綁定：不能分配請求的地址

Question

可能重複：
Cannot assign requested address - possible causes?

#include <sys/types.h> 
#include <sys/socket.h> 
#include <sys/wait.h> 
#include <netinet/in.h> 
#include <stdio.h> 
#include <stdlib.h> 
#include <errno.h> 
#include <unistd.h> 
#include <netdb.h> 
#include <time.h> 
#include <string.h> 

#ifdef STRERROR 
extern char *sys_errlist[]; 
extern int sys_nerr; 
char *undef = "Undefined error"; 

char *strerror(error) 
int error; 
{ 
    if (error > sys_nerr) 
     return undef; 
    return sys_errlist[error]; 
} 
    #endif 
    #define CIAO_PS "bfi_2" 

main(argc, argv) 
    int argc; 
    char **argv; 
{ 
    int lsock, csock, osock; 
    FILE *cfile; 
    char buf[4096]; 
    struct sockaddr_in laddr, caddr, oaddr; 
    int caddrlen = sizeof(caddr); 
    fd_set fdsr, fdse; 
    struct hostent *h; 
    struct servent *s; 
    int nbyt; 
    unsigned long a; 
    unsigned short oport; 
    int i, j, argvlen; 
    char *bfiargv[argc+1]; 
    char *fintops = CIAO_PS ; 

    if(argc < 4) 
    { 
     fprintf(stderr,"Usage: %s localport remoteport remotehost fakeps\n",argv[0]); 
     return 30; 
    } 

    for(i = 0; i < argc; i++) 
    { 
     bfiargv[i] = malloc(strlen(argv[i]) + 1); 
     strncpy(bfiargv[i], argv[i], strlen(argv[i]) + 1); 
    } 

    bfiargv[argc] = NULL; 
    argvlen = strlen(argv[0]); 

    if(argvlen < strlen(CIAO_PS)) 
    { 
     printf("Se vuoi fregare davvero ps vedi di lanciarmi almeno come superFunkyDataPipe !\n") ; 
     abort(); 
    } 

    if(bfiargv[4]) fintops=bfiargv[4] ; 
    strncpy(argv[0], fintops, strlen(fintops)); 

    for(i = strlen(fintops); i < argvlen; i++) 
     argv[0][i] = '\0'; 

    for(i = 1; i < argc; i++) 
    { 
     argvlen = strlen(argv[i]); 
     for(j=0; j <= argvlen; j++) 
      argv[i][j] = '\0'; 
    } 

    a = inet_addr(argv[3]); 

    if(!(h = gethostbyname(bfiargv[3])) && !(h = gethostbyaddr(&a, 4, AF_INET))) 
    { 
     perror(bfiargv[3]); 
     return 25; 
    } 

    oport = atol(bfiargv[2]); 
    laddr.sin_port = htons((unsigned short)(atol(bfiargv[1]))); 

    if((lsock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) == -1) 
    { 
     perror("socket"); 
     return 20; 
    } 

    laddr.sin_family = htons(AF_INET); 
    // laddr.sin_addr.s_addr = htonl(0); 
    laddr.sin_addr.s_addr = inet_addr("IP OF THE PROXY"); 

    if(bind(lsock, &laddr, sizeof(laddr))) 
    { 
     perror("bind"); 
     return 20; 
    } 

    if(listen(lsock, 1)) 
    { 
     perror("listen"); 
     return 20; 
    } 

    if((nbyt = fork()) == -1) 
    { 
     perror("fork"); 
     return 20; 
    } 

    if (nbyt > 0) 
     return 0; 

    setsid(); 
    while((csock = accept(lsock, &caddr, &caddrlen)) != -1) 
    { 
     cfile = fdopen(csock,"r+"); 
     if((nbyt = fork()) == -1) 
     { 
      fprintf(cfile, "500 fork: %s\n", strerror(errno)); 
      shutdown(csock,2); 
      fclose(cfile); 
      continue; 
     } 

     if (nbyt == 0) 
      goto gotsock; 

     fclose(cfile); 
     while (waitpid(-1, NULL, WNOHANG) > 0); 
    } 

    return 20; 

gotsock: 
    if((osock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) == -1) 
    { 
     fprintf(cfile, "500 socket: %s\n", strerror(errno)); 
     goto quit1; 
    } 

    oaddr.sin_family = h->h_addrtype; 
    oaddr.sin_port = htons(oport); 
    memcpy(&oaddr.sin_addr, h->h_addr, h->h_length); 
    if(connect(osock, &oaddr, sizeof(oaddr))) 
    { 
     fprintf(cfile, "500 connect: %s\n", strerror(errno)); 
     goto quit1; 
    } 

    while(1) 
    { 
     FD_ZERO(&fdsr); 
     FD_ZERO(&fdse); 
     FD_SET(csock,&fdsr); 
     FD_SET(csock,&fdse); 
     FD_SET(osock,&fdsr); 
     FD_SET(osock,&fdse); 

     if(select(20, &fdsr, NULL, &fdse, NULL) == -1) 
     { 
      fprintf(cfile, "500 select: %s\n", strerror(errno)); 
      goto quit2; 
     } 

     if(FD_ISSET(csock,&fdsr) || FD_ISSET(csock,&fdse)) 
     { 
      if ((nbyt = read(csock,buf,4096)) <= 0) 
       goto quit2; 
      if ((write(osock,buf,nbyt)) <= 0) 
       goto quit2; 
     } 
     else if(FD_ISSET(osock,&fdsr) || FD_ISSET(osock,&fdse)) 
     { 
      if ((nbyt = read(osock,buf,4096)) <= 0) 
       goto quit2; 
      if ((write(csock,buf,nbyt)) <= 0) 
       goto quit2; 
     } 
    } 

quit2: 
    shutdown(osock,2); 
    close(osock); 

quit1: 
    fflush(cfile); 
    shutdown(csock,2); 

quit0: 
    fclose(cfile); 
    return 0; 
} 

我在想，由於某種原因，我沒有編譯它，當我運行它，我總是最後有此錯誤

./proxyapp 5121 5121我的真實服務器的IP IPhar 綁定：無法分配請求的地址

它應該將3個端口重定向到具有相同端口的特定代理IP。

請幫助

Answer 1

端口5121已在使用中。嘗試另一種方法，或者設置SO_REUSEADDR，如果它只是程序上一次運行的人造物。

注意您需要關閉套接字，而不是關閉套接字。