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增加调试信息

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chn 2019-09-20 11:44:13 +08:00
parent 00ebf8a8c9
commit 508ba59c92
2 changed files with 19 additions and 11 deletions
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2
Makefile
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@ -2,7 +2,7 @@ include $(TOPDIR)/rules.mk
include $(INCLUDE_DIR)/kernel.mk
PKG_NAME:=xmurp-ua
PKG_RELEASE:=17
PKG_RELEASE:=22
include $(INCLUDE_DIR)/package.mk

28
src/xmurp-ua.c
View File

@ -154,39 +154,47 @@ unsigned int hook_funcion(void *priv, struct sk_buff *skb, const struct nf_hook_
register u_int8_t jump_to_next_function = 0, ret;
// 过滤发往外网的HTTP请求的包，且要求包的应用层内容不短于3字节
debug_n++;
if(skb == 0)
{
if(debug_n < 10)
printk("xmurp-ua warning, something maybe wrong.\n");
// if(debug_n < 10)
// printk("xmurp-ua warning, something maybe wrong.\n");
return NF_ACCEPT;
}
iph = ip_hdr(skb);
if((ntohl(iph->daddr) & 0xffff0000) == 0xc0a80000)
{
if(debug_n < 10)
printk("xmurp-ua bypass as dst in local net.\n");
// if(debug_n < 10)
// printk("xmurp-ua bypass as dst in local net.\n");
return NF_ACCEPT;
}
if(iph->protocol != IPPROTO_TCP)
{
if(debug_n < 10)
printk("xmurp-ua bypass as protocol not tcp.\n");
// if(debug_n < 10)
// printk("xmurp-ua bypass as protocol not tcp.\n");
return NF_ACCEPT;
}
tcph = tcp_hdr(skb);
if(ntohs(tcph->dest) != 80)
{
if(debug_n < 10)
printk("xmurp-ua bypass as port %u not 80.\n", ntohs(tcph->dest));
// if(debug_n < 10)
// printk("xmurp-ua bypass as port %u not 80.\n", ntohs(tcph->dest));
return NF_ACCEPT;
}
data_start = (char *)tcph + tcph->doff * 4;
data_end = (char *)tcph + ntohs(iph->tot_len) - iph->ihl * 4;
debug_n++;
if(data_end - data_start < 4)
{
if(debug_n < 10)
printk("xmurp-ua bypass as data too short.\n");
printk("xmurp-ua bypass as data too short.");
if(debug_n < 10)
printk("xmurp-ua tcph -> doff = %x, iph -> tot_len = %x, iph -> ihl = %x.\n", tcph -> doff, iph -> tot_len, iph -> ihl);
if(debug_n < 10)
printk("xmurp-ua iph -> tot_len - iph, %x.\n", (char*)&(iph -> tot_len) - (char*)iph);
if(debug_n < 10)
printk("xmurp-ua iph -> tot_len %x.\n", *((u_int16_t*)&(iph -> tot_len)));
if(debug_n < 10)
printk("xmurp-ua iph message %x %x %x %x %x %x %x %x %x %x %x.\n", iph -> version, iph -> ihl, iph -> tos, iph -> tot_len, iph -> id, iph -> frag_off, iph -> ttl, iph -> protocol, iph -> check, iph -> saddr, iph -> daddr);
return NF_ACCEPT;
}
if(skb->mark & 0x00000001)