X-Git-Url: https://tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fmeta.c;h=e1e1c677ca81fbd75c7c061794f9db13971015de;hp=da090629c579ef31e365faa649c43af4289e364e;hb=69158563e9f790777eb27aeb8484a86d12385af4;hpb=afc05797077641baa33b024ffeaafd6cad3ff7a7 diff --git a/src/meta.c b/src/meta.c index da090629..e1e1c677 100644 --- a/src/meta.c +++ b/src/meta.c @@ -1,7 +1,7 @@ /* meta.c -- handle the meta communication - Copyright (C) 2000 Guus Sliepen , - 2000 Ivo Timmermans + Copyright (C) 2000-2002 Guus Sliepen , + 2000-2002 Ivo Timmermans This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -17,158 +17,190 @@ along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - $Id: meta.c,v 1.1.2.9 2000/11/04 20:44:26 guus Exp $ + $Id: meta.c,v 1.1.2.33 2003/03/19 11:45:05 guus Exp $ */ #include "config.h" #include +#include #include #include -#include -#include -#include #include #include +/* This line must be below the rest for FreeBSD */ +#include +#include + +#include #include "net.h" +#include "connection.h" #include "system.h" #include "protocol.h" -int send_meta(conn_list_t *cl, char *buffer, int length) +int send_meta(connection_t *c, char *buffer, int length) { - char outbuf[MAXBUFSIZE]; - char *bufp; - int outlen; -cp - if(debug_lvl >= DEBUG_META) - syslog(LOG_DEBUG, _("Sending %d bytes of metadata to %s (%s): %s"), length, - cl->name, cl->hostname, buffer); - - buffer[length-1]='\n'; - - if(cl->status.encryptout) - { - EVP_EncryptUpdate(cl->cipher_outctx, outbuf, &outlen, buffer, length); - bufp = outbuf; - length = outlen; - } - else - bufp = buffer; - - if(write(cl->meta_socket, bufp, length) < 0) - { - syslog(LOG_ERR, _("Sending meta data to %s (%s) failed: %m"), cl->name, cl->hostname); - return -1; - } -cp - return 0; + char *bufp; + int outlen; + char outbuf[MAXBUFSIZE]; + int result; + + cp(); + + if(debug_lvl >= DEBUG_META) + syslog(LOG_DEBUG, _("Sending %d bytes of metadata to %s (%s)"), length, + c->name, c->hostname); + + if(c->status.encryptout) { + EVP_EncryptUpdate(c->outctx, outbuf, &outlen, buffer, length); + bufp = outbuf; + length = outlen; + } else + bufp = buffer; + + while(length) { + result = write(c->socket, bufp, length); + if(result <= 0) { + if(errno == EINTR) + continue; + syslog(LOG_ERR, _("Sending meta data to %s (%s) failed: %s"), c->name, + c->hostname, strerror(errno)); + return -1; + } + bufp += result; + length -= result; + } + + return 0; } -int broadcast_meta(conn_list_t *cl, char *buffer, int length) +void broadcast_meta(connection_t *from, char *buffer, int length) { - conn_list_t *p; -cp - for(p = conn_list; p != NULL; p = p->next) - if(p != cl && p->status.meta && p->status.active) - send_meta(p, buffer, length); -cp - return 0; + avl_node_t *node; + connection_t *c; + + cp(); + + for(node = connection_tree->head; node; node = node->next) { + c = (connection_t *) node->data; + + if(c != from && c->status.active) + send_meta(c, buffer, length); + } } -int receive_meta(conn_list_t *cl) +int receive_meta(connection_t *c) { - int x, l = sizeof(x); - int oldlen, i; - int lenin = 0; - char inbuf[MAXBUFSIZE]; - char *bufp; -cp - if(getsockopt(cl->meta_socket, SOL_SOCKET, SO_ERROR, &x, &l) < 0) - { - syslog(LOG_ERR, _("This is a bug: %s:%d: %d:%m %s (%s)"), __FILE__, __LINE__, cl->meta_socket, - cl->name, cl->hostname); - return -1; - } - if(x) - { - syslog(LOG_ERR, _("Metadata socket error for %s (%s): %s"), - cl->name, cl->hostname, strerror(x)); - return -1; - } - - if(cl->status.decryptin) - bufp = inbuf; - else - bufp = cl->buffer + cl->buflen; - - lenin = read(cl->meta_socket, bufp, MAXBUFSIZE - cl->buflen); - - if(lenin<=0) - { - if(errno==EINTR) - return 0; - if(errno==0) - { - if(debug_lvl >= DEBUG_CONNECTIONS) - syslog(LOG_NOTICE, _("Connection closed by %s (%s)"), - cl->name, cl->hostname); - } - else - syslog(LOG_ERR, _("Metadata socket read error for %s (%s): %m"), - cl->name, cl->hostname); - return -1; - } - - if(cl->status.decryptin) - { - EVP_DecryptUpdate(cl->cipher_inctx, cl->buffer + cl->buflen, &lenin, inbuf, lenin); - } - - oldlen = cl->buflen; - cl->buflen += lenin; - - for(;;) - { - cl->reqlen = 0; - - for(i = oldlen; i < cl->buflen; i++) - { - if(cl->buffer[i] == '\n') - { - cl->buffer[i] = 0; /* replace end-of-line by end-of-string so we can use sscanf */ - cl->reqlen = i + 1; - break; - } - } - - if(cl->reqlen) - { - if(debug_lvl >= DEBUG_META) - syslog(LOG_DEBUG, _("Got request from %s (%s): %s"), - cl->name, cl->hostname, cl->buffer); - - if(receive_request(cl)) - return -1; - - cl->buflen -= cl->reqlen; - memmove(cl->buffer, cl->buffer + cl->reqlen, cl->buflen); - oldlen = 0; - } - else - { - break; - } - } - - if(cl->buflen >= MAXBUFSIZE) - { - syslog(LOG_ERR, _("Metadata read buffer overflow for %s (%s)"), - cl->name, cl->hostname); - return -1; - } - - cl->last_ping_time = time(NULL); -cp - return 0; + int x; + socklen_t l = sizeof(x); + int oldlen, i; + int lenin, reqlen; + int decrypted = 0; + char inbuf[MAXBUFSIZE]; + + cp(); + + if(getsockopt(c->socket, SOL_SOCKET, SO_ERROR, &x, &l) < 0) { + syslog(LOG_ERR, _("This is a bug: %s:%d: %d:%s %s (%s)"), __FILE__, + __LINE__, c->socket, strerror(errno), c->name, c->hostname); + return -1; + } + + if(x) { + syslog(LOG_ERR, _("Metadata socket error for %s (%s): %s"), + c->name, c->hostname, strerror(x)); + return -1; + } + + /* Strategy: + - Read as much as possible from the TCP socket in one go. + - Decrypt it. + - Check if a full request is in the input buffer. + - If yes, process request and remove it from the buffer, + then check again. + - If not, keep stuff in buffer and exit. + */ + + lenin = read(c->socket, c->buffer + c->buflen, MAXBUFSIZE - c->buflen); + + if(lenin <= 0) { + if(lenin == 0) { + if(debug_lvl >= DEBUG_CONNECTIONS) + syslog(LOG_NOTICE, _("Connection closed by %s (%s)"), + c->name, c->hostname); + } else if(errno == EINTR) + return 0; + else + syslog(LOG_ERR, _("Metadata socket read error for %s (%s): %s"), + c->name, c->hostname, strerror(errno)); + + return -1; + } + + oldlen = c->buflen; + c->buflen += lenin; + + while(lenin) { + /* Decrypt */ + + if(c->status.decryptin && !decrypted) { + EVP_DecryptUpdate(c->inctx, inbuf, &lenin, c->buffer + oldlen, lenin); + memcpy(c->buffer + oldlen, inbuf, lenin); + decrypted = 1; + } + + /* Are we receiving a TCPpacket? */ + + if(c->tcplen) { + if(c->tcplen <= c->buflen) { + receive_tcppacket(c, c->buffer, c->tcplen); + + c->buflen -= c->tcplen; + lenin -= c->tcplen; + memmove(c->buffer, c->buffer + c->tcplen, c->buflen); + oldlen = 0; + c->tcplen = 0; + continue; + } else { + break; + } + } + + /* Otherwise we are waiting for a request */ + + reqlen = 0; + + for(i = oldlen; i < c->buflen; i++) { + if(c->buffer[i] == '\n') { + c->buffer[i] = '\0'; /* replace end-of-line by end-of-string so we can use sscanf */ + reqlen = i + 1; + break; + } + } + + if(reqlen) { + c->reqlen = reqlen; + if(receive_request(c)) + return -1; + + c->buflen -= reqlen; + lenin -= reqlen; + memmove(c->buffer, c->buffer + reqlen, c->buflen); + oldlen = 0; + continue; + } else { + break; + } + } + + if(c->buflen >= MAXBUFSIZE) { + syslog(LOG_ERR, _("Metadata read buffer overflow for %s (%s)"), + c->name, c->hostname); + return -1; + } + + c->last_ping_time = now; + + return 0; }