chn/xmurp-ua
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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 include $(INCLUDE_DIR)/kernel.mk
PKG_NAME:=xmurp-ua PKG_NAME:=xmurp-ua
PKG_RELEASE:=17 PKG_RELEASE:=22
include $(INCLUDE_DIR)/package.mk 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; 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 // 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(skb == 0)
{ {
if(debug_n < 10) // if(debug_n < 10)
printk("xmurp-ua warning, something maybe wrong.\n"); // printk("xmurp-ua warning, something maybe wrong.\n");
return NF_ACCEPT; return NF_ACCEPT;
} }
iph = ip_hdr(skb); iph = ip_hdr(skb);
if((ntohl(iph->daddr) & 0xffff0000) == 0xc0a80000) if((ntohl(iph->daddr) & 0xffff0000) == 0xc0a80000)
{ {
if(debug_n < 10) // if(debug_n < 10)
printk("xmurp-ua bypass as dst in local net.\n"); // printk("xmurp-ua bypass as dst in local net.\n");
return NF_ACCEPT; return NF_ACCEPT;
} }
if(iph->protocol != IPPROTO_TCP) if(iph->protocol != IPPROTO_TCP)
{ {
if(debug_n < 10) // if(debug_n < 10)
printk("xmurp-ua bypass as protocol not tcp.\n"); // printk("xmurp-ua bypass as protocol not tcp.\n");
return NF_ACCEPT; return NF_ACCEPT;
} }
tcph = tcp_hdr(skb); tcph = tcp_hdr(skb);
if(ntohs(tcph->dest) != 80) if(ntohs(tcph->dest) != 80)
{ {
if(debug_n < 10) // if(debug_n < 10)
printk("xmurp-ua bypass as port %u not 80.\n", ntohs(tcph->dest)); // printk("xmurp-ua bypass as port %u not 80.\n", ntohs(tcph->dest));
return NF_ACCEPT; return NF_ACCEPT;
} }
data_start = (char *)tcph + tcph->doff * 4; data_start = (char *)tcph + tcph->doff * 4;
data_end = (char *)tcph + ntohs(iph->tot_len) - iph->ihl * 4; data_end = (char *)tcph + ntohs(iph->tot_len) - iph->ihl * 4;
debug_n++;
if(data_end - data_start < 4) if(data_end - data_start < 4)
{ {
if(debug_n < 10) 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; return NF_ACCEPT;
} }
if(skb->mark & 0x00000001) if(skb->mark & 0x00000001)