crypto/openssh-3.8.1p1/misc.c

   1 /*
   2  * Copyright (c) 2000 Markus Friedl.  All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  14  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  15  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  16  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  17  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  18  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  19  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  20  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  21  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  22  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  23  */
  24
  25 #include "includes.h"
  26 RCSID("$OpenBSD: misc.c,v 1.23 2003/10/28 09:08:06 markus Exp $");
  27
  28 #include "misc.h"
  29 #include "log.h"
  30 #include "xmalloc.h"
  31
  32 /* remove newline at end of string */
  33 char *
  34 chop(char *s)
  35 {
  36         char *t = s;
  37         while (*t) {
  38                 if (*t == '\n' || *t == '\r') {
  39                         *t = '\0';
  40                         return s;
  41                 }
  42                 t++;
  43         }
  44         return s;
  45
  46 }
  47
  48 /* set/unset filedescriptor to non-blocking */
  49 void
  50 set_nonblock(int fd)
  51 {
  52         int val;
  53
  54         val = fcntl(fd, F_GETFL, 0);
  55         if (val < 0) {
  56                 error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno));
  57                 return;
  58         }
  59         if (val & O_NONBLOCK) {
  60                 debug2("fd %d is O_NONBLOCK", fd);
  61                 return;
  62         }
  63         debug2("fd %d setting O_NONBLOCK", fd);
  64         val |= O_NONBLOCK;
  65         if (fcntl(fd, F_SETFL, val) == -1)
  66                 debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s",
  67                     fd, strerror(errno));
  68 }
  69
  70 void
  71 unset_nonblock(int fd)
  72 {
  73         int val;
  74
  75         val = fcntl(fd, F_GETFL, 0);
  76         if (val < 0) {
  77                 error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno));
  78                 return;
  79         }
  80         if (!(val & O_NONBLOCK)) {
  81                 debug2("fd %d is not O_NONBLOCK", fd);
  82                 return;
  83         }
  84         debug("fd %d clearing O_NONBLOCK", fd);
  85         val &= ~O_NONBLOCK;
  86         if (fcntl(fd, F_SETFL, val) == -1)
  87                 debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s",
  88                     fd, strerror(errno));
  89 }
  90
  91 /* disable nagle on socket */
  92 void
  93 set_nodelay(int fd)
  94 {
  95         int opt;
  96         socklen_t optlen;
  97
  98         optlen = sizeof opt;
  99         if (getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen) == -1) {
 100                 debug("getsockopt TCP_NODELAY: %.100s", strerror(errno));
 101                 return;
 102         }
 103         if (opt == 1) {
 104                 debug2("fd %d is TCP_NODELAY", fd);
 105                 return;
 106         }
 107         opt = 1;
 108         debug2("fd %d setting TCP_NODELAY", fd);
 109         if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof opt) == -1)
 110                 error("setsockopt TCP_NODELAY: %.100s", strerror(errno));
 111 }
 112
 113 /* Characters considered whitespace in strsep calls. */
 114 #define WHITESPACE " \t\r\n"
 115
 116 /* return next token in configuration line */
 117 char *
 118 strdelim(char **s)
 119 {
 120         char *old;
 121         int wspace = 0;
 122
 123         if (*s == NULL)
 124                 return NULL;
 125
 126         old = *s;
 127
 128         *s = strpbrk(*s, WHITESPACE "=");
 129         if (*s == NULL)
 130                 return (old);
 131
 132         /* Allow only one '=' to be skipped */
 133         if (*s[0] == '=')
 134                 wspace = 1;
 135         *s[0] = '\0';
 136
 137         *s += strspn(*s + 1, WHITESPACE) + 1;
 138         if (*s[0] == '=' && !wspace)
 139                 *s += strspn(*s + 1, WHITESPACE) + 1;
 140
 141         return (old);
 142 }
 143
 144 struct passwd *
 145 pwcopy(struct passwd *pw)
 146 {
 147         struct passwd *copy = xmalloc(sizeof(*copy));
 148
 149         memset(copy, 0, sizeof(*copy));
 150         copy->pw_name = xstrdup(pw->pw_name);
 151         copy->pw_passwd = xstrdup(pw->pw_passwd);
 152         copy->pw_gecos = xstrdup(pw->pw_gecos);
 153         copy->pw_uid = pw->pw_uid;
 154         copy->pw_gid = pw->pw_gid;
 155 #ifdef HAVE_PW_EXPIRE_IN_PASSWD
 156         copy->pw_expire = pw->pw_expire;
 157 #endif
 158 #ifdef HAVE_PW_CHANGE_IN_PASSWD
 159         copy->pw_change = pw->pw_change;
 160 #endif
 161 #ifdef HAVE_PW_CLASS_IN_PASSWD
 162         copy->pw_class = xstrdup(pw->pw_class);
 163 #endif
 164         copy->pw_dir = xstrdup(pw->pw_dir);
 165         copy->pw_shell = xstrdup(pw->pw_shell);
 166         return copy;
 167 }
 168
 169 /*
 170  * Convert ASCII string to TCP/IP port number.
