <Ws2ipdef.h>