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Diffstat (limited to 'src/compat.c')
| -rw-r--r-- | src/compat.c | 281 |
1 files changed, 281 insertions, 0 deletions
diff --git a/src/compat.c b/src/compat.c new file mode 100644 index 0000000..8bd6add --- /dev/null +++ b/src/compat.c @@ -0,0 +1,281 @@ +/* + * Dropbear - a SSH2 server + * + * Copyright (c) 2002,2003 Matt Johnston + * All rights reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + * + * strlcat() is copyright as follows: + * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, + * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY + * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL + * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; + * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, + * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR + * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF + * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * daemon() and getusershell() is copyright as follows: + * + * Copyright (c) 1990, 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +* SUCH DAMAGE. +* +* Modifications for Dropbear to getusershell() are by Paul Marinceu +*/ + +#include "includes.h" + +#ifndef HAVE_GETUSERSHELL +static char **curshell, **shells, *strings; +static char **initshells(); +#endif + +#ifndef HAVE_STRLCPY +/* Implemented by matt as specified in freebsd 4.7 manpage. + * We don't require great speed, is simply for use with sshpty code */ +size_t strlcpy(char *dst, const char *src, size_t size) { + + size_t i; + + /* this is undefined, though size==0 -> return 0 */ + if (size < 1) { + return 0; + } + + for (i = 0; i < size-1; i++) { + if (src[i] == '\0') { + break; + } else { + dst[i] = src[i]; + } + } + + dst[i] = '\0'; + return strlen(src); + +} +#endif /* HAVE_STRLCPY */ + +#ifndef HAVE_STRLCAT +/* taken from openbsd-compat for OpenSSH 7.2p2 */ +/* "$OpenBSD: strlcat.c,v 1.13 2005/08/08 08:05:37 espie Exp $" + * + * Appends src to string dst of size siz (unlike strncat, siz is the + * full size of dst, not space left). At most siz-1 characters + * will be copied. Always NUL terminates (unless siz <= strlen(dst)). + * Returns strlen(src) + MIN(siz, strlen(initial dst)). + * If retval >= siz, truncation occurred. + */ +size_t +strlcat(char *dst, const char *src, size_t siz) +{ + char *d = dst; + const char *s = src; + size_t n = siz; + size_t dlen; + + /* Find the end of dst and adjust bytes left but don't go past end */ + while (n-- != 0 && *d != '\0') + d++; + dlen = d - dst; + n = siz - dlen; + + if (n == 0) + return(dlen + strlen(s)); + while (*s != '\0') { + if (n != 1) { + *d++ = *s; + n--; + } + s++; + } + *d = '\0'; + + return(dlen + (s - src)); /* count does not include NUL */ +} +#endif /* HAVE_STRLCAT */ + +#ifndef HAVE_DAEMON +/* From NetBSD - daemonise a process */ + +int daemon(int nochdir, int noclose) { + + int fd; + + switch (fork()) { + case -1: + return (-1); + case 0: + break; + default: + _exit(0); + } + + if (setsid() == -1) + return -1; + + if (!nochdir) + (void)chdir("/"); + + if (!noclose && (fd = open(DROPBEAR_PATH_DEVNULL, O_RDWR, 0)) != -1) { + (void)dup2(fd, STDIN_FILENO); + (void)dup2(fd, STDOUT_FILENO); + (void)dup2(fd, STDERR_FILENO); + if (fd > STDERR_FILENO) + (void)close(fd); + } + return 0; +} +#endif /* HAVE_DAEMON */ + +#ifndef HAVE_BASENAME + +char *basename(const char *path) { + + char *foo = strrchr(path, '/'); + if (!foo) + { + return path; + } + return ++foo; +} + +#endif /* HAVE_BASENAME */ + +#ifndef HAVE_GETUSERSHELL + +/* + * Get a list of shells from /etc/shells, if it exists. + */ +char * getusershell() { + char *ret; + + if (curshell == NULL) + curshell = initshells(); + ret = *curshell; + if (ret != NULL) + curshell++; + return (ret); +} + +void endusershell() { + + if (shells != NULL) + free(shells); + shells = NULL; + if (strings != NULL) + free(strings); + strings = NULL; + curshell = NULL; +} + +void setusershell() { + curshell = initshells(); +} + +static char **initshells() { + static const char *okshells[] = { COMPAT_USER_SHELLS, NULL }; + register char **sp, *cp; + register FILE *fp; + struct stat statb; + int flen; + + if (shells != NULL) + free(shells); + shells = NULL; + if (strings != NULL) + free(strings); + strings = NULL; + if ((fp = fopen("/etc/shells", "rc")) == NULL) + return (char **) okshells; + if (fstat(fileno(fp), &statb) == -1) { + (void)fclose(fp); + return (char **) okshells; + } + if ((strings = malloc((u_int)statb.st_size + 1)) == NULL) { + (void)fclose(fp); + return (char **) okshells; + } + shells = calloc((unsigned)statb.st_size / 3, sizeof (char *)); + if (shells == NULL) { + (void)fclose(fp); + free(strings); + strings = NULL; + return (char **) okshells; + } + sp = shells; + cp = strings; + flen = statb.st_size; + while (fgets(cp, flen - (cp - strings), fp) != NULL) { + while (*cp != '#' && *cp != '/' && *cp != '\0') + cp++; + if (*cp == '#' || *cp == '\0') + continue; + *sp++ = cp; + while (!isspace(*cp) && *cp != '#' && *cp != '\0') + cp++; + *cp++ = '\0'; + } + *sp = NULL; + (void)fclose(fp); + return (shells); +} + +#endif /* HAVE_GETUSERSHELL */ |