Annotation of src/usr.bin/ssh/misc.c, Revision 1.33
1.1 markus 1: /*
2: * Copyright (c) 2000 Markus Friedl. All rights reserved.
1.31 djm 3: * Copyright (c) 2005 Damien Miller. All rights reserved.
1.1 markus 4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: *
14: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24: */
25:
26: #include "includes.h"
1.33 ! djm 27: RCSID("$OpenBSD: misc.c,v 1.32 2005/06/17 02:44:32 djm Exp $");
1.1 markus 28:
29: #include "misc.h"
30: #include "log.h"
1.3 deraadt 31: #include "xmalloc.h"
1.1 markus 32:
1.12 markus 33: /* remove newline at end of string */
1.1 markus 34: char *
35: chop(char *s)
36: {
37: char *t = s;
38: while (*t) {
1.13 deraadt 39: if (*t == '\n' || *t == '\r') {
1.1 markus 40: *t = '\0';
41: return s;
42: }
43: t++;
44: }
45: return s;
46:
47: }
48:
1.12 markus 49: /* set/unset filedescriptor to non-blocking */
1.24 djm 50: int
1.1 markus 51: set_nonblock(int fd)
52: {
53: int val;
1.8 markus 54:
1.1 markus 55: val = fcntl(fd, F_GETFL, 0);
56: if (val < 0) {
57: error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno));
1.24 djm 58: return (-1);
1.1 markus 59: }
60: if (val & O_NONBLOCK) {
1.24 djm 61: debug3("fd %d is O_NONBLOCK", fd);
62: return (0);
1.1 markus 63: }
1.21 markus 64: debug2("fd %d setting O_NONBLOCK", fd);
1.1 markus 65: val |= O_NONBLOCK;
1.24 djm 66: if (fcntl(fd, F_SETFL, val) == -1) {
67: debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s", fd,
68: strerror(errno));
69: return (-1);
70: }
71: return (0);
1.8 markus 72: }
73:
1.24 djm 74: int
1.8 markus 75: unset_nonblock(int fd)
76: {
77: int val;
78:
79: val = fcntl(fd, F_GETFL, 0);
80: if (val < 0) {
81: error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno));
1.24 djm 82: return (-1);
1.8 markus 83: }
84: if (!(val & O_NONBLOCK)) {
1.24 djm 85: debug3("fd %d is not O_NONBLOCK", fd);
86: return (0);
1.8 markus 87: }
1.10 markus 88: debug("fd %d clearing O_NONBLOCK", fd);
1.8 markus 89: val &= ~O_NONBLOCK;
1.24 djm 90: if (fcntl(fd, F_SETFL, val) == -1) {
91: debug("fcntl(%d, F_SETFL, ~O_NONBLOCK): %s",
1.18 markus 92: fd, strerror(errno));
1.24 djm 93: return (-1);
94: }
95: return (0);
1.15 stevesk 96: }
97:
98: /* disable nagle on socket */
99: void
100: set_nodelay(int fd)
101: {
1.17 stevesk 102: int opt;
103: socklen_t optlen;
1.15 stevesk 104:
1.16 stevesk 105: optlen = sizeof opt;
106: if (getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen) == -1) {
1.23 markus 107: debug("getsockopt TCP_NODELAY: %.100s", strerror(errno));
1.16 stevesk 108: return;
109: }
110: if (opt == 1) {
111: debug2("fd %d is TCP_NODELAY", fd);
112: return;
113: }
114: opt = 1;
1.20 markus 115: debug2("fd %d setting TCP_NODELAY", fd);
1.16 stevesk 116: if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof opt) == -1)
1.15 stevesk 117: error("setsockopt TCP_NODELAY: %.100s", strerror(errno));
1.1 markus 118: }
119:
120: /* Characters considered whitespace in strsep calls. */
121: #define WHITESPACE " \t\r\n"
122:
1.12 markus 123: /* return next token in configuration line */
1.1 markus 124: char *
125: strdelim(char **s)
126: {
127: char *old;
128: int wspace = 0;
129:
130: if (*s == NULL)
131: return NULL;
132:
133: old = *s;
134:
