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Annotation of embedaddon/dnsmasq/src/outpacket.c, revision 1.1.1.4

1.1.1.4 ! misho       1: /* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
1.1       misho       2: 
                      3:    This program is free software; you can redistribute it and/or modify
                      4:    it under the terms of the GNU General Public License as published by
                      5:    the Free Software Foundation; version 2 dated June, 1991, or
                      6:    (at your option) version 3 dated 29 June, 2007.
                      7:  
                      8:    This program is distributed in the hope that it will be useful,
                      9:    but WITHOUT ANY WARRANTY; without even the implied warranty of
                     10:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     11:    GNU General Public License for more details.
                     12:      
                     13:    You should have received a copy of the GNU General Public License
                     14:    along with this program.  If not, see <http://www.gnu.org/licenses/>.
                     15: */
                     16: 
                     17: 
                     18: #include "dnsmasq.h"
                     19:  
                     20: #ifdef HAVE_DHCP6
                     21: 
                     22: static size_t outpacket_counter;
                     23: 
                     24: void end_opt6(int container)
                     25: {
                     26:    void *p = daemon->outpacket.iov_base + container + 2;
                     27:    u16 len = outpacket_counter - container - 4 ;
                     28:    
                     29:    PUTSHORT(len, p);
                     30: }
                     31: 
1.1.1.4 ! misho      32: void reset_counter(void)
        !            33: {
        !            34:   /* Clear out buffer when starting from beginning */
        !            35:   if (daemon->outpacket.iov_base)
        !            36:     memset(daemon->outpacket.iov_base, 0, daemon->outpacket.iov_len);
        !            37:  
        !            38:   save_counter(0);
        !            39: }
        !            40: 
1.1       misho      41: int save_counter(int newval)
                     42: {
                     43:   int ret = outpacket_counter;
1.1.1.4 ! misho      44:   
1.1       misho      45:   if (newval != -1)
                     46:     outpacket_counter = newval;
                     47: 
                     48:   return ret;
                     49: }
                     50: 
                     51: void *expand(size_t headroom)
                     52: {
                     53:   void *ret;
                     54: 
                     55:   if (expand_buf(&daemon->outpacket, outpacket_counter + headroom))
                     56:     {
                     57:       ret = daemon->outpacket.iov_base + outpacket_counter;
                     58:       outpacket_counter += headroom;
                     59:       return ret;
                     60:     }
                     61:   
                     62:   return NULL;
                     63: }
                     64:     
                     65: int new_opt6(int opt)
                     66: {
                     67:   int ret = outpacket_counter;
                     68:   void *p;
                     69: 
                     70:   if ((p = expand(4)))
                     71:     {
                     72:       PUTSHORT(opt, p);
                     73:       PUTSHORT(0, p);
                     74:     }
                     75: 
                     76:   return ret;
                     77: }
                     78: 
                     79: void *put_opt6(void *data, size_t len)
                     80: {
                     81:   void *p;
                     82: 
1.1.1.2   misho      83:   if ((p = expand(len)) && data)
1.1       misho      84:     memcpy(p, data, len);   
1.1.1.2   misho      85:   
1.1       misho      86:   return p;
                     87: }
                     88:   
                     89: void put_opt6_long(unsigned int val)
                     90: {
                     91:   void *p;
                     92:   
                     93:   if ((p = expand(4)))  
                     94:     PUTLONG(val, p);
                     95: }
                     96: 
                     97: void put_opt6_short(unsigned int val)
                     98: {
                     99:   void *p;
                    100: 
                    101:   if ((p = expand(2)))
                    102:     PUTSHORT(val, p);   
                    103: }
                    104: 
                    105: void put_opt6_char(unsigned int val)
                    106: {
                    107:   unsigned char *p;
                    108: 
                    109:   if ((p = expand(1)))
                    110:     *p = val;   
                    111: }
                    112: 
                    113: void put_opt6_string(char *s)
                    114: {
                    115:   put_opt6(s, strlen(s));
                    116: }
                    117: 
                    118: #endif