 171  * Port must be >0 and <=65535.
 172  * Return 0 if invalid.
 173  */
 174 int
 175 a2port(const char *s)
 176 {
 177         long port;
 178         char *endp;
 179
 180         errno = 0;
 181         port = strtol(s, &endp, 0);
 182         if (s == endp || *endp != '\0' ||
 183             (errno == ERANGE && (port == LONG_MIN || port == LONG_MAX)) ||
 184             port <= 0 || port > 65535)
 185                 return 0;
 186
 187         return port;
 188 }
 189
 190 #define SECONDS         1
 191 #define MINUTES         (SECONDS * 60)
 192 #define HOURS           (MINUTES * 60)
 193 #define DAYS            (HOURS * 24)
 194 #define WEEKS           (DAYS * 7)
 195
 196 /*
 197  * Convert a time string into seconds; format is
 198  * a sequence of:
 199  *      time[qualifier]
 200  *
 201  * Valid time qualifiers are:
 202  *      <none>  seconds
 203  *      s|S     seconds
 204  *      m|M     minutes
 205  *      h|H     hours
 206  *      d|D     days
 207  *      w|W     weeks
 208  *
 209  * Examples:
 210  *      90m     90 minutes
 211  *      1h30m   90 minutes
 212  *      2d      2 days
 213  *      1w      1 week
 214  *
 215  * Return -1 if time string is invalid.
 216  */
 217 long
 218 convtime(const char *s)
 219 {
 220         long total, secs;
 221         const char *p;
 222         char *endp;
 223
 224         errno = 0;
 225         total = 0;
 226         p = s;
 227
 228         if (p == NULL || *p == '\0')
 229                 return -1;
 230
 231         while (*p) {
 232                 secs = strtol(p, &endp, 10);
 233                 if (p == endp ||
 234                     (errno == ERANGE && (secs == LONG_MIN || secs == LONG_MAX)) ||
 235                     secs < 0)
 236                         return -1;
 237
 238                 switch (*endp++) {
 239                 case '\0':
 240                         endp--;
 241                 case 's':
 242                 case 'S':
 243                         break;
 244                 case 'm':
 245                 case 'M':
 246                         secs *= MINUTES;
 247                         break;
 248                 case 'h':
 249                 case 'H':
 250                         secs *= HOURS;
 251                         break;
 252                 case 'd':
 253                 case 'D':
 254                         secs *= DAYS;
 255                         break;
 256                 case 'w':
 257                 case 'W':
 258                         secs *= WEEKS;
 259                         break;
 260                 default:
 261                         return -1;
 262                 }
 263                 total += secs;
 264                 if (total < 0)
 265                         return -1;
 266                 p = endp;
 267         }
 268
 269         return total;
 270 }
 271
 272 char *
 273 cleanhostname(char *host)
 274 {
 275         if (*host == '[' && host[strlen(host) - 1] == ']') {
 276                 host[strlen(host) - 1] = '\0';
 277                 return (host + 1);
 278         } else
 279                 return host;
 280 }
 281
 282 char *
 283 colon(char *cp)
 284 {
 285         int flag = 0;
 286
 287         if (*cp == ':')         /* Leading colon is part of file name. */
 288                 return (0);
 289         if (*cp == '[')
 290                 flag = 1;
 291
 292         for (; *cp; ++cp) {
 293                 if (*cp == '@' && *(cp+1) == '[')
 294                         flag = 1;
 295                 if (*cp == ']' && *(cp+1) == ':' && flag)
 296                         return (cp+1);
 297                 if (*cp == ':' && !flag)
 298                         return (cp);
 299                 if (*cp == '/')
 300                         return (0);
 301         }
 302         return (0);
 303 }
 304
 305 /* function to assist building execv() arguments */
 306 void
 307 addargs(arglist *args, char *fmt, ...)
 308 {
 309         va_list ap;
 310         char buf[1024];
 311         int nalloc;
 312
 313         va_start(ap, fmt);
 314         vsnprintf(buf, sizeof(buf), fmt, ap);
 315         va_end(ap);
 316
 317         nalloc = args->nalloc;
 318         if (args->list == NULL) {
 319                 nalloc = 32;
 320                 args->num = 0;
 321         } else if (args->num+2 >= nalloc)
 322                 nalloc *= 2;
 323
 324         args->list = xrealloc(args->list, nalloc * sizeof(char *));
 325         args->nalloc = nalloc;
 326         args->list[args->num++] = xstrdup(buf);
 327         args->list[args->num] = NULL;
 328 }