53 lines
1.3 KiB
C
53 lines
1.3 KiB
C
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#include <errno.h>
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#include <string.h>
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#include <syscall.h>
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#include <sys/socket.h>
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#include "netlink.h"
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static int __netlink_enumerate(int fd, unsigned int seq, int type, int af,
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int (*cb)(void *ctx, struct nlmsghdr *h), void *ctx)
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{
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struct nlmsghdr *h;
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union {
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uint8_t buf[8192];
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struct {
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struct nlmsghdr nlh;
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struct rtgenmsg g;
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} req;
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struct nlmsghdr reply;
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} u;
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int r, ret;
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memset(&u.req, 0, sizeof(u.req));
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u.req.nlh.nlmsg_len = sizeof(u.req);
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u.req.nlh.nlmsg_type = type;
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u.req.nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST;
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u.req.nlh.nlmsg_seq = seq;
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u.req.g.rtgen_family = af;
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r = send(fd, &u.req, sizeof(u.req), 0);
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if (r < 0) return r;
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while (1) {
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r = recv(fd, u.buf, sizeof(u.buf), MSG_DONTWAIT);
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if (r <= 0) return -1;
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for (h = &u.reply; NLMSG_OK(h, (void*)&u.buf[r]); h = NLMSG_NEXT(h)) {
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if (h->nlmsg_type == NLMSG_DONE) return 0;
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if (h->nlmsg_type == NLMSG_ERROR) return -1;
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ret = cb(ctx, h);
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if (ret) return ret;
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}
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}
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}
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int __rtnetlink_enumerate(int link_af, int addr_af, int (*cb)(void *ctx, struct nlmsghdr *h), void *ctx)
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{
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int fd, r;
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fd = socket(PF_NETLINK, SOCK_RAW|SOCK_CLOEXEC, NETLINK_ROUTE);
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if (fd < 0) return -1;
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r = __netlink_enumerate(fd, 1, RTM_GETLINK, link_af, cb, ctx);
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if (!r) r = __netlink_enumerate(fd, 2, RTM_GETADDR, addr_af, cb, ctx);
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__syscall(SYS_close,fd);
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return r;
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}
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