diff options
Diffstat (limited to 'pppd/utils.c')
-rw-r--r-- | pppd/utils.c | 1053 |
1 files changed, 0 insertions, 1053 deletions
diff --git a/pppd/utils.c b/pppd/utils.c deleted file mode 100644 index 80cc292..0000000 --- a/pppd/utils.c +++ /dev/null @@ -1,1053 +0,0 @@ -/* - * utils.c - various utility functions used in pppd. - * - * Copyright (c) 1999-2002 Paul Mackerras. 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. The name(s) of the authors of this software must not be used to - * endorse or promote products derived from this software without - * prior written permission. - * - * 3. Redistributions of any form whatsoever must retain the following - * acknowledgment: - * "This product includes software developed by Paul Mackerras - * <paulus@samba.org>". - * - * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO - * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY - * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY - * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES - * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN - * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING - * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. - */ - -#define RCSID "$Id: utils.c,v 1.25 2008/06/03 12:06:37 paulus Exp $" - -#include <stdio.h> -#include <ctype.h> -#include <stdlib.h> -#include <string.h> -#include <unistd.h> -#include <signal.h> -#include <errno.h> -#include <fcntl.h> -#include <syslog.h> -#include <netdb.h> -#include <time.h> -#include <utmp.h> -#include <pwd.h> -#include <sys/param.h> -#include <sys/types.h> -#include <sys/wait.h> -#include <sys/time.h> -#include <sys/resource.h> -#include <sys/stat.h> -#include <sys/socket.h> -#include <netinet/in.h> -#ifdef SVR4 -#include <sys/mkdev.h> -#endif - -#include "pppd.h" -#include "fsm.h" -#include "lcp.h" - -static const char rcsid[] = RCSID; - -#if defined(SUNOS4) -extern char *strerror(); -#endif - -static void logit __P((int, char *, va_list)); -static void log_write __P((int, char *)); -static void vslp_printer __P((void *, char *, ...)); -static void format_packet __P((u_char *, int, printer_func, void *)); - -struct buffer_info { - char *ptr; - int len; -}; - -#if !defined(__ANDROID__) - -/* - * strlcpy - like strcpy/strncpy, doesn't overflow destination buffer, - * always leaves destination null-terminated (for len > 0). - */ -size_t -strlcpy(dest, src, len) - char *dest; - const char *src; - size_t len; -{ - size_t ret = strlen(src); - - if (len != 0) { - if (ret < len) - strcpy(dest, src); - else { - strncpy(dest, src, len - 1); - dest[len-1] = 0; - } - } - return ret; -} - -/* - * strlcat - like strcat/strncat, doesn't overflow destination buffer, - * always leaves destination null-terminated (for len > 0). - */ -size_t -strlcat(dest, src, len) - char *dest; - const char *src; - size_t len; -{ - size_t dlen = strlen(dest); - - return dlen + strlcpy(dest + dlen, src, (len > dlen? len - dlen: 0)); -} -#endif - - -/* - * slprintf - format a message into a buffer. Like sprintf except we - * also specify the length of the output buffer, and we handle - * %m (error message), %v (visible string), - * %q (quoted string), %t (current time) and %I (IP address) formats. - * Doesn't do floating-point formats. - * Returns the number of chars put into buf. - */ -int -slprintf __V((char *buf, int buflen, char *fmt, ...)) -{ - va_list