这是一个创建于 1192 天前的主题，其中的信息可能已经有所发展或是发生改变。
struct ifaddrs *ifaddr, *ifa; int family, s; char *host = NULL; for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) { family = ifa->ifa_addr->sa_family; if (family == AF_INET6) { if ((host = malloc(NI_MAXHOST)) == NULL) return NULL; s = getnameinfo(ifa->ifa_addr, sizeof(struct sockaddr_in6), host, NI_MAXHOST, NULL, 0, NI_NUMERICHOST); if (s != 0) { return NULL; } printf("%s %d %s \n\n",ifa->ifa_name,ifaddr->ifa_flags,host); } }  | 1 HarveyLiu 2022-08-26 15:37:11 +08:00 是不是临时地址，不是运营商分配过期时间说了算么 |
 | 2 heyenyan OP @HarveyLiu `ip a`都能标出来 temporary dynamic,我想筛选出来这一个地址。。。但是就是找不到确认的方法 |
 | 3 qakito 2022-08-30 10:18:32 +08:00 可以通过 netlink(ip 命令就是通过 netlink) RTM_NEWADDR, RTM_DELADDR, RTM_GETADDR Add, remove or receive information about an IP address associ ated with an interface. In Linux 2.2, an interface can carry multiple IP addresses, this replaces the alias device concept in 2.0. In Linux 2.2, these messages support IPv4 and IPv6 addresses. They contain an ifaddrmsg structure, optionally fol lowed by rtattr routing attributes. struct ifaddrmsg { unsigned char ifa_family; /* Address type */ unsigned char ifa_prefixlen; /* Prefixlength of address */ unsigned char ifa_flags; /* Address flags */ unsigned char ifa_scope; /* Address scope */ int ifa_index; /* Interface index */ }; ifa_family is the address family type (currently AF_INET or AF_INET6), ifa_prefixlen is the length of the address mask of the address if defined for the family (like for IPv4), ifa_scope is the address scope, ifa_index is the interface index of the interface the address is associated with. ifa_flags is a flag word of IFA_F_SECONDARY for secondary address (old alias inter face), IFA_F_PERMANENT for a permanent address set by the user and other undocumented flags. 判断 ifa_flags & IFA_F_SECONDARY 本地测试 ip -6 addr show 2: ens2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 state UP qlen 1000 inet6 2::cd5b:65df:8ebd:cee8/64 scope global temporary dynamic valid_lft 604458sec preferred_lft 85521sec inet6 2::5054:ff:fe09:9265/64 scope global dynamic mngtmpaddr noprefixroute valid_lft 2591821sec preferred_lft 604621sec inet6 fe80::4d7d:7c1f:9991:fddd/64 scope link stable-privacy valid_lft forever preferred_lft forever ./getaddr new addr ifa flags 1 addr 2::cd5b:65df:8ebd:cee8 <== 临时地址 new addr ifa flags 0 addr 2::5054:ff:fe09:9265 new addr ifa flags 80 addr fe80::4d7d:7c1f:9991:fddd |
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