c - Garbled characters when sniff the http data and store them using pcap -


i filter "port 80" , start catch using pcap_loop(phandle,-1,pcap_callback,null); 

the pcap_callback function  void pcap_callback(u_char* user,const struct pcap_pkthdr* header, const u_char* pkt_data){     file *fp=fopen("1.html","a");      ether_header * eheader=(ether_header*)pkt_data;     if(eheader->ether_type==htons(ethertype_ip)){      ip_header* ih=(ip_header*)(pkt_data+14);      if(ih->proto==htons(tcp_protocal)){       int ip_len=ntohs(ih->tlen);            int find_http=false;       char* ip_pkt_data=(char*)ih;       int n=0;       char buffer[buffer_max_length];       int bufsize=0;        for(;n<ip_len;n++)    {      /* http or post request */      if(!find_http && ((n+3<ip_len && strncmp(ip_pkt_data+n,"get",strlen("get")) ==0 )             || (n+4<ip_len && strncmp(ip_pkt_data+n,"post",strlen("post")) == 0)) )       find_http = true;      /* http response */      if(!find_http && n+8<ip_len && strncmp(ip_pkt_data+n,"http/1.1",strlen("http/1.1"))==0)       find_http = true;    /* if http found */     if(find_http)       {         buffer[bufsize] = ip_pkt_data[n]; /* copy http data buffer */         bufsize ++;       }    }      /* print http content */      if(find_http) {    buffer[bufsize] = '\0';    printf("%s\n", buffer);    printf("\n**********************************************\n\n");    int i=0;    char c;    for(i=0;i<bufsize;i++)     {       c=buffer[i];       fputc(c,fp);     }    fclose(fp);       }     }   }  }

and run , , visit google.com

it can print request/response headers @ screen, 1 or 2 wired characters(a little box within 4 numbers(1 or 0)). ,i store them html file, still mess. if cat 1.html @ shell, data after response headers multiple lines, of them show in white background , stick together.

if open in emacs, display ^@^@^s\234\252.if paste them here, show difference. guess maybe it picture or other file gif or course problem, because response headers show content-type: image/png.
when content-type: text/html; charset=utf-8, mess.

why? , how solve it?

thanks!!


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