args; - int n; - -#if defined(__STDC__) - va_start(args, fmt); -#else - char *buf; - int buflen; - char *fmt; - va_start(args); - buf = va_arg(args, char *); - buflen = va_arg(args, int); - fmt = va_arg(args, char *); -#endif - n = vslprintf(buf, buflen, fmt, args); - va_end(args); - return n; -} - -/* - * vslprintf - like slprintf, takes a va_list instead of a list of args. - */ -#define OUTCHAR(c) (buflen > 0? (--buflen, *buf++ = (c)): 0) - -int -vslprintf(buf, buflen, fmt, args) - char *buf; - int buflen; - char *fmt; - va_list args; -{ - int c, i, n; - int width, prec, fillch; - int base, len, neg, quoted; - unsigned long val = 0; - char *str, *f, *buf0; - unsigned char *p; - char num[32]; - time_t t; - u_int32_t ip; - static char hexchars[] = "0123456789abcdef"; - struct buffer_info bufinfo; - - buf0 = buf; - --buflen; - while (buflen > 0) { - for (f = fmt; *f != '%' && *f != 0; ++f) - ; - if (f > fmt) { - len = f - fmt; - if (len > buflen) - len = buflen; - memcpy(buf, fmt, len); - buf += len; - buflen -= len; - fmt = f; - } - if (*fmt == 0) - break; - c = *++fmt; - width = 0; - prec = -1; - fillch = ' '; - if (c == '0') { - fillch = '0'; - c = *++fmt; - } - if (c == '*') { - width = va_arg(args, int); - c = *++fmt; - } else { - while (isdigit(c)) { - width = width * 10 + c - '0'; - c = *++fmt; - } - } - if (c == '.') { - c = *++fmt; - if (c == '*') { - prec = va_arg(args, int); - c = *++fmt; - } else { - prec = 0; - while (isdigit(c)) { - prec = prec * 10 + c - '0'; - c = *++fmt; - } - } - } - str = 0; - base = 0; - neg = 0; - ++fmt; - switch (c) { - case 'l': - c = *fmt++; - switch (c) { - case 'd': - val = va_arg(args, long); -#if defined(__ANDROID__) - if ((long)val < 0) { - neg = 1; - val = (unsigned long)(-(long)val); - } -#else - if (val < 0) { - neg = 1; - val = -val; - } -#endif - base = 10; - break; - case 'u': - val = va_arg(args, unsigned long); - base = 10; - break; - default: - OUTCHAR('%'); - OUTCHAR('l'); - --fmt; /* so %lz outputs %lz etc. */ - continue; - } - break; - case 'd': - i = va_arg(args, int); - if (i < 0) { - neg = 1; - val = -i; - } else - val = i; - base = 10; - break; - case 'u': - val = va_arg(args, unsigned int); - base = 10; - break; - case 'o': - val = va_arg(args, unsigned int); - base = 8; - break; - case 'x': - case 'X': - val = va_arg(args, unsigned int); - base = 16; - break; - case 'p': - val = (unsigned long) va_arg(args, void *); - base = 16; - neg = 2; - break; - case 's': - str = va_arg(args, char *); - break; - case 'c': - num[0] = va_arg(args, int); - num[1] = 0; - str = num; - break; - case 'm': - str = strerror(errno); - break; - case 'I': - ip = va_arg(args, u_int32_t); - ip = ntohl(ip); - slprintf(num, sizeof(num), "%d.%d.%d.%d", (ip >> 24) & 0xff, - (ip >> 16) & 0xff, (ip >> 8) & 0xff, ip & 0xff); - str = num; - break; - case 't': - time(&t); - str = ctime(&t); - str += 4; /* chop off the day name */ - str[15] = 0; /* chop off year and newline */ - break; - case 'v': /* "visible" string */ - case 'q': /* quoted string */ - quoted = c == 'q'; - p = va_arg(args, unsigned char *); - if (p == NULL) - p = (unsigned char *)"<NULL>"; - if (fillch == '0' && prec >= 0) { - n = prec; - } else { - if (prec >= 0) { - n = strnlen((char *)p, prec); - } else { - n = strlen((char *)p); - } - } - while (n > 0 && buflen > 0) { - c = *p++; - --n; - if (!quoted && c >= 