135: *s = strpbrk(*s, WHITESPACE "=");
136: if (*s == NULL)
137: return (old);
138:
139: /* Allow only one '=' to be skipped */
140: if (*s[0] == '=')
141: wspace = 1;
142: *s[0] = '\0';
143:
144: *s += strspn(*s + 1, WHITESPACE) + 1;
145: if (*s[0] == '=' && !wspace)
146: *s += strspn(*s + 1, WHITESPACE) + 1;
147:
148: return (old);
1.2 markus 149: }
150:
151: struct passwd *
152: pwcopy(struct passwd *pw)
153: {
154: struct passwd *copy = xmalloc(sizeof(*copy));
1.4 deraadt 155:
1.2 markus 156: memset(copy, 0, sizeof(*copy));
157: copy->pw_name = xstrdup(pw->pw_name);
158: copy->pw_passwd = xstrdup(pw->pw_passwd);
1.4 deraadt 159: copy->pw_gecos = xstrdup(pw->pw_gecos);
1.2 markus 160: copy->pw_uid = pw->pw_uid;
161: copy->pw_gid = pw->pw_gid;
1.11 markus 162: copy->pw_expire = pw->pw_expire;
163: copy->pw_change = pw->pw_change;
1.2 markus 164: copy->pw_class = xstrdup(pw->pw_class);
165: copy->pw_dir = xstrdup(pw->pw_dir);
166: copy->pw_shell = xstrdup(pw->pw_shell);
167: return copy;
1.5 stevesk 168: }
169:
1.12 markus 170: /*
171: * Convert ASCII string to TCP/IP port number.
172: * Port must be >0 and <=65535.
173: * Return 0 if invalid.
174: */
175: int
176: a2port(const char *s)
1.5 stevesk 177: {
178: long port;
179: char *endp;
180:
181: errno = 0;
182: port = strtol(s, &endp, 0);
183: if (s == endp || *endp != '\0' ||
184: (errno == ERANGE && (port == LONG_MIN || port == LONG_MAX)) ||
185: port <= 0 || port > 65535)
186: return 0;
187:
188: return port;
1.9 stevesk 189: }
190:
191: #define SECONDS 1
192: #define MINUTES (SECONDS * 60)
193: #define HOURS (MINUTES * 60)
194: #define DAYS (HOURS * 24)
195: #define WEEKS (DAYS * 7)
196:
1.12 markus 197: /*
198: * Convert a time string into seconds; format is
199: * a sequence of:
200: * time[qualifier]
201: *
202: * Valid time qualifiers are:
203: * <none> seconds
204: * s|S seconds
205: * m|M minutes
206: * h|H hours
207: * d|D days
208: * w|W weeks
209: *
210: * Examples:
211: * 90m 90 minutes
212: * 1h30m 90 minutes
213: * 2d 2 days
214: * 1w 1 week
215: *
216: * Return -1 if time string is invalid.
217: */
218: long
219: convtime(const char *s)
1.9 stevesk 220: {
221: long total, secs;
222: const char *p;
223: char *endp;
224:
225: errno = 0;
226: total = 0;
227: p = s;
228:
229: if (p == NULL || *p == '\0')
230: return -1;
231:
232: while (*p) {
233: secs = strtol(p, &endp, 10);
234: if (p == endp ||
235: (errno == ERANGE && (secs == LONG_MIN || secs == LONG_MAX)) ||
236: secs < 0)
237: return -1;
238:
239: switch (*endp++) {
240: case '\0':
241: endp--;
242: case 's':
243: case 'S':
244: break;
245: case 'm':
246: case 'M':
247: secs *= MINUTES;
248: break;
249: case 'h':
250: case 'H':
251: secs *= HOURS;
252: break;
253: case 'd':
254: case 'D':
255: secs *= DAYS;
256: break;
257: case 'w':
258: case 'W':
259: secs *= WEEKS;
260: break;
261: default:
262: return -1;
263: }
264: total += secs;
265: if (total < 0)
266: return -1;
267: p = endp;
268: }
269:
270: return total;
1.28 djm 271: }
272:
273: /*
274: * Search for next delimiter between hostnames/addresses and ports.
275: * Argument may be modified (for termination).
276: * Returns *cp if parsing succeeds.
277: * *cp is set to the start of the next delimiter, if one was found.
