1 /* 2 * Copyright (C) 2004 3 * Hartmut Brandt. 4 * All rights reserved. 5 * 6 * Author: Harti Brandt <harti@freebsd.org> 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $Begemot: bsnmp/lib/support.c,v 1.1 2004/08/06 08:47:58 brandt Exp $ 30 * 31 * Functions that are missing on certain systems. 32 */ 33 #include <stdio.h> 34 #include <stdlib.h> 35 #include <stdarg.h> 36 #include <errno.h> 37 #include <string.h> 38 #include "support.h" 39 40 #ifndef HAVE_ERR_H 41 42 void 43 warnx(const char *fmt, ...) 44 { 45 va_list ap; 46 47 va_start(ap, fmt); 48 fprintf(stderr, "warning: "); 49 vfprintf(stderr, fmt, ap); 50 fprintf(stderr, "\n"); 51 va_end(ap); 52 } 53 54 void 55 warn(const char *fmt, ...) 56 { 57 va_list ap; 58 int e = errno; 59 60 va_start(ap, fmt); 61 fprintf(stderr, "warning: "); 62 vfprintf(stderr, fmt, ap); 63 fprintf(stderr, ": %s\n", strerror(e)); 64 va_end(ap); 65 } 66 67 void 68 errx(int code, const char *fmt, ...) 69 { 70 va_list ap; 71 72 va_start(ap, fmt); 73 fprintf(stderr, "error: "); 74 vfprintf(stderr, fmt, ap); 75 fprintf(stderr, "\n"); 76 va_end(ap); 77 exit(code); 78 } 79 80 void 81 err(int code, const char *fmt, ...) 82 { 83 va_list ap; 84 int e = errno; 85 86 va_start(ap, fmt); 87 fprintf(stderr, "error: "); 88 vfprintf(stderr, fmt, ap); 89 fprintf(stderr, ": %s\n", strerror(e)); 90 va_end(ap); 91 exit(code); 92 } 93 94 #endif 95 96 #ifndef HAVE_STRLCPY 97 98 size_t 99 strlcpy(char *dst, const char *src, size_t len) 100 { 101 size_t ret = strlen(dst); 102 103 while (len > 1) { 104 *dst++ = *src++; 105 len--; 106 } 107 if (len > 0) 108 *dst = '\0'; 109 return (ret); 110 } 111 112 #endif 113 114 #ifndef HAVE_GETADDRINFO 115 116 #include <sys/types.h> 117 #include <sys/socket.h> 118 #include <netinet/in.h> 119 #include <netdb.h> 120 121 extern int h_nerr; 122 extern int h_errno; 123 extern const char *h_errlist[]; 124 125 /* 126 * VERY poor man's implementation 127 */ 128 int 129 getaddrinfo(const char *host, const char *port, const struct addrinfo *hints, 130 struct addrinfo **res) 131 { 132 struct hostent *hent; 133 struct sockaddr_in *s; 134 struct servent *sent; 135 136 if ((hent = gethostbyname(host)) == NULL) 137 return (h_errno); 138 if (hent->h_addrtype != hints->ai_family) 139 return (HOST_NOT_FOUND); 140 if (hent->h_addrtype != AF_INET) 141 return (HOST_NOT_FOUND); 142 143 if ((*res = malloc(sizeof(**res))) == NULL) 144 return (HOST_NOT_FOUND); 145 146 (*res)->ai_flags = hints->ai_flags; 147 (*res)->ai_family = hints->ai_family; 148 (*res)->ai_socktype = hints->ai_socktype; 149 (*res)->ai_protocol = hints->ai_protocol; 150 (*res)->ai_next = NULL; 151 152 if (((*res)->ai_addr = malloc(sizeof(struct sockaddr_in))) == NULL) { 153 freeaddrinfo(*res); 154 return (HOST_NOT_FOUND); 155 } 156 (*res)->ai_addrlen = sizeof(struct sockaddr_in); 157 s = (struct sockaddr_in *)(*res)->ai_addr; 158 s->sin_family = hints->ai_family; 159 s->sin_len = sizeof(*s); 160 memcpy(&s->sin_addr, hent->h_addr, 4); 161 162 if ((sent = getservbyname(port, NULL)) == NULL) { 163 freeaddrinfo(*res); 164 return (HOST_NOT_FOUND); 165 } 166 s->sin_port = sent->s_port; 167 168 return (0); 169 } 170 171 const char * 172 gai_strerror(int e) 173 { 174 175 if (e < 0 || e >= h_nerr) 176 return ("unknown error"); 177 return (h_errlist[e]); 178 } 179 180 void 181 freeaddrinfo(struct addrinfo *p) 182 { 183 struct addrinfo *next; 184 185 while (p != NULL) { 186 next = p->ai_next; 187 if (p->ai_addr != NULL) 188 free(p->ai_addr); 189 free(p); 190 p = next; 191 } 192 } 193 194 #endif 195