0x80) { - OUTCHAR('M'); - OUTCHAR('-'); - c -= 0x80; - } - if (quoted && (c == '"' || c == '\\')) - OUTCHAR('\\'); - if (c < 0x20 || (0x7f <= c && c < 0xa0)) { - if (quoted) { - OUTCHAR('\\'); - switch (c) { - case '\t': OUTCHAR('t'); break; - case '\n': OUTCHAR('n'); break; - case '\b': OUTCHAR('b'); break; - case '\f': OUTCHAR('f'); break; - default: - OUTCHAR('x'); - OUTCHAR(hexchars[c >> 4]); - OUTCHAR(hexchars[c & 0xf]); - } - } else { - if (c == '\t') - OUTCHAR(c); - else { - OUTCHAR('^'); - OUTCHAR(c ^ 0x40); - } - } - } else - OUTCHAR(c); - } - continue; - case 'P': /* print PPP packet */ - bufinfo.ptr = buf; - bufinfo.len = buflen + 1; - p = va_arg(args, unsigned char *); - n = va_arg(args, int); - format_packet(p, n, vslp_printer, &bufinfo); - buf = bufinfo.ptr; - buflen = bufinfo.len - 1; - continue; - case 'B': - p = va_arg(args, unsigned char *); - for (n = prec; n > 0; --n) { - c = *p++; - if (fillch == ' ') - OUTCHAR(' '); - OUTCHAR(hexchars[(c >> 4) & 0xf]); - OUTCHAR(hexchars[c & 0xf]); - } - continue; - default: - *buf++ = '%'; - if (c != '%') - --fmt; /* so %z outputs %z etc. */ - --buflen; - continue; - } - if (base != 0) { - str = num + sizeof(num); - *--str = 0; - while (str > num + neg) { - *--str = hexchars[val % base]; - val = val / base; - if (--prec <= 0 && val == 0) - break; - } - switch (neg) { - case 1: - *--str = '-'; - break; - case 2: - *--str = 'x'; - *--str = '0'; - break; - } - len = num + sizeof(num) - 1 - str; - } else { - len = strlen(str); - if (prec >= 0 && len > prec) - len = prec; - } - if (width > 0) { - if (width > buflen) - width = buflen; - if ((n = width - len) > 0) { - buflen -= n; - for (; n > 0; --n) - *buf++ = fillch; - } - } - if (len > buflen) - len = buflen; - memcpy(buf, str, len); - buf += len; - buflen -= len; - } - *buf = 0; - return buf - buf0; -} - -/* - * vslp_printer - used in processing a %P format - */ -static void -vslp_printer __V((void *arg, char *fmt, ...)) -{ - int n; - va_list pvar; - struct buffer_info *bi; - -#if defined(__STDC__) - va_start(pvar, fmt); -#else - void *arg; - char *fmt; - va_start(pvar); - arg = va_arg(pvar, void *); - fmt = va_arg(pvar, char *); -#endif - - bi = (struct buffer_info *) arg; - n = vslprintf(bi->ptr, bi->len, fmt, pvar); - va_end(pvar); - - bi->ptr += n; - bi->len -= n; -} - -#ifdef unused -/* - * log_packet - format a packet and log it. - */ - -void -log_packet(p, len, prefix, level) - u_char *p; - int len; - char *prefix; - int level; -{ - init_pr_log(prefix, level); - format_packet(p, len, pr_log, &level); - end_pr_log(); -} -#endif /* unused */ - -/* - * format_packet - make a readable representation of a packet, - * calling `printer(arg, format, ...)' to output it. - */ -static void -format_packet(p, len, printer, arg) - u_char *p; - int len; - printer_func printer; - void *arg; -{ - int i, n; - u_short proto; - struct protent *protp; - - if (len >= PPP_HDRLEN && p[0] == PPP_ALLSTATIONS && p[1] == PPP_UI) { - p += 2; - GETSHORT(proto, p); - len -= PPP_HDRLEN; - for (i = 0; (protp = protocols[i]) != NULL; ++i) - if (proto == protp->protocol) - break; - if (protp != NULL) { - printer(arg, "[%s", protp->name); - n = (*protp->printpkt)(p, len, printer, arg); - printer(arg, "]"); - p += n; - len -= n; - } else { - for (i = 0; (protp = protocols[i]) != NULL; ++i) - if (proto == (protp->protocol & ~0x8000)) - break; - if (protp != 0 && protp->data_name != 0) { - printer(arg, "[%s data]", protp->data_name); - if (len > 8) - printer(arg, "%.8B ...", p); - else - printer(arg, "%.