| File: | src/lib/libc/net/inet_net_ntop.c |
| Warning: | line 131, column 2 Value stored to 'dst' is never read |
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| 1 | /* $OpenBSD: inet_net_ntop.c,v 1.9 2019/07/03 03:24:04 deraadt Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 2012 by Gilles Chehade <gilles@openbsd.org> |
| 5 | * Copyright (c) 1996 by Internet Software Consortium. |
| 6 | * |
| 7 | * Permission to use, copy, modify, and distribute this software for any |
| 8 | * purpose with or without fee is hereby granted, provided that the above |
| 9 | * copyright notice and this permission notice appear in all copies. |
| 10 | * |
| 11 | * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS |
| 12 | * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES |
| 13 | * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE |
| 14 | * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL |
| 15 | * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
| 16 | * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS |
| 17 | * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS |
| 18 | * SOFTWARE. |
| 19 | */ |
| 20 | |
| 21 | #include <sys/types.h> |
| 22 | #include <sys/socket.h> |
| 23 | #include <netinet/in.h> |
| 24 | #include <arpa/inet.h> |
| 25 | |
| 26 | #include <errno(*__errno()).h> |
| 27 | #include <stdio.h> |
| 28 | #include <string.h> |
| 29 | #include <stdlib.h> |
| 30 | |
| 31 | static char *inet_net_ntop_ipv4(const u_char *, int, char *, size_t); |
| 32 | static char *inet_net_ntop_ipv6(const u_char *, int, char *, size_t); |
| 33 | |
| 34 | /* |
| 35 | * char * |
| 36 | * inet_net_ntop(af, src, bits, dst, size) |
| 37 | * convert network number from network to presentation format. |
| 38 | * generates CIDR style result always. |
| 39 | * return: |
| 40 | * pointer to dst, or NULL if an error occurred (check errno). |
| 41 | * author: |
| 42 | * Paul Vixie (ISC), July 1996 |
| 43 | */ |
| 44 | char * |
| 45 | inet_net_ntop(int af, const void *src, int bits, char *dst, size_t size) |
| 46 | { |
| 47 | switch (af) { |
| 48 | case AF_INET2: |
| 49 | return (inet_net_ntop_ipv4(src, bits, dst, size)); |
| 50 | case AF_INET624: |
| 51 | return (inet_net_ntop_ipv6(src, bits, dst, size)); |
| 52 | default: |
| 53 | errno(*__errno()) = EAFNOSUPPORT47; |
| 54 | return (NULL((void *)0)); |
| 55 | } |
| 56 | } |
| 57 | |
| 58 | /* |
| 59 | * static char * |
| 60 | * inet_net_ntop_ipv4(src, bits, dst, size) |
| 61 | * convert IPv4 network number from network to presentation format. |
| 62 | * generates CIDR style result always. |
| 63 | * return: |
| 64 | * pointer to dst, or NULL if an error occurred (check errno). |
| 65 | * note: |
| 66 | * network byte order assumed. this means 192.5.5.240/28 has |
| 67 | * 0x11110000 in its fourth octet. |
| 68 | * author: |
| 69 | * Paul Vixie (ISC), July 1996 |
| 70 | */ |
| 71 | static char * |
| 72 | inet_net_ntop_ipv4(const u_char *src, int bits, char *dst, size_t size) |
| 73 | { |
| 74 | char *odst = dst; |
| 75 | u_int m; |
| 76 | int b; |
| 77 | char *ep; |
| 78 | int advance; |
| 79 | |
| 80 | ep = dst + size; |
| 81 | if (ep <= dst) |
| 82 | goto emsgsize; |
| 83 | |
| 84 | if (bits < 0 || bits > 32) { |
| 85 | errno(*__errno()) = EINVAL22; |
| 86 | return (NULL((void *)0)); |
| 87 | } |
| 88 | if (bits == 0) { |
| 89 | if (ep - dst < sizeof "0") |
| 90 | goto emsgsize; |
| 91 | *dst++ = '0'; |
| 92 | *dst = '\0'; |
| 93 | } |
| 94 | |
| 95 | /* Format whole octets. */ |
| 96 | for (b = bits / 8; b > 0; b--) { |
| 97 | if (ep - dst < sizeof "255.") |
| 98 | goto emsgsize; |
| 99 | advance = snprintf(dst, ep - dst, "%u", *src++); |
| 100 | if (advance <= 0 || advance >= ep - dst) |
| 101 | goto emsgsize; |
| 102 | dst += advance; |
| 103 | if (b > 1) { |
| 104 | if (dst + 1 >= ep) |
| 105 | goto emsgsize; |
| 106 | *dst++ = '.'; |
| 107 | *dst = '\0'; |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | /* Format partial octet. */ |
| 112 | b = bits % 8; |
| 113 | if (b > 0) { |
| 114 | if (ep - dst < sizeof ".255") |
| 115 | goto emsgsize; |
| 116 | if (dst != odst) |
| 117 | *dst++ = '.'; |
| 118 | m = ((1 << b) - 1) << (8 - b); |
| 119 | advance = snprintf(dst, ep - dst, "%u", *src & m); |
| 120 | if (advance <= 0 || advance >= ep - dst) |
| 121 | goto emsgsize; |
| 122 | dst += advance; |
| 123 | } |
| 124 | |
| 125 | /* Format CIDR /width. */ |
| 126 | if (ep - dst < sizeof "/32") |
| 127 | goto emsgsize; |
| 128 | advance = snprintf(dst, ep - dst, "/%u", bits); |
| 129 | if (advance <= 0 || advance >= ep - dst) |
| 130 | goto emsgsize; |
| 131 | dst += advance; |
Value stored to 'dst' is never read | |
| 132 | return (odst); |
| 133 | |
| 134 | emsgsize: |
| 135 | errno(*__errno()) = EMSGSIZE40; |
| 136 | return (NULL((void *)0)); |
| 137 | } |
| 138 | |
| 139 | static char * |
| 140 | inet_net_ntop_ipv6(const u_char *src, int bits, char *dst, size_t size) |
| 141 | { |
| 142 | int ret; |
| 143 | char buf[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255:255:255:255/128")]; |
| 144 | |
| 145 | if (bits < 0 || bits > 128) { |
| 146 | errno(*__errno()) = EINVAL22; |
| 147 | return (NULL((void *)0)); |
| 148 | } |
| 149 | |
| 150 | if (inet_ntop(AF_INET624, src, buf, size) == NULL((void *)0)) |
| 151 | return (NULL((void *)0)); |
| 152 | |
| 153 | ret = snprintf(dst, size, "%s/%d", buf, bits); |
| 154 | if (ret < 0 || ret >= size) { |
| 155 | errno(*__errno()) = EMSGSIZE40; |
| 156 | return (NULL((void *)0)); |
| 157 | } |
| 158 | |
| 159 | return (dst); |
| 160 | } |