pplayer【linux环境下】
【博客园原创】http://www.cnblogs.com/baiyan/archive/2013/05/10/pplayer.html
pplayer(packet player)是我写的一款小工具,支持主流协议,专门用来测试IPS和防火墙设备,经长时间验证,简单可靠,故发布。
程序的原理很简单,首先加载pcap包中的数据包,保存在内存中,然后在回放环境中回放数据包。
拓扑:
原理:
防火墙的两个网卡和linux pc的两个网卡分别对接形成环路,pplayer程序运行在linux pc中。
1,加载pcap文件中网路数据包,识别出数据包发送方向(client to server or server to client)
2,修改数据包内容(源/目的ip地址,校验和)
3,按顺序发送数据包,同时接收数据包
4,打印log,提示发送和接收情况,回放完毕。
使用方法:
pplayer -f filename [ -t time] | [-m] | [-v ipversion] | [-p portnum]
可用参数:
-f: 必选,参数是pcap文件名。
-t: 可选,参数是等待接收一个已发送的数据报的时间;如不选默认30(微秒)。
-m: 可选,理想情况下pcap包中只包含两个ip地址的数据包,但是如果存在第3方或3个以上ip地址,就形成了若干的回放关系。
默认情况下,只选择数据包数量最多得一对ip进行回放。如需回放其他ip对的数据包,需要使用-m参数,会以ip对为顺序来回放数据包。
-v: 可选,4或6, 回放IPV4/6数据包, 默认4.
-p: 可选,选择只回放指定端口的数据包,例如,指定回访HTTP包, -p 80。
另外pplayer支持nat环境回放,使用方法见下面配置文件。
举例:
1,./pplayer -f http.pcap(回放http.pcap的数据包)
2, ./pplayer -f http.pcap -v 6 (回放http.pcap的数据包,数据包格式是ipv6)
3,./pplayer -f http.pcap -v 6 -t 50 (回放http.pcap的数据包,数据包格式是ipv6, 每个数据包的等待接收时间设为50微秒)
配置文件:
配置名是conf,和pplayer程序在同一目录下。
格式:
device1:eth0
device2:eth1
device1ip:1.1.1.1
device2ip:2.2.2.2
device1nat:3.3.3.3
device2nat:4.4.4.4
fwmac1:00:0C:29:25:63:6E
fwmac2:00:0C:29:25:63:78
注:冒号后面紧接内容,不能有空格或换行
1.device1和device2表示linxu pc的两个网卡
2.device1ip和device2ip表示linux pc的两个网卡的ip地址
3.device1nat和device2nat是用来支持nat环境回放的。
例如:设备1的ip是1.1.1.1,设备1处于nat环境,转换后的ip是3.3.3.3;
设备2的ip是2.2.2.2,设备2处于nat环境,转换后的ip是4.4.4.4;
如果设备不处于nat环境之中,对应的nat配置项填0.0.0.0(ipv6的填::)
并发/批量回放:
目前pplayer只支持一次回放一个IP对,一次只能回放一个pcap文件,不支持并发和批量回放这两种功能,后续我可能会以shell脚本调用pplayer的方式实现
这两个功能。
核心代码:
void LoadPacket (const struct pcap_pkthdr *pcap_hdr, Trace *trace, Flow *flow, const u_char * data, int pkt_id) { Packet *pkt = NULL; struct ether_header *ph = NULL; struct iphdr *iph = NULL; struct ip6_hdr *iph6 = NULL; struct tcphdr *tcph = NULL; struct udphdr *udph = NULL; if (flow->pkt_cap == 0) { flow->pkt_cap = 64; flow->pkt = calloc(64, sizeof(Packet)); } else if (flow->pkt_num == flow->pkt_cap) { flow->pkt_cap += 64; flow->pkt = realloc(flow->pkt, (flow->pkt_cap) * sizeof(Packet)); } pkt = &flow->pkt[flow->pkt_num]; pkt->id = pkt_id; if (my_file.ipversion == 4) { iph = (struct iphdr *)(data + ETH_HLEN); int offset = (iph->ihl << 2) + ETH_HLEN; tcph = (struct tcphdr *)(data + offset); if (my_file.port != 0 && htons(my_file.port) != tcph->th_dport && htons(my_file.port) != tcph->th_sport) { return; } pkt->len = pcap_hdr->caplen;//ntohs(iph->tot_len) + ETH_HLEN; pkt->buf = malloc(pkt->len + ETHER_CRC_LEN); memcpy(pkt->buf, data, pkt->len); iph = (struct iphdr *)(pkt->buf + ETH_HLEN); } else { iph6 = (struct ip6_hdr *)(data + ETH_HLEN); int offset = 40 + ETH_HLEN; tcph = (struct tcphdr *)(data + offset); if (my_file.port != 0 && htons(my_file.port) != tcph->th_dport && htons(my_file.port) != tcph->th_sport) { return; } pkt->len = pcap_hdr->caplen;//ntohs(iph6->ip6_plen) + 40 + ETH_HLEN; pkt->buf = malloc(pkt->len + ETHER_CRC_LEN); memcpy(pkt->buf, data, pkt->len); iph6 = (struct ip6_hdr *)(pkt->buf + ETH_HLEN); } flow->pkt_num ++; trace->total_pkt_num ++; if (my_file.ipversion == 4) { if (iph->saddr == flow->sv4) { if (my_file.device2_in_nat) { iph->saddr = interface.sv4; iph->daddr = interface.device2nat4; } else { iph->saddr = interface.sv4; iph->daddr = interface.dv4; } pkt->interface = 1; } else { if (my_file.device1_in_nat) { iph->daddr = interface.device1nat4; iph->saddr = interface.dv4; } else { iph->daddr = interface.sv4; iph->saddr = interface.dv4; } pkt->interface = 2; } } else { if (!memcmp(&iph6->ip6_src, flow->sv6, 16)) { if (my_file.device2_in_nat) { memcpy(&iph6->ip6_src, interface.sv6, 16); memcpy(&iph6->ip6_dst, interface.device2nat6, 16); } else { memcpy(&iph6->ip6_src, interface.sv6, 16); memcpy(&iph6->ip6_dst, interface.dv6, 16); } pkt->interface = 1; } else { if (my_file.device1_in_nat) { memcpy(&iph6->ip6_src, interface.device1nat6, 16); memcpy(&iph6->ip6_dst, interface.sv6, 16); } else { memcpy(&iph6->ip6_src, interface.dv6, 16); memcpy(&iph6->ip6_dst, interface.sv6, 16); } pkt->interface = 2; } } if (my_file.ipversion == 4) { ip_csum(iph); if ((iph->frag_off & htons(0x1fff)) == 0) { int offset = (iph->ihl << 2) + ETH_HLEN; if (iph->protocol == IPPROTO_TCP) { tcp_csum(iph, pkt->buf + offset); } else if (iph->protocol == IPPROTO_UDP) { udph = (struct udphdr *)(pkt->buf + offset); if (udph->uh_sum != 0) { udp_csum(iph, (uint8_t *)udph); } } } } else { int offset = 40 + ETH_HLEN; if (iph6->ip6_nxt == IPPROTO_TCP) { tcp_csum6(iph6, pkt->buf + offset, pkt->id); } else if (iph6->ip6_nxt == IPPROTO_UDP) { udp_csum6(iph6, pkt->buf + offset, pkt->id); } } /* * Rewrite the mac addresses on the packet. */ ph = (struct ether_header *)pkt->buf; if (pkt->interface == 1) { ph->ether_shost[0] = interface.device1_mac[0]; ph->ether_shost[1] = interface.device1_mac[1]; ph->ether_shost[2] = interface.device1_mac[2]; ph->ether_shost[3] = interface.device1_mac[3]; ph->ether_shost[4] = interface.device1_mac[4]; ph->ether_shost[5] = interface.device1_mac[5]; ph->ether_dhost[0] = interface.fw_mac1[0]; ph->ether_dhost[1] = interface.fw_mac1[1]; ph->ether_dhost[2] = interface.fw_mac1[2]; ph->ether_dhost[3] = interface.fw_mac1[3]; ph->ether_dhost[4] = interface.fw_mac1[4]; ph->ether_dhost[5] = interface.fw_mac1[5]; } else { ph->ether_dhost[0] = interface.fw_mac2[0]; ph->ether_dhost[1] = interface.fw_mac2[1]; ph->ether_dhost[2] = interface.fw_mac2[2]; ph->ether_dhost[3] = interface.fw_mac2[3]; ph->ether_dhost[4] = interface.fw_mac2[4]; ph->ether_dhost[5] = interface.fw_mac2[5]; ph->ether_shost[0] = interface.device2_mac[0]; ph->ether_shost[1] = interface.device2_mac[1]; ph->ether_shost[2] = interface.device2_mac[2]; ph->ether_shost[3] = interface.device2_mac[3]; ph->ether_shost[4] = interface.device2_mac[4]; ph->ether_shost[5] = interface.device2_mac[5]; } /* Compute the FCS on the Ethernet Frame * Some people say the hardare should do this, but it does not seem to. * Also for packets > 1510, the WriteInterface dies with a message too long error */ /* * This section actually calculates the FCS, but it's not currently * working correctly, so I've commented it out. The CRC32 function * needs to be verified. */ /* if ( pkt->len <= 15 + ETH_HLEN ) { uint32_t newFCS = CRC32( pkt->buf , pkt->len ); memcpy(pkt->buf + pkt->len , &newFCS , ETHER_CRC_LEN); } */ }
可用版本:
红帽9 https://files.cnblogs.com/baiyan/pplayer_redhat9.zip
fedora15 https://files.cnblogs.com/baiyan/pplayer_fedora15.zip
cenos5.5 https://files.cnblogs.com/baiyan/pplayer_centos5.5.zip