*B", len, p); - len = 0; - } else - printer(arg, "[proto=0x%x]", proto); - } - } - - if (len > 32) - printer(arg, "%.32B ...", p); - else - printer(arg, "%.*B", len, p); -} - -/* - * init_pr_log, end_pr_log - initialize and finish use of pr_log. - */ - -static char line[256]; /* line to be logged accumulated here */ -static char *linep; /* current pointer within line */ -static int llevel; /* level for logging */ - -void -init_pr_log(prefix, level) - const char *prefix; - int level; -{ - linep = line; - if (prefix != NULL) { - strlcpy(line, prefix, sizeof(line)); - linep = line + strlen(line); - } - llevel = level; -} - -void -end_pr_log() -{ - if (linep != line) { - *linep = 0; - log_write(llevel, line); - } -} - -/* - * pr_log - printer routine for outputting to syslog - */ -void -pr_log __V((void *arg, char *fmt, ...)) -{ - int l, n; - va_list pvar; - char *p, *eol; - char buf[256]; - -#if defined(__STDC__) - va_start(pvar, fmt); -#else - void *arg; - char *fmt; - va_start(pvar); - arg = va_arg(pvar, void *); - fmt = va_arg(pvar, char *); -#endif - - n = vslprintf(buf, sizeof(buf), fmt, pvar); - va_end(pvar); - - p = buf; - eol = strchr(buf, '\n'); - if (linep != line) { - l = (eol == NULL)? n: eol - buf; - if (linep + l < line + sizeof(line)) { - if (l > 0) { - memcpy(linep, buf, l); - linep += l; - } - if (eol == NULL) - return; - p = eol + 1; - eol = strchr(p, '\n'); - } - *linep = 0; - log_write(llevel, line); - linep = line; - } - - while (eol != NULL) { - *eol = 0; - log_write(llevel, p); - p = eol + 1; - eol = strchr(p, '\n'); - } - - /* assumes sizeof(buf) <= sizeof(line) */ - l = buf + n - p; - if (l > 0) { - memcpy(line, p, n); - linep = line + l; - } -} - -/* - * print_string - print a readable representation of a string using - * printer. - */ -void -print_string(p, len, printer, arg) - char *p; - int len; - printer_func printer; - void *arg; -{ - int c; - - printer(arg, "\""); - for (; len > 0; --len) { - c = *p++; - if (' ' <= c && c <= '~') { - if (c == '\\' || c == '"') - printer(arg, "\\"); - printer(arg, "%c", c); - } else { - switch (c) { - case '\n': - printer(arg, "\\n"); - break; - case '\r': - printer(arg, "\\r"); - break; - case '\t': - printer(arg, "\\t"); - break; - default: - printer(arg, "\\%.3o", c); - } - } - } - printer(arg, "\""); -} - -/* - * logit - does the hard work for fatal et al. - */ -static void -logit(level, fmt, args) - int level; - char *fmt; - va_list args; -{ - char buf[1024]; - - vslprintf(buf, sizeof(buf), fmt, args); - log_write(level, buf); -} - -static void -log_write(level, buf) - int level; - char *buf; -{ - syslog(level, "%s", buf); - if (log_to_fd >= 0 && (level != LOG_DEBUG || debug)) { - int n = strlen(buf); - - if (n > 0 && buf[n-1] == '\n') - --n; - if (write(log_to_fd, buf, n) != n - || write(log_to_fd, "\n", 1) != 1) - log_to_fd = -1; - } -} - -/* - * fatal - log an error message and die horribly. - */ -void -fatal __V((char *fmt, ...)) -{ - va_list pvar; - -#if defined(__STDC__) - va_start(pvar, fmt); -#else - char *fmt; - va_start(pvar); - fmt = va_arg(pvar, char *); -#endif - - logit(LOG_ERR, fmt, pvar); - va_end(pvar); - - die(1); /* as promised */ -} - -/* - * error - log an error message. - */ -void -error __V((char *fmt, ...)) -{ - va_list pvar; - -#if defined(__STDC__) - va_start(pvar, fmt); -#else - char *fmt; - va_start(pvar); - fmt = va_arg(pvar, char *); -#endif - - logit(LOG_ERR, fmt, pvar); - va_end(pvar); - ++error_count; -} - -/* - * warn - log a warning message. - */ -void -warn __V((char *fmt, ...)) -{ - va_list pvar; - -#if defined(__STDC__) - va_start(pvar, fmt); -#else - char *fmt; - va_start(pvar); - fmt = va_arg(pvar, char *); -#endif - - logit(LOG_WARNING, fmt, pvar); - va_end(pvar); -} - -/* - * notice - log a notice-level message. - */ -void -notice __V((char *fmt, ...)) -{ - va_list pvar; - -#if defined(__STDC__) - va_start(pvar, fmt); -#else - char *fmt; - va_start(pvar); - fmt = va_arg(pvar, char *); -#endif - - logit(LOG_NOTICE, fmt, pvar); - va_end(pvar); -} - -/* - * info - log an informational message. - */ -void -info __V((char *fmt, ...)) -{ - va_list pvar; - -#if defined(__STDC__) - va_start(pvar, fmt); -#else - char *fmt; - va_start(pvar); - fmt = va_arg(pvar, char *); -#endif - - logit(LOG_INFO, fmt, pvar); - va_end(pvar); -} - -/* - * dbglog - log a debug message. - */ -void -dbglog __V((char *fmt, ...)) -{ - va_list pvar; - -#if defined(__STDC__) - va_start(pvar, fmt); -#else - char *fmt; - va_start(pvar); - fmt = va_arg(pvar, char *); -#endif - - logit(LOG_DEBUG, fmt, pvar); - va_end(pvar); -} - -/* - * dump_packet - print out a packet in readable form if it is interesting. - * Assumes len >= PPP_HDRLEN. - */ -void -dump_packet(const char *tag, unsigned char *p, int len) -{ - int proto; - - if (!debug) - return; - - /* - * don't print LCP echo request/reply packets if debug <= 1 - * and the link is up. - */ - proto = (p[2] << 8) + p[3]; - if (debug <= 1 && unsuccess == 0 && proto == PPP_LCP - && len >= PPP_HDRLEN + HEADERLEN) { - unsigned char *lcp = p + PPP_HDRLEN; - int l = (lcp[2] << 8) + lcp[3]; - - if ((lcp[0] == ECHOREQ || lcp[0] == ECHOREP) - && l >= HEADERLEN && l <= len - PPP_HDRLEN) - return; - } - - dbglog("%s %P", tag, p, len); -} - -/* - * complete_read - read a full `count' bytes from fd, - * unless end-of-file or an error other than EINTR is encountered. - */ -ssize_t -complete_read(int fd, void *buf, size_t count) -{ - size_t done; - ssize_t nb; - char *ptr = buf; - - for (done = 0; done < count; ) { - nb = read(fd, ptr, count - done); - if (nb < 0) { - if (errno == EINTR) - continue; - return -1; - } - if (nb == 0) - break; - done += nb; - ptr += nb; - } - return done; -} - -/* Procedures for locking the serial device using a lock file. */ -#ifndef LOCK_DIR -#ifdef __linux__ -#define LOCK_DIR "/var/lock" -#else -#ifdef SVR4 -#define LOCK_DIR "/var/spool/locks" -#else -#define LOCK_DIR "/var/spool/lock" -#endif -#endif -#endif /* LOCK_DIR */ - -static char lock_file[MAXPATHLEN]; - -/* - * lock - create a lock file for the named device - */ -int -lock(dev) - char *dev; -{ -#ifdef LOCKLIB - int result; - - result = mklock (dev, (void *) 0); - if (result == 0) { - strlcpy(lock_file, dev, sizeof(lock_file)); - return 0; - } - - if (result > 0) - notice("Device %s is locked by pid %d", dev, result); - else - error("Can't create lock file %s", lock_file); - return -1; - -#else /* LOCKLIB */ - - char lock_buffer[12]; - int fd, pid, n; - -#ifdef SVR4 - struct stat sbuf; - - if (stat(dev, &sbuf) < 0) { - error("Can't get device number for %s: %m", dev); - return -1; - } - if ((sbuf.st_mode & S_IFMT) != S_IFCHR) { - error("Can't lock %s: not a character device", dev); - return -1; - } - slprintf(lock_file, sizeof(lock_file), "%s/LK.