{"id":22004897,"url":"https://github.com/revsic/packetinjector","last_synced_at":"2025-05-05T17:33:38.182Z","repository":{"id":140177580,"uuid":"65907620","full_name":"revsic/PacketInjector","owner":"revsic","description":"Detect HTTP packet and inject redirect packet","archived":false,"fork":false,"pushed_at":"2018-03-01T14:07:29.000Z","size":8,"stargazers_count":14,"open_issues_count":0,"forks_count":10,"subscribers_count":2,"default_branch":"master","last_synced_at":"2025-05-05T17:31:52.622Z","etag":null,"topics":["injection","packet","packet-injection"],"latest_commit_sha":null,"homepage":"","language":"C++","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":"mit","status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/revsic.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":null,"funding":null,"license":"LICENSE","code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null,"governance":null,"roadmap":null,"authors":null,"dei":null,"publiccode":null,"codemeta":null,"zenodo":null}},"created_at":"2016-08-17T12:57:22.000Z","updated_at":"2025-01-14T07:02:39.000Z","dependencies_parsed_at":null,"dependency_job_id":"c66f6815-1d08-4d3e-98b3-c83a9225c68d","html_url":"https://github.com/revsic/PacketInjector","commit_stats":null,"previous_names":[],"tags_count":0,"template":false,"template_full_name":null,"repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/revsic%2FPacketInjector","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/revsic%2FPacketInjector/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/revsic%2FPacketInjector/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/revsic%2FPacketInjector/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/revsic","download_url":"https://codeload.github.com/revsic/PacketInjector/tar.gz/refs/heads/master","host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":252542400,"owners_count":21764961,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2022-07-04T15:15:14.044Z","host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":["injection","packet","packet-injection"],"created_at":"2024-11-30T00:17:28.206Z","updated_at":"2025-05-05T17:33:38.170Z","avatar_url":"https://github.com/revsic.png","language":"C++","funding_links":[],"categories":[],"sub_categories":[],"readme":"# Packet-Injection\n\nDetect specific packet and inject forward or backward\n\n1. Detect specific packet : ex) HTTP GET\n```cpp\nif (tcp.phdr-\u003etcp_dport == TCP_PORT_HTTP) {\n    if (tcp.pdat.length \u0026\u0026 !strncmp((char *)tcp.pdat.data, \"GET\", 3)) {\n        char *tmp = strchr((char *)tcp.pdat.data, '\\n');\n\n        if (tmp) *tmp = '\\0';\n        std::cout \u003c\u003c \"[*] blocked : \" \u003c\u003c tcp.pdat.data \u003c\u003c std::endl;\n\n        injectForward(ip, tcp);\n        injectBackward(eth, ip, tcp);\n    }\n}\n```\n\n2. inject forward or backward : ex) HTTP 302 redirect, fin or rst flag packet\n```cpp\nint PacketInjector::injectForward(IPv4\u0026 ip, TCP\u0026 tcp) {\n    u_int32_t seqtmp = tcp.phdr-\u003etcp_seq_num;\n    tcp.phdr-\u003etcp_seq_num = htonl(ntohl(seqtmp) + tcp.pdat.length);\n\n    int ip_len = setProperty(ip, tcp, TCP_FLAG_RST, \"\");\n    int total_len = ETHER_HEAD_LEN + ip_len;\n    int result = pcap_sendpacket(handle, packet, total_len);\n\n    tcp.phdr-\u003etcp_seq_num = seqtmp;\n    tcp.phdr-\u003etcp_flags ^= TCP_FLAG_RST;\n\n    return result;\n}\n```\n\n```cpp\nint PacketInjector::injectBackward(Ethernet\u0026 eth, IPv4\u0026 ip, TCP\u0026 tcp) {\n  for (int i = 0; i \u003c ETHER_ADDR_LEN; ++i) {\n    u_int8_t etmp = eth.phdr-\u003eether_dhost[i];\n    eth.phdr-\u003eether_dhost[i] = eth.phdr-\u003eether_shost[i];\n    eth.phdr-\u003eether_shost[i] = etmp;\n  }\n\n  struct in_addr itmp = ip.phdr-\u003eip_dst;\n  ip.phdr-\u003eip_dst = ip.phdr-\u003eip_src;\n  ip.phdr-\u003eip_src = itmp;\n\n  u_int16_t ptmp = tcp.phdr-\u003etcp_dport;\n  tcp.phdr-\u003etcp_dport = tcp.phdr-\u003etcp_sport;\n  tcp.phdr-\u003etcp_sport = ptmp;\n\n  u_int32_t atmp = tcp.phdr-\u003etcp_ack_num;\n  tcp.phdr-\u003etcp_ack_num = htonl(ntohl(tcp.phdr-\u003etcp_seq_num) + tcp.pdat.length);\n  tcp.phdr-\u003etcp_seq_num = atmp;\n\n  int ip_len = setProperty(ip, tcp, TCP_FLAG_FIN, BLOCK_MSG);\n  int total_len = ETHER_HEAD_LEN + ip_len;\n  int result = pcap_sendpacket(handle, packet, total_len);\n\n  return result;\n}\n```\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Frevsic%2Fpacketinjector","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Frevsic%2Fpacketinjector","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Frevsic%2Fpacketinjector/lists"}