libexec/dma/util.c

   1 /*
   2  * Copyright (c) 2008 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Simon 'corecode' Schubert <corecode@fs.ei.tum.de>.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  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
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include <sys/param.h>
  36 #include <errno.h>
  37 #include <fcntl.h>
  38 #include <netdb.h>
  39 #include <pwd.h>
  40 #include <stdio.h>
  41 #include <syslog.h>
  42 #include <unistd.h>
  43
  44 #include "dma.h"
  45
  46 const char *
  47 hostname(void)
  48 {
  49         static char name[MAXHOSTNAMELEN+1];
  50         int initialized = 0;
  51         FILE *fp;
  52         size_t len;
  53
  54         if (initialized)
  55                 return (name);
  56
  57         if (config->mailname != NULL && config->mailname[0] != '\0') {
  58                 snprintf(name, sizeof(name), "%s", config->mailname);
  59                 initialized = 1;
  60                 return (name);
  61         }
  62         if (config->mailnamefile != NULL && config->mailnamefile[0] != '\0') {
  63                 fp = fopen(config->mailnamefile, "r");
  64                 if (fp != NULL) {
  65                         if (fgets(name, sizeof(name), fp) != NULL) {
  66                                 len = strlen(name);
  67                                 while (len > 0 &&
  68                                     (name[len - 1] == '\r' ||
  69                                      name[len - 1] == '\n'))
  70                                         name[--len] = '\0';
  71                                 if (name[0] != '\0') {
  72                                         initialized = 1;
  73                                         return (name);
  74                                 }
  75                         }
  76                         fclose(fp);
  77                 }
  78         }
  79         if (gethostname(name, sizeof(name)) != 0)
  80                 strcpy(name, "(unknown hostname)");
  81         initialized = 1;
  82         return name;
  83 }
  84
  85 void
  86 setlogident(const char *fmt, ...)
  87 {
  88         char *tag = NULL;
  89
  90         if (fmt != NULL) {
  91                 va_list ap;
  92                 char *sufx;
  93
  94                 va_start(ap, fmt);
  95                 vasprintf(&sufx, fmt, ap);
  96                 if (sufx != NULL) {
  97                         asprintf(&tag, "%s[%s]", logident_base, sufx);
  98                         free(sufx);
  99                 }
 100                 va_end(ap);
 101         }
 102         closelog();
 103         openlog(tag != NULL ? tag : logident_base, 0, LOG_MAIL);
 104 }
 105
 106 void
 107 errlog(int exitcode, const char *fmt, ...)
 108 {
 109         int oerrno = errno;
 110         va_list ap;
 111         char *outs = NULL;
 112
 113         if (fmt != NULL) {
 114                 va_start(ap, fmt);
 115                 vasprintf(&outs, fmt, ap);
 116                 va_end(ap);
 117         }
 118
 119         if (outs != NULL) {
 120                 syslog(LOG_ERR, "%s: %m", outs);
 121                 fprintf(stderr, "%s: %s: %s\n", getprogname(), outs, strerror(oerrno));
 122         } else {
 123                 syslog(LOG_ERR, "%m");
 124                 fprintf(stderr, "%s: %s\n", getprogname(), strerror(oerrno));
 125         }
 126
 127         exit(exitcode);
 128 }
 129
 130 void
 131 errlogx(int exitcode, const char *fmt, ...)
 132 {
 133         va_list ap;
 134         char *outs = NULL;
 135
 136         if (fmt != NULL) {
 137                 va_start(ap, fmt);
 138                 vasprintf(&outs, fmt, ap);
 139                 va_end(ap);
 140         }
 141
 142         if (outs != NULL) {
 143                 syslog(LOG_ERR, "%s", outs);
 144                 fprintf(stderr, "%s: %s\n", getprogname(), outs);
 145         } else {
 146                 syslog(LOG_ERR, "Unknown error");
 147                 fprintf(stderr, "%s: Unknown error\n", getprogname());
 148         }
 149
 150         exit(exitcode);
 151 }
 152
 153 static const char *
 154 check_username(const char *name, uid_t ckuid)
 155 {
 156         struct passwd *pwd;
 157
 158         if (name == NULL)
 159                 return (NULL);
 160         pwd = getpwnam(name);
 161         if (pwd == NULL || pwd->pw_uid != ckuid)
 162                 return (NULL);
 163         return (name);
 164 }
 165
 166 void
 167 set_username(void)
 168 {
 169         struct passwd *pwd;
 170         char *u = NULL;
 171         uid_t uid;
 172
 173         uid = getuid();
 174         username = check_username(getlogin(), uid);
 175         if (username != NULL)
 176                 return;
 177         username = check_username(getenv("LOGNAME"), uid);
 178         if (username != NULL)
 179                 return;
 180         username = check_username(getenv("USER"), uid);
 181         if (username != NULL)
 182                 return;
 183         pwd = getpwuid(uid);
 184         if (pwd != NULL && pwd->pw_name != NULL && pwd->pw_name[0] != '\0' &&
 185             (u = strdup(pwd->pw_name)) != NULL) {
 186                 username = check_username(u, uid);
 187                 if (username != NULL)
 188                         return;
 189                 else
 190                         free(u);
 191         }
 192         asprintf(__DECONST(void *, &username), "%ld", (long)uid);
 193         if (username != NULL)
 194                 return;
 195         username = "unknown-or-invalid-username";
 196 }
 197
 198 void
 199 deltmp(void)
 200 {
 201         struct stritem *t;
 202
 203         SLIST_FOREACH(t, &tmpfs, next) {
 204                 unlink(t->str);
 205         }
 206 }
 207
 208 int
 209 open_locked(const char *fname, int flags, ...)
 210 {
 211         int mode = 0;
 212
 213         if (flags & O_CREAT) {
 214                 va_list ap;
 215                 va_start(ap, flags);
 216                 mode = va_arg(ap, int);
 217                 va_end(ap);
 218         }
 219
 220 #ifndef O_EXLOCK
 221         int fd, save_errno;
 222
 223         fd = open(fname, flags, mode);
 224         if (fd < 0)
 225                 return(fd);
 226         if (flock(fd, LOCK_EX|((flags & O_NONBLOCK)? LOCK_NB: 0)) < 0) {
 227                 save_errno = errno;
 228                 close(fd);
 229                 errno = save_errno;
 230                 return(-1);
 231         }
 232         return(fd);
 233 #else
 234         return(open(fname, flags|O_EXLOCK, mode));
 235 #endif
 236 }
 237
 238 char *
 239 rfc822date(void)
 240 {
 241         static char str[50];
 242         size_t error;
 243         time_t now;
 244
 245         now = time(NULL);
 246         error = strftime(str, sizeof(str), "%a, %d %b %Y %T %z",
 247                        localtime(&now));
 248         if (error == 0)
 249                 strcpy(str, "(date fail)");
 250         return (str);
 251 }
 252
 253 int
 254 strprefixcmp(const char *str, const char *prefix)
 255 {
 256         return (strncasecmp(str, prefix, strlen(prefix)));
 257 }
 258