From c65d99084a5979a34ff3aa504135152b6b31b2bb Mon Sep 17 00:00:00 2001 From: Carmelo Amoroso Date: Thu, 28 Feb 2008 09:56:28 +0000 Subject: Added support for ether_line, ether_ntohost and ether_hostton. Added related test cases. Signed-off-by: Matthew Wilcox Hacked-by: Carmelo Amoroso --- libc/inet/Makefile.in | 2 +- libc/inet/ethers.c | 122 ++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 123 insertions(+), 1 deletion(-) create mode 100755 libc/inet/ethers.c (limited to 'libc') diff --git a/libc/inet/Makefile.in b/libc/inet/Makefile.in index 8cb8661c4..b1ea25b26 100644 --- a/libc/inet/Makefile.in +++ b/libc/inet/Makefile.in @@ -23,7 +23,7 @@ CSRC += encodeh.c decodeh.c encoded.c decoded.c lengthd.c encodeq.c \ res_query.c gethostbyaddr.c read_etc_hosts_r.c get_hosts_byname_r.c \ get_hosts_byaddr_r.c gethostbyname2.c getnameinfo.c gethostent.c \ gethostbyname_r.c gethostbyname2_r.c gethostbyaddr_r.c \ - res_comp.c ns_name.c + res_comp.c ns_name.c ethers.c # unused ATM CSRC += encodep.c decodep.c formquery.c diff --git a/libc/inet/ethers.c b/libc/inet/ethers.c new file mode 100755 index 000000000..857e5d165 --- /dev/null +++ b/libc/inet/ethers.c @@ -0,0 +1,122 @@ +/* + * libc/inet/ethers.c + * + * Programmatic interface for the /etc/ethers file + * + * Copyright 2007 by Matthew Wilcox + * + * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball. + */ + +#include +#include +#include +#include + +#define ETHER_LINE_LEN 256 + +/* + * Internal function which returns a pointer to the part of the line + * with the start of the hostname, or NULL if we couldn't parse the line. + * Note that this line may have a comment symbol on it somewhere; if so + * it will return NULL if the # is before or within the ether_addr, and + * succeed if the # is before or within the host. It's up to the callers + * to be aware of this. + * + * I would have preferred to write a NUL to the location of the comment + * character, but ether_line takes a const argument. See __ether_line_w. + */ +static const char *__ether_line(const char *line, struct ether_addr *addr) +{ + struct ether_addr *res = ether_aton_r(line, addr); + if (!res) + return NULL; + + while (*line && (*line != ' ') && (*line != '\t')) + line++; + while (*line && ((*line == ' ') || (*line == '\t'))) + line++; + return (*line) ? line : NULL; +} + +/* + * Strips out the comment before calling __ether_line. We can do this, + * since we know the buffer is writable. + */ +static const char *__ether_line_w(char *line, struct ether_addr *addr) +{ + char *end = strchr(line, '#'); + if (!end) + end = strchr(line, '\n'); + if (end) + *end = '\0'; + return __ether_line(line, addr); +} + +int ether_line(const char *line, struct ether_addr *addr, char *hostname) +{ + const char *name = __ether_line(line, addr); + if (!name) + return -1; + + while (*name) { + if ((*name == '#') || isspace(*name)) + break; + *hostname++ = *name++; + } + *hostname = '\0'; + + return 0; +} + +int ether_ntohost(char *hostname, const struct ether_addr *addr) +{ + int res = -1; + FILE *fp; + char buf[ETHER_LINE_LEN]; + + fp = fopen(ETHER_FILE_NAME, "r"); + if (!fp) + return -1; + + while (fgets(buf, sizeof(buf), fp)) { + struct ether_addr tmp_addr; + const char *cp = __ether_line_w(buf, &tmp_addr); + if (!cp) + continue; + if (memcmp(addr, &tmp_addr, sizeof(tmp_addr))) + continue; + + strcpy(hostname, cp); + res = 0; + break; + } + + fclose(fp); + return res; +} + +int ether_hostton(const char *hostname, struct ether_addr *addr) +{ + int res = -1; + FILE *fp; + char buf[ETHER_LINE_LEN]; + + fp = fopen(ETHER_FILE_NAME, "r"); + if (!fp) + return -1; + + while (fgets(buf, sizeof(buf), fp)) { + const char *cp = __ether_line_w(buf, addr); + if (!cp) + continue; + if (strcasecmp(hostname, cp)) + continue; + + res = 0; + break; + } + + fclose(fp); + return res; +} -- cgit v1.2.3