On 2016-03-15, Lambrecht Jürgen <j.lambre...@televic.com> wrote: > On 02/23/2016 04:59 PM, Grant Edwards wrote:
>> I just re-ran my tests and verified again that I'm able to set the IP >> and netmask in a single call to ioctl(SIOCAIFADDR). In my tests, I >> tried: >> >> Address Netmask >> ----------- -------------- >> 11.0.0.104 255.0.0.0 >> 11.0.0.104 255.255.0.0 >> 11.0.0.104 255.255.255.0 >> 11.0.0.104 255.240.0.0 > OK, now I see it: you use > SIOCAIFADDR > we use > SIOCSIFADDR > (from http://sourceware.org/ml/ecos-discuss/2005-08/msg00015.html) Yes. > Where did you learn to use SIOCAIFADDR? When I was writing a DHCPv6 implimentation, I had found some example code somewhere that used SIOCAIFADDR_IN6. So, I grepped the stack source for SIOCAIFADDR. Below is the function I was using during my testing. The 's' parameter is a UDP socket file descriptor. void addInterfaceAddress4(int s, uint32_t ip4addr, uint32_t netmask) { struct in_aliasreq ifra; struct sockaddr_in *addrp, *maskp; memset(&ifra, 0, sizeof ifra); strcpy(ifra.ifra_name, "eth0"); addrp = (struct sockaddr_in *) &ifra.ifra_addr; memset(addrp, 0, sizeof(*addrp)); addrp->sin_family = AF_INET; addrp->sin_len = sizeof(*addrp); addrp->sin_port = 0; maskp = (struct sockaddr_in *) &ifra.ifra_mask; memset(maskp, 0, sizeof(*maskp)); maskp->sin_family = AF_INET; maskp->sin_len = sizeof(*maskp); maskp->sin_port = 0; addrp->sin_addr.s_addr = htonl(ip4addr); maskp->sin_addr.s_addr = htonl(netmask); if (ioctl(s, SIOCAIFADDR, &ifra)) diag_printf("Error setting second 'eth0' IP address (SIOCAIFADDR): %s\n", strerror(errno)); } I just noticed that the memset(addrp,...) and memset(maskp,...) calls are redundant (not needed). -- Grant Edwards grant.b.edwards Yow! ... My pants just went at on a wild rampage through a gmail.com Long Island Bowling Alley!! -- Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss
