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https://github.com/CHN-beta/xmurp-ua.git
synced 2024-10-22 19:38:44 +08:00
avoid unnecessary memory copy.
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parent
e8487aa35b
commit
6a7ec2411f
2
Makefile
2
Makefile
@ -2,7 +2,7 @@ include $(TOPDIR)/rules.mk
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include $(INCLUDE_DIR)/kernel.mk
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PKG_NAME:=xmurp-ua
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PKG_RELEASE:=28
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PKG_RELEASE:=29
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include $(INCLUDE_DIR)/package.mk
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@ -181,6 +181,24 @@ unsigned int hook_funcion(void *priv, struct sk_buff *skb, const struct nf_hook_
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return NF_ACCEPT;
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}
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// 决定是否发送到下一层
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if(catch_next_frag && iph->saddr == saddr && iph->daddr == daddr &&
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tcph->seq == seq && tcph->source == sport && tcph->dest == dport)
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jump_to_next_function = 1;
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else if(data_end - data_start > 3)
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if(memcmp(data_start, "GET", 3) == 0 || memcmp(data_start, "POST", 4) == 0)
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{
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if(catch_next_frag)
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{
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n_ua_modify_faild++;
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char_scan(0);
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catch_next_frag = 0;
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}
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jump_to_next_function = 1;
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}
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if(!jump_to_next_function)
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return NF_ACCEPT;
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// 确保 skb 可以被修改,或者不可以被修改的话把它变得可修改
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if(skb_ensure_writable(skb, (char*)data_end - (char*)skb -> data))
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{
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@ -202,25 +220,6 @@ unsigned int hook_funcion(void *priv, struct sk_buff *skb, const struct nf_hook_
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data_end = (char *)tcph + ntohs(iph->tot_len) - iph->ihl * 4;
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}
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// 决定是否发送到下一层
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if(catch_next_frag && iph->saddr == saddr && iph->daddr == daddr &&
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tcph->seq == seq && tcph->source == sport && tcph->dest == dport)
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jump_to_next_function = 1;
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else if(data_end - data_start > 3)
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if(memcmp(data_start, "GET", 3) == 0 || memcmp(data_start, "POST", 4) == 0)
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{
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if(catch_next_frag)
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{
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n_ua_modify_faild++;
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char_scan(0);
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catch_next_frag = 0;
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}
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jump_to_next_function = 1;
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}
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if(!jump_to_next_function)
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return NF_ACCEPT;
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// 发送到下一层,并回收数据
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ret = skb_scan(data_start, data_end);
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