src/parse.c (693f1e8) - libetherpix · BlinkenArea

parse.c

/*
 * EtherPix library
 *
 * Copyright 2010-2017 Stefan Schuermans <stefan schuermans info>
 *
 * 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
 * the Free Software Foundation, version 3 of the License.
 *
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

#include <stdlib.h>
#include <string.h>

#include "net.h"
#include "parse.h"

/**
 * \brief parse two comma-separated numbers
 *
 * \param[in] text text to parse
 * \param[out] no1 first number parsed from text
 * \param[out] no2 second number parsed from text
 * \param[out] end location in text where parsing ended
 * \return 0 in case of success, -1 in case of error
 */
int etp_parse_two_nos(char *text, unsigned int *no1, unsigned int *no2,
                      char **end)
{
  char *ptr1, *ptr2;
  unsigned long val1, val2;

/* parse first number */
  val1 = strtoul(text, &ptr1, 0);
  if (ptr1 == text || *ptr1 != ',')
    return -1;

/* skip comma */
  ptr1++;

/* parse second number */
  val2 = strtoul(ptr1, &ptr2, 0);
  if (ptr2 == ptr1
      || (*ptr2 != 0 && *ptr2 != ' ' && *ptr2 != '\t' && *ptr2 != '\r'
          && *ptr2 != '\n'))
    return -1;

/* return numbers and pointer behind end */
  *no1 = (unsigned int)val1;
  *no2 = (unsigned int)val2;
  *end = ptr2;
  return 0;
}

/**
 * \brief parse an address
 *
 * \param[in] test test to parse
 * \param[out] addr address parsed from text
 * \return 0 in case of success, -1 in case of error
 */
int etp_parse_addr(char *text, struct sockaddr_in *addr)
{
  char *p_colon, *p_host, *p_port, *p_port_end;
  in_addr_t ip;
  unsigned long port;
  struct hostent *p_hostent;

/* split address into IP and port */
  p_colon = strchr(text, ':');
  if (p_colon) {
    *p_colon = 0;
    p_host = text;
    p_port = p_colon + 1;
  } else {
    p_host = text;
    p_port = text + strlen(text);
  }

/* parse host */
  ip = inet_addr(p_host);
  if (ip == htonl(INADDR_NONE)) {
    /* try to resolve host */
    p_hostent = gethostbyname(p_host);
    if (!p_hostent || !p_hostent->h_addr_list || !p_hostent->h_addr_list[0]) {
      /* restore text before leaving */
      if (p_colon)
        *p_colon = ':';
      return -1;
    }
    ip = *(in_addr_t *)p_hostent->h_addr_list[0];
  }

/* parse port */
  port = strtoul(p_port, &p_port_end, 0);
  if (*p_port_end ||   /* not all characters of port were valid */
      port > 65535) {  /* invalid port number */
    /* restore text before leaving */
    if (p_colon)
      *p_colon = ':';
    return -1;
  }

/* construct address */
  addr->sin_family = AF_INET;
  addr->sin_port = htons((in_port_t) port);
  addr->sin_addr.s_addr = ip;

/* restore text before leaving */
  if (p_colon)
    *p_colon = ':';
  return 0;
}

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