ref: 541528252ef042f082c82edf47af7d4947b2f661
dir: /sys/src/libauth/auth_respond.c/
#include <u.h> #include <libc.h> #include <auth.h> #include "authlocal.h" enum { ARgiveup = 100, }; static int dorpc(AuthRpc *rpc, char *verb, char *val, int len, AuthGetkey *getkey) { int ret; for(;;){ if((ret = auth_rpc(rpc, verb, val, len)) != ARneedkey && ret != ARbadkey) return ret; if(getkey == nil) return ARgiveup; /* don't know how */ if((*getkey)(rpc->arg) < 0) return ARgiveup; /* user punted */ } } int auth_respond(void *chal, uint nchal, char *user, uint nuser, void *resp, uint nresp, AuthGetkey *getkey, char *fmt, ...) { char *p, *s; va_list arg; int afd; AuthRpc *rpc; Attr *a; if((afd = open("/mnt/factotum/rpc", ORDWR)) < 0) return -1; if((rpc = auth_allocrpc(afd)) == nil){ close(afd); return -1; } quotefmtinstall(); /* just in case */ va_start(arg, fmt); p = vsmprint(fmt, arg); va_end(arg); if(p==nil || dorpc(rpc, "start", p, strlen(p), getkey) != ARok || dorpc(rpc, "write", chal, nchal, getkey) != ARok || dorpc(rpc, "read", nil, 0, getkey) != ARok){ free(p); close(afd); auth_freerpc(rpc); return -1; } free(p); if(rpc->narg < nresp) nresp = rpc->narg; memmove(resp, rpc->arg, nresp); if((a = auth_attr(rpc)) != nil && (s = _strfindattr(a, "user")) != nil && strlen(s) < nuser) strcpy(user, s); else if(nuser > 0) user[0] = '\0'; _freeattr(a); close(afd); auth_freerpc(rpc); return nresp; }