278: * If this is the last field, *cp is set to NULL.
279: */
280: char *
281: hpdelim(char **cp)
282: {
283: char *s, *old;
284:
285: if (cp == NULL || *cp == NULL)
286: return NULL;
287:
288: old = s = *cp;
289: if (*s == '[') {
290: if ((s = strchr(s, ']')) == NULL)
291: return NULL;
292: else
293: s++;
294: } else if ((s = strpbrk(s, ":/")) == NULL)
295: s = *cp + strlen(*cp); /* skip to end (see first case below) */
296:
297: switch (*s) {
298: case '\0':
299: *cp = NULL; /* no more fields*/
300: break;
1.29 deraadt 301:
1.28 djm 302: case ':':
303: case '/':
304: *s = '\0'; /* terminate */
305: *cp = s + 1;
306: break;
1.29 deraadt 307:
1.28 djm 308: default:
309: return NULL;
310: }
311:
312: return old;
1.6 mouring 313: }
314:
315: char *
316: cleanhostname(char *host)
317: {
318: if (*host == '[' && host[strlen(host) - 1] == ']') {
319: host[strlen(host) - 1] = '\0';
320: return (host + 1);
321: } else
322: return host;
323: }
324:
325: char *
326: colon(char *cp)
327: {
328: int flag = 0;
329:
330: if (*cp == ':') /* Leading colon is part of file name. */
331: return (0);
332: if (*cp == '[')
333: flag = 1;
334:
335: for (; *cp; ++cp) {
336: if (*cp == '@' && *(cp+1) == '[')
337: flag = 1;
338: if (*cp == ']' && *(cp+1) == ':' && flag)
339: return (cp+1);
340: if (*cp == ':' && !flag)
341: return (cp);
342: if (*cp == '/')
343: return (0);
344: }
345: return (0);
1.7 mouring 346: }
347:
1.12 markus 348: /* function to assist building execv() arguments */
1.7 mouring 349: void
350: addargs(arglist *args, char *fmt, ...)
351: {
352: va_list ap;
353: char buf[1024];
1.25 avsm 354: u_int nalloc;
1.7 mouring 355:
356: va_start(ap, fmt);
357: vsnprintf(buf, sizeof(buf), fmt, ap);
358: va_end(ap);
359:
1.22 markus 360: nalloc = args->nalloc;
1.7 mouring 361: if (args->list == NULL) {
1.22 markus 362: nalloc = 32;
1.7 mouring 363: args->num = 0;
1.22 markus 364: } else if (args->num+2 >= nalloc)
365: nalloc *= 2;
1.7 mouring 366:
1.22 markus 367: args->list = xrealloc(args->list, nalloc * sizeof(char *));
368: args->nalloc = nalloc;
1.7 mouring 369: args->list[args->num++] = xstrdup(buf);
370: args->list[args->num] = NULL;
1.30 djm 371: }
372:
373: /*
374: * Expands tildes in the file name. Returns data allocated by xmalloc.
375: * Warning: this calls getpw*.
376: */
377: char *
378: tilde_expand_filename(const char *filename, uid_t uid)
379: {
380: const char *path;
381: char user[128], ret[MAXPATHLEN];
382: struct passwd *pw;
1.32 djm 383: u_int len, slash;
1.30 djm 384:
385: if (*filename != '~')
386: return (xstrdup(filename));
387: filename++;
388:
389: path = strchr(filename, '/');
390: if (path != NULL && path > filename) { /* ~user/path */
1.32 djm 391: slash = path - filename;
392: if (slash > sizeof(user) - 1)
1.30 djm 393: fatal("tilde_expand_filename: ~username too long");
1.32 djm 394: memcpy(user, filename, slash);
395: user[slash] = '\0';
1.30 djm 396: if ((pw = getpwnam(user)) == NULL)
397: fatal("tilde_expand_filename: No such user %s", user);
398: } else if ((pw = getpwuid(uid)) == NULL) /* ~/path */
399: fatal("tilde_expand_filename: No such uid %d", uid);
400:
401: if (strlcpy(ret, pw->pw_dir, sizeof(ret)) >= sizeof(ret))
402: fatal("tilde_expand_filename: Path too long");
403:
404: /* Make sure directory has a trailing '/' */
405: len = strlen(pw->pw_dir);
406: if ((len == 0 || pw->pw_dir[len - 1] != '/') &&
407: strlcat(ret, "/", sizeof(ret)) >= sizeof(ret))
408: fatal("tilde_expand_filename: Path too long");
409:
410: /* Skip leading '/' from specified path */
411: if (path != NULL)
412: filename = path + 1;
413: if (strlcat(ret, filename, sizeof(ret)) >= sizeof(ret))
414: fatal("tilde_expand_filename: Path too long");
415:
416: return (xstrdup(ret));
1.31 djm 417: }
418:
419: /*
420: * Expand a string with a set of %[char] escapes. A number of escapes may be
421: * specified as (char *escape_chars, char *replacement) pairs. The list must
422: * be terminated by an escape_char of -1. Returns replaced string in memory
423: * allocated by xmalloc.
