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rc_getline keeps expanding it's malloced buffer until it has read a whole line or EOF. All functions which read into static buffers have been changed to use fhis function to avoid any potential overflows and to ensure we really do read a long long config line.

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This commit is contained in:
Roy Marples 2008-01-07 12:29:30 +00:00
parent 74e0e58b89
commit 43d0f3fc76
15 changed files with 114 additions and 172 deletions
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34
src/default.mk
View File

@ -1,34 +0,0 @@
# Copyright 2007-2008 Roy Marples
CC ?= gcc
AR ?= ar
RANLIB ?= ranlib
CFLAGS += -O2 -pipe
LDFLAGS += -L.
PICFLAG = -fPIC
# GNU Make way of detecting gcc flags we can use
check_gcc=$(shell if $(CC) $(1) -S -o /dev/null -xc /dev/null >/dev/null 2>&1; \
then echo "$(1)"; else echo "$(2)"; fi)
# pmake check for extra cflags
WEXTRA != for x in -Wdeclaration-after-statement -Wsequence-point -Wextra; do \
if $(CC) $$x -S -o /dev/null -xc /dev/null >/dev/null 2>&1; \
then echo -n "$$x "; fi \
done
# Loads of nice flags to ensure our code is good
CFLAGS += -pedantic -std=c99 \
-Wall -Wunused -Wimplicit -Wshadow -Wformat=2 \
-Wmissing-declarations -Wno-missing-prototypes -Wwrite-strings \
-Wbad-function-cast -Wnested-externs -Wcomment -Winline \
-Wchar-subscripts -Wcast-align -Wno-format-nonliteral \
$(call check_gcc, -Wdeclaration-after-statement) \
$(call check_gcc, -Wsequence-point) \
$(call check_gcc, -Wextra) $(WEXTRA)
# For debugging. -Werror is pointless due to ISO C issues with dlsym
#CFLAGS += -ggdb
TOPDIR = ..
include $(TOPDIR)/default.mk

41
src/librc/librc-daemon.c
View File

@ -265,7 +265,7 @@ static bool _match_daemon (const char *path, const char *file,
const char *mexec, const char *mname,
const char *mpidfile)
{
char *buffer;
char *line;
char *ffile = rc_strcatpaths (path, file, (char *) NULL);
FILE *fp;
int lc = 0;
@ -281,19 +281,14 @@ static bool _match_daemon (const char *path, const char *file,
if (! mpidfile)
m += 100;
buffer = xmalloc (sizeof (char) * RC_LINEBUFFER);
memset (buffer, 0, RC_LINEBUFFER);
while ((fgets (buffer, RC_LINEBUFFER, fp))) {
int lb = strlen (buffer) - 1;
if (buffer[lb] == '\n')
buffer[lb] = 0;
if (strcmp (buffer, mexec) == 0)
while ((line = rc_getline (fp))) {
if (strcmp (line, mexec) == 0)
m += 1;
else if (mname && strcmp (buffer, mname) == 0)
else if (mname && strcmp (line, mname) == 0)
m += 10;
else if (mpidfile && strcmp (buffer, mpidfile) == 0)
else if (mpidfile && strcmp (line, mpidfile) == 0)
m += 100;
free (line);
if (m == 111)
break;
@ -302,7 +297,6 @@ static bool _match_daemon (const char *path, const char *file,
if (lc > 5)
break;
}
free (buffer);
fclose (fp);
free (ffile);
@ -460,