diff options
Diffstat (limited to 'src/ip4.c')
| -rw-r--r-- | src/ip4.c | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/src/ip4.c b/src/ip4.c new file mode 100644 index 0000000..9b2047c --- /dev/null +++ b/src/ip4.c @@ -0,0 +1,160 @@ +#include "fmt.h" +#include "scan.h" +#include "str.h" +#include "ip.h" + +/** + * @file ip4.c + * @authors djb, fefe, feh, kp + * @ref ucspi-tcp, ucspi-tcp6 + * @brief handling of IPv4 addresses + */ + +/** + * @brief ip4_fmt + * converts IPv4 address to dotted decimal string format + * @param input: IPv4 char array + * output: IPv4 address string + * @return int length of address (ok > 0) + */ +unsigned int ip4_fmt(char *s,char ip[4]) +{ + unsigned int len; + unsigned int i; + + len = 0; + i = fmt_ulong(s,(unsigned long) (unsigned char) ip[0]); len += i; if (s) s += i; + if (s) { *s++ = '.'; } ++len; + i = fmt_ulong(s,(unsigned long) (unsigned char) ip[1]); len += i; if (s) s += i; + if (s) { *s++ = '.'; } ++len; + i = fmt_ulong(s,(unsigned long) (unsigned char) ip[2]); len += i; if (s) s += i; + if (s) { *s++ = '.'; } ++len; + i = fmt_ulong(s,(unsigned long) (unsigned char) ip[3]); len += i; if (s) s += i; + return len; +} + +/** + * @brief ia4_fmt + * converts IPv4 address into DNS inverse nibble format + * @param input: IPv4 char array + * output: IPv4 address string + * @return int length of address (ok > 0) + */ +unsigned int ia4_fmt(char *s,char ip[4]) +{ + unsigned int i; + unsigned int len; + + len = 0; + i = fmt_ulong(s,(unsigned long) ip[3]); len += i; if (s) s += i; + i = fmt_str(s,"."); len += i; if (s) s += i; + i = fmt_ulong(s,(unsigned long) ip[2]); len += i; if (s) s += i; + i = fmt_str(s,"."); len += i; if (s) s += i; + i = fmt_ulong(s,(unsigned long) ip[1]); len += i; if (s) s += i; + i = fmt_str(s,"."); len += i; if (s) s += i; + i = fmt_ulong(s,(unsigned long) ip[0]); len += i; if (s) s += i; + i = fmt_str(s,".in-addr.arpa."); len += i; if (s) s += i; + return len; +} + +/** + * @brief ip4_scan + * parse IPv4 address string and convert to IP address array + * @param input: IPv4 address string + * output: IPv4 char array + * @return int length of ip_address (ok > 0) + */ +unsigned int ip4_scan(const char *s,char ip[4]) +{ + unsigned int i; + unsigned int len; + unsigned long u; + + byte_zero(ip,4); + len = 0; + i = scan_ulong((char *)s,&u); if (!i) { return 0; } ip[0] = u; s += i; len += i; + if (*s != '.') { return 0; } ++s; ++len; + i = scan_ulong((char *)s,&u); if (!i) { return 0; } ip[1] = u; s += i; len += i; + if (*s != '.') { return 0; } ++s; ++len; + i = scan_ulong((char *)s,&u); if (!i) { return 0; } ip[2] = u; s += i; len += i; + if (*s != '.') { return 0; } ++s; ++len; + i = scan_ulong((char *)s,&u); if (!i) { return 0; } ip[3] = u; s += i; len += i; + return len; +} + +/** + * @brief ip4_scanbracket + * parse IPv4 address string enclosed in brackets and convert to IP address array + * @param input: IPv4 char array + * output: IPv4 char array + * @return int length of ip_address (ok > 0) + */ +unsigned int ip4_scanbracket(const char *s,char ip[4]) +{ + unsigned int len; + + if (*s != '[') return 0; + len = ip4_scan(s + 1,ip); + if (!len) return 0; + if (s[len + 1] != ']') return 0; + return len + 2; +} + +/** + * @brief ip4_cidr + * parse IPv4 address string + * concatinated with the prefix length: 192.168.1/24 + * @param input: IPv6 char array + * output: IPv6 char array, long plen + * @return int length of ip6_address/ip + */ +unsigned int ip4_cidr(char *s,char ip[4],unsigned long *plen) +{ + unsigned int j = 0; + *plen = 32UL; + + j = str_chr(s,'/'); + if (s[j] == '/') { + s[j] = 0; + j = scan_ulong(s + j + 1,plen); + } + return ip4_scan((const char *)s,ip); +} + +/** + * @brief ip4_bytestring + * parse IPv4 address and represent as char string with length prefix + * @param input: IPv4 char array, prefix length + * output: pointer to stralloc bytestring + * @return n: number of bytes, if ok; -1: memory shortage; -2: input error + */ +unsigned int ip4_bytestring(stralloc *ipstring,char ip[4],int prefix) +{ + int i, j, n = 0; + unsigned char number; + + if (!stralloc_readyplus(ipstring,32)) return -1; + if (!stralloc_copys(ipstring,"")) return -1; + + for (i = 0; i < 4; i++) { + number = (unsigned char) ip[i]; + if (number > 255) return -2; + + for (j = 7; j >= 0; j--) { + if (number & (1 << j)) { + n++; + if (!stralloc_cats(ipstring,"1")) return -1; + } else { + n++; + if (!stralloc_cats(ipstring,"0")) return -1; + } + prefix--; + if (!prefix) goto DONE; + } + } + +DONE: + if (!stralloc_0(ipstring)) return 1; + + return n; +} |