%03d.%03d.%03d", - LOCK_DIR, major(sbuf.st_dev), - major(sbuf.st_rdev), minor(sbuf.st_rdev)); -#else - char *p; - char lockdev[MAXPATHLEN]; - - if ((p = strstr(dev, "dev/")) != NULL) { - dev = p + 4; - strncpy(lockdev, dev, MAXPATHLEN-1); - lockdev[MAXPATHLEN-1] = 0; - while ((p = strrchr(lockdev, '/')) != NULL) { - *p = '_'; - } - dev = lockdev; - } else - if ((p = strrchr(dev, '/')) != NULL) - dev = p + 1; - - slprintf(lock_file, sizeof(lock_file), "%s/LCK..%s", LOCK_DIR, dev); -#endif - - while ((fd = open(lock_file, O_EXCL | O_CREAT | O_RDWR, 0644)) < 0) { - if (errno != EEXIST) { - error("Can't create lock file %s: %m", lock_file); - break; - } - - /* Read the lock file to find out who has the device locked. */ - fd = open(lock_file, O_RDONLY, 0); - if (fd < 0) { - if (errno == ENOENT) /* This is just a timing problem. */ - continue; - error("Can't open existing lock file %s: %m", lock_file); - break; - } -#ifndef LOCK_BINARY - n = read(fd, lock_buffer, 11); -#else - n = read(fd, &pid, sizeof(pid)); -#endif /* LOCK_BINARY */ - close(fd); - fd = -1; - if (n <= 0) { - error("Can't read pid from lock file %s", lock_file); - break; - } - - /* See if the process still exists. */ -#ifndef LOCK_BINARY - lock_buffer[n] = 0; - pid = atoi(lock_buffer); -#endif /* LOCK_BINARY */ - if (pid == getpid()) - return 1; /* somebody else locked it for us */ - if (pid == 0 - || (kill(pid, 0) == -1 && errno == ESRCH)) { - if (unlink (lock_file) == 0) { - notice("Removed stale lock on %s (pid %d)", dev, pid); - continue; - } - warn("Couldn't remove stale lock on %s", dev); - } else - notice("Device %s is locked by pid %d", dev, pid); - break; - } - - if (fd < 0) { - lock_file[0] = 0; - return -1; - } - - pid = getpid(); -#ifndef LOCK_BINARY - slprintf(lock_buffer, sizeof(lock_buffer), "%10d\n", pid); - write (fd, lock_buffer, 11); -#else - write(fd, &pid, sizeof (pid)); -#endif - close(fd); - return 0; - -#endif -} - -/* - * relock - called to update our lockfile when we are about to detach, - * thus changing our pid (we fork, the child carries on, and the parent dies). - * Note that this is called by the parent, with pid equal to the pid - * of the child. This avoids a potential race which would exist if - * we had the child rewrite the lockfile (the parent might die first, - * and another process could think the lock was stale if it checked - * between when the parent died and the child rewrote the lockfile). - */ -int -relock(pid) - int pid; -{ -#ifdef LOCKLIB - /* XXX is there a way to do this? */ - return -1; -#else /* LOCKLIB */ - - int fd; - char lock_buffer[12]; - - if (lock_file[0] == 0) - return -1; - fd = open(lock_file, O_WRONLY, 0); - if (fd < 0) { - error("Couldn't reopen lock file %s: %m", lock_file); - lock_file[0] = 0; - return -1; - } - -#ifndef LOCK_BINARY - slprintf(lock_buffer, sizeof(lock_buffer), "%10d\n", pid); - write (fd, lock_buffer, 11); -#else - write(fd, &pid, sizeof(pid)); -#endif /* LOCK_BINARY */ - close(fd); - return 0; - -#endif /* LOCKLIB */ -} - -/* - * unlock - remove our lockfile - */ -void -unlock() -{ - if (lock_file[0]) { -#ifdef LOCKLIB - (void) rmlock(lock_file, (void *) 0); -#else - unlink(lock_file); -#endif - lock_file[0] = 0; - } -} - |