/* $NetBSD: net.c,v 1.20 1997/12/26 22:41:30 scottr Exp $ */ /* * Copyright (c) 1992 Regents of the University of California. * All rights reserved. * * This software was developed by the Computer Systems Engineering group * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and * contributed to Berkeley. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include <sys/param.h> #include <sys/socket.h> #include <string.h> #include <net/if.h> #include <netinet/in.h> #include <netinet/if_ether.h> #include <netinet/in_systm.h> #include <netinet/ip.h> #include <netinet/ip_var.h> #include <netinet/udp.h> #include <netinet/udp_var.h> #include "stand.h" #include "net.h" /* * Maximum wait time for sending and receiving before we give up and timeout. * If set to 0, operations will eventually timeout completely, but send/recv * timeouts must progress exponentially from MINTMO to MAXTMO before final * timeout is hit. */ #ifndef MAXWAIT #define MAXWAIT 300 /* seconds */ #endif #if MAXWAIT < 0 #error MAXWAIT must not be a negative number #endif /* * Send a packet and wait for a reply, with exponential backoff. * * The send routine must return the actual number of bytes written, * or -1 on error. * * The receive routine can indicate success by returning the number of * bytes read; it can return 0 to indicate EOF; it can return -1 with a * non-zero errno to indicate failure; finally, it can return -1 with a * zero errno to indicate it isn't done yet. */ ssize_t sendrecv(struct iodesc *d, ssize_t (*sproc)(struct iodesc *, void *, size_t), void *sbuf, size_t ssize, ssize_t (*rproc)(struct iodesc *, void **, void **, time_t, void *), void **pkt, void **payload, void *recv_extra) { ssize_t cc; time_t t, tmo, tlast; time_t tref; long tleft; #ifdef NET_DEBUG if (debug) printf("sendrecv: called\n"); #endif tmo = MINTMO; tlast = 0; tleft = 0; tref = t = getsecs(); for (;;) { if (MAXWAIT > 0 && (t - tref) >= MAXWAIT) { errno = ETIMEDOUT; return -1; } if (tleft <= 0) { if (tmo >= MAXTMO) { errno = ETIMEDOUT; return -1; } cc = (*sproc)(d, sbuf, ssize); if (cc != -1 && cc < ssize) panic("sendrecv: short write! (%zd < %zd)", cc, ssize); tleft = tmo; tmo += MINTMO; if (tmo > MAXTMO) tmo = MAXTMO; if (cc == -1) { /* Error on transmit; wait before retrying */ while ((getsecs() - t) < tmo) ; tleft = 0; continue; } tlast = t; } /* Try to get a packet and process it. */ cc = (*rproc)(d, pkt, payload, tleft, recv_extra); /* Return on data, EOF or real error. */ if (cc != -1 || (errno != 0 && errno != ETIMEDOUT)) return (cc); /* Timed out or didn't get the packet we're waiting for */ t = getsecs(); tleft -= t - tlast; tlast = t; } } /* * Like inet_addr() in the C library, but we only accept base-10. * Return values are in network order. */ n_long inet_addr(char *cp) { u_long val; int n; char c; u_int parts[4]; u_int *pp = parts; for (;;) { /* * Collect number up to ``.''. * Values are specified as for C: * 0x=hex, 0=octal, other=decimal. */ val = 0; while ((c = *cp) != '\0') { if (c >= '0' && c <= '9') { val = (val * 10) + (c - '0'); cp++; continue; } break; } if (*cp == '.') { /* * Internet format: * a.b.c.d * a.b.c (with c treated as 16-bits) * a.b (with b treated as 24 bits) */ if (pp >= parts + 3 || val > 0xff) goto bad; *pp++ = val, cp++; } else break; } /* * Check for trailing characters. */ if (*cp != '\0') goto bad; /* * Concoct the address according to * the number of parts specified. */ n = pp - parts + 1; switch (n) { case 1: /* a -- 32 bits */ break; case 2: /* a.b -- 8.24 bits */ if (val > 0xffffff) goto bad; val |= parts[0] << 24; break; case 3: /* a.b.c -- 8.8.16 bits */ if (val > 0xffff) goto bad; val |= (parts[0] << 24) | (parts[1] << 16); break; case 4: /* a.b.c.d -- 8.8.8.8 bits */ if (val > 0xff) goto bad; val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8); break; } return (htonl(val)); bad: return (htonl(INADDR_NONE)); } char * inet_ntoa(struct in_addr ia) { return (intoa(ia.s_addr)); } /* Similar to inet_ntoa() */ char * intoa(n_long addr) { char *cp; u_int byte; int n; static char buf[17]; /* strlen(".255.255.255.255") + 1 */ addr = ntohl(addr); cp = &buf[sizeof buf]; *--cp = '\0'; n = 4; do { byte = addr & 0xff; *--cp = byte % 10 + '0'; byte /= 10; if (byte > 0) { *--cp = byte % 10 + '0'; byte /= 10; if (byte > 0) *--cp = byte + '0'; } *--cp = '.'; addr >>= 8; } while (--n > 0); return (cp+1); } static char * number(char *s, n_long *n) { for (*n = 0; isdigit(*s); s++) *n = (*n * 10) + *s - '0'; return s; } n_long ip_convertaddr(char *p) { #define IP_ANYADDR 0 n_long addr = 0, n; if (p == NULL || *p == '\0') return IP_ANYADDR; p = number(p, &n); addr |= (n << 24) & 0xff000000; if (*p == '\0' || *p++ != '.') return IP_ANYADDR; p = number(p, &n); addr |= (n << 16) & 0xff0000; if (*p == '\0' || *p++ != '.') return IP_ANYADDR; p = number(p, &n); addr |= (n << 8) & 0xff00; if (*p == '\0' || *p++ != '.') return IP_ANYADDR; p = number(p, &n); addr |= n & 0xff; if (*p != '\0') return IP_ANYADDR; return htonl(addr); }
