Date: Mon, 14 Feb 2000 14:33:06 -0800 From: Nathan <nboeger@getrelevant.com> To: darcy@ok-connect.com, "freebsd-net@FreeBSD.ORG" <freebsd-net@FreeBSD.ORG> Subject: Re: HELP ! programing routes ?? Message-ID: <38A882A2.30A31434@getrelevant.com> References: R01YxYj
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darcy@ok-connect.com wrote: > ----- ORIGINAL INTERNET MAIL FOLLOWS 02/14/2000 02:21 PM PST ----- > From: darcy@ok-connect.com > To: nboeger > > Well why not just exec("route add default xxx.xxx.xxx.xxx"); > > At 02:07 PM 2/14/00 -0800, you wrote: > >Sorry if this is a repeat ! > > > > > >I have a question, I need to write a small program that sets the default > > > >gw. It is written in C and I have looked at several way to do it. One > >way is using ioctl but that way seems a little "old" and not very well > >documented. Here is a simple snippet of my code, now when I run it I get > > > >an error "error 22" invalid arg. Does anyone have experience with this > >and can point out what I am doing wrong ? I did have it to where it > >would work but the kernel never added my netmask to the routing table. > >So the route would kinda "hang" their and not do anything. I did tell it > > > >that it was being sent but..... also the flags never where set proper on > > > >the route (when doing route -dvn flush ) > > > > > >Any help would be great ! (oh if this looks familiar, I learned this > >from reading both ruote.c and netstat.c. ) > > > >struct rt_data_msg{ > > struct rt_msghdr add_rtm; > > union{ > > struct sockaddr sa; > > struct sockaddr_in sin; > > struct sockaddr_dl sdl; > > }rt_dst, rt_gate, rt_mask; > >}; > > > >int set_droute(char *gw){ > > > > int sockfd, i, err = 0; > > int flags = 0, r_addrs = 0; > > u_long inits; > > char t_gw[32]; > > register int l; > > struct rt_data_msg add_rt; > > pid_t pid; > > > > /* check to see if we have a gateway address or quit */ > > if(!gw){ > > ERR("set_droute: FREEBSD no route sent ! %d"); > > return(BAD); > > } > > else{ > > /* convet this address if not valid quit */ > > if((inet_aton(gw, &so_gate.sin.sin_addr)) < 0){ > > ERR("set_droute: FREEBSD route not valid ! %d"); > > > > return(BAD); > > } > > } > > > > memset(&add_rt, 0, sizeof(struct rt_data_msg)); > > > > /* check to see if thier is an existing route or not make an > >entry from scratch */ > > if( (i = get_droute(t_gw)) == BAD){ > > > > /* make the address and netmasks */ > > > > if((inet_aton("0.0.0.0", &add_rt.rt_mask.sin.sin_addr)) > >< 0){ err++; } > > if((inet_aton("0.0.0.0", &add_rt.rt_dst.sin.sin_addr)) < > > > >0) { err++; } > > if((inet_aton(gw, &add_rt.rt_gate.sin.sin_addr)) < 0){ > >err++; } > > if(err > 0){ > > ERR("get_droute: FREEBSD cannot set mask or dst > >or gw invalid addresses %d"); > > return(BAD); > > } > > > > inits = RTV_EXPIRE; > > inits |= RTV_RPIPE; > > inits |= RTV_SPIPE; > > inits |= RTV_SSTHRESH; > > > > r_addrs = RTAX_DST; > > r_addrs |= RTAX_GATEWAY; > > r_addrs |= RTAX_NETMASK; > > > > flags = RTF_UP; > > flags |= RTF_GATEWAY; > > flags |= RTF_STATIC; > > flags |= RTF_PRCLONING; > > > > /* add thier size */ > >#define ADD_SIZE(w) l = ROUNDUP(w.sa.sa_len) > >#define ROUNDUP(a) ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) > >: sizeof(long)); > > > > ADD_SIZE(add_rt.rt_dst); > > ADD_SIZE(add_rt.rt_gate); > > ADD_SIZE(add_rt.rt_mask); > > > > /* add their address family */ > >#define ADD_FAM(x) x.sin.sin_family = AF_INET; > > ADD_FAM(add_rt.rt_dst); > > ADD_FAM(add_rt.rt_gate); > > ADD_FAM(add_rt.rt_mask); > > ADD_FAM(add_rt.rt_genmask); > > > > /* set up all of the flags and tables */ > >#define RD add_rt.add_rtm > > RD.rtm_msglen = l; > > RD.rtm_version = RTM_VERSION; > > RD.rtm_type = RTM_ADD; > > RD.rtm_flags = flags; > > RD.rtm_addrs = rtm_addrs; > > RD.rtm_inits = RTF_GATEWAY; > > RD.rtm_pid = pid = getpid(); > > RD.rtm_seq = ++SEQ; > > > > if( (sockfd = socket(PF_ROUTE, SOCK_RAW, 0)) < 0){ > > ERR("set_droute: FREEBSD cannot open socket > >%d"); > > } > > /* send it to the kernel */ > > i = write(sockfd, (char *)&add_rt, l); > > syslog(LOG_ERR, "errno = %d ", errno); > > } > > else{ > > /* get a buffer for the data */ > > ERR("get_droute returned ok %d "); > > } > > > > return(GOOD); > >} > > > > > >Thank you > > > >nathan > > > > > > > >To Unsubscribe: send mail to majordomo@FreeBSD.org > >with "unsubscribe freebsd-net" in the body of the message > > > > Beacuse that would be a security leak and other reasons of the like. What I need to do is be able to set this from within my program with out calling popen or exec ..... Can you see any problems in the code ? thank you nathan To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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