/* Copyright (C) 1996-2019 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ #include <ctype.h> #include <stdlib.h> #include <string.h> #include <netinet/ether.h> #include <netinet/if_ether.h> int ether_line (const char *line, struct ether_addr *addr, char *hostname) { for (size_t cnt = 0; cnt < 6; ++cnt) { unsigned int number; char ch; ch = _tolower (*line++); if ((ch < '0' || ch > '9') && (ch < 'a' || ch > 'f')) return -1; number = isdigit (ch) ? (ch - '0') : (ch - 'a' + 10); ch = _tolower (*line); if ((cnt < 5 && ch != ':') || (cnt == 5 && ch != '\0' && !isspace (ch))) { ++line; if ((ch < '0' || ch > '9') && (ch < 'a' || ch > 'f')) return -1; number <<= 4; number += isdigit (ch) ? (ch - '0') : (ch - 'a' + 10); ch = *line; if (cnt < 5 && ch != ':') return -1; } /* Store result. */ addr->ether_addr_octet[cnt] = (unsigned char) number; /* Skip ':'. */ if (ch != '\0') ++line; } /* Skip initial whitespace. */ while (isspace (*line)) ++line; if (*line == '#' || *line == '\0') /* No hostname. */ return -1; /* The hostname is up to the next non-space character. */ /* XXX This can cause trouble because the hostname might be too long but we have no possibility to check it here. */ while (*line != '\0' && *line != '#' && !isspace (*line)) *hostname++ = *line++; *hostname = '\0'; return 0; }