ZeroTierOne/diagnostic/node_state_interfaces_linux.cpp
Aaron Johnson 45e3223591 feat: Add comprehensive JSON diagnostic output with schema validation
Implements structured JSON diagnostic output for node state export with full
schema documentation. This feature provides machine-readable diagnostics for
automated analysis, monitoring, and AI/MCP integration.

Key changes:
- Add `zerotier-cli diagnostic` command for JSON node state export
- Add `zerotier-cli dump -j` as alias for JSON output
- Add `zerotier-cli diagnostic --schema` to print JSON schema
- Implement platform-specific interface collection (Linux, BSD, macOS, Windows)
- Create modular diagnostic/ directory with isolated try/catch error handling
- Add comprehensive JSON schema (diagnostic_schema.json) for validation
- Include build-time schema embedding for offline access
- Add Python and Rust scripts for schema embedding during build
- Update build systems to compile new diagnostic modules

The diagnostic output includes:
- Node configuration and identity
- Network memberships and settings
- Interface states and IP addresses
- Peer connections and statistics
- Moon orbits
- Controller networks (if applicable)

All diagnostic collection is wrapped in try/catch blocks to ensure partial
failures don't prevent overall output generation.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>
2025-07-08 12:40:06 -07:00

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3.3 KiB
C++

#include "diagnostic/node_state_interfaces_linux.hpp"
#include <ifaddrs.h>
#include <net/if.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <cstring>
#include <vector>
void addNodeStateInterfacesJson(nlohmann::json& j) {
try {
std::vector<nlohmann::json> interfaces_json;
struct ifreq ifr;
struct ifconf ifc;
char buf[1024];
char stringBuffer[128];
int sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
ifc.ifc_len = sizeof(buf);
ifc.ifc_buf = buf;
ioctl(sock, SIOCGIFCONF, &ifc);
struct ifreq *it = ifc.ifc_req;
const struct ifreq * const end = it + (ifc.ifc_len / sizeof(struct ifreq));
for(; it != end; ++it) {
strcpy(ifr.ifr_name, it->ifr_name);
if(ioctl(sock, SIOCGIFFLAGS, &ifr) == 0) {
if (!(ifr.ifr_flags & IFF_LOOPBACK)) { // skip loopback
nlohmann::json iface_json;
iface_json["name"] = ifr.ifr_name;
if (ioctl(sock, SIOCGIFMTU, &ifr) == 0) {
iface_json["mtu"] = ifr.ifr_mtu;
}
if (ioctl(sock, SIOCGIFHWADDR, &ifr) == 0) {
unsigned char mac_addr[6];
memcpy(mac_addr, ifr.ifr_hwaddr.sa_data, 6);
char macStr[18];
sprintf(macStr, "%02x:%02x:%02x:%02x:%02x:%02x",
mac_addr[0],
mac_addr[1],
mac_addr[2],
mac_addr[3],
mac_addr[4],
mac_addr[5]);
iface_json["mac"] = macStr;
}
std::vector<std::string> addresses;
struct ifaddrs *ifap, *ifa;
void *addr;
getifaddrs(&ifap);
for(ifa = ifap; ifa; ifa = ifa->ifa_next) {
if(strcmp(ifr.ifr_name, ifa->ifa_name) == 0 && ifa->ifa_addr != NULL) {
if(ifa->ifa_addr->sa_family == AF_INET) {
struct sockaddr_in *ipv4 = (struct sockaddr_in*)ifa->ifa_addr;
addr = &ipv4->sin_addr;
} else if (ifa->ifa_addr->sa_family == AF_INET6) {
struct sockaddr_in6 *ipv6 = (struct sockaddr_in6*)ifa->ifa_addr;
addr = &ipv6->sin6_addr;
} else {
continue;
}
inet_ntop(ifa->ifa_addr->sa_family, addr, stringBuffer, sizeof(stringBuffer));
addresses.push_back(stringBuffer);
}
}
iface_json["addresses"] = addresses;
interfaces_json.push_back(iface_json);
}
}
}
close(sock);
j["network_interfaces"] = interfaces_json;
} catch (const std::exception& e) {
j["network_interfaces"] = std::string("Exception: ") + e.what();
} catch (...) {
j["network_interfaces"] = "Unknown error retrieving interfaces";
}
}