424: */
425: char *
426: percent_expand(const char *string, ...)
427: {
428: #define EXPAND_MAX_KEYS 16
429: struct {
430: const char *key;
431: const char *repl;
432: } keys[EXPAND_MAX_KEYS];
1.32 djm 433: u_int num_keys, i, j;
1.31 djm 434: char buf[4096];
435: va_list ap;
436:
437: /* Gather keys */
438: va_start(ap, string);
439: for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) {
440: keys[num_keys].key = va_arg(ap, char *);
441: if (keys[num_keys].key == NULL)
442: break;
443: keys[num_keys].repl = va_arg(ap, char *);
444: if (keys[num_keys].repl == NULL)
445: fatal("percent_expand: NULL replacement");
446: }
447: va_end(ap);
448:
449: if (num_keys >= EXPAND_MAX_KEYS)
450: fatal("percent_expand: too many keys");
451:
452: /* Expand string */
453: *buf = '\0';
454: for (i = 0; *string != '\0'; string++) {
455: if (*string != '%') {
456: append:
457: buf[i++] = *string;
458: if (i >= sizeof(buf))
459: fatal("percent_expand: string too long");
460: buf[i] = '\0';
461: continue;
462: }
463: string++;
464: if (*string == '%')
465: goto append;
466: for (j = 0; j < num_keys; j++) {
467: if (strchr(keys[j].key, *string) != NULL) {
468: i = strlcat(buf, keys[j].repl, sizeof(buf));
469: if (i >= sizeof(buf))
470: fatal("percent_expand: string too long");
471: break;
472: }
473: }
474: if (j >= num_keys)
475: fatal("percent_expand: unknown key %%%c", *string);
476: }
477: return (xstrdup(buf));
478: #undef EXPAND_MAX_KEYS
1.26 dtucker 479: }
480:
481: /*
482: * Read an entire line from a public key file into a static buffer, discarding
483: * lines that exceed the buffer size. Returns 0 on success, -1 on failure.
484: */
485: int
486: read_keyfile_line(FILE *f, const char *filename, char *buf, size_t bufsz,
1.27 dtucker 487: u_long *lineno)
1.26 dtucker 488: {
489: while (fgets(buf, bufsz, f) != NULL) {
490: (*lineno)++;
491: if (buf[strlen(buf) - 1] == '\n' || feof(f)) {
492: return 0;
493: } else {
1.27 dtucker 494: debug("%s: %s line %lu exceeds size limit", __func__,
495: filename, *lineno);
1.26 dtucker 496: /* discard remainder of line */
1.29 deraadt 497: while (fgetc(f) != '\n' && !feof(f))
1.26 dtucker 498: ; /* nothing */
499: }
500: }
501: return -1;
1.1 markus 502: }
1.33 ! djm 503:
! 504: char *
! 505: tohex(const u_char *d, u_int l)
! 506: {
! 507: char b[3], *r;
! 508: u_int i, hl;
! 509:
! 510: hl = l * 2 + 1;
! 511: r = xmalloc(hl);
! 512: *r = '\0';
! 513: for (i = 0; i < l; i++) {
! 514: snprintf(b, sizeof(b), "%02x", d[i]);
! 515: strlcat(r, b, hl);
! 516: }
! 517: return (r);
! 518: }
! 519:
![[BACK]](/icons/back.gif){kind=icon}
Return to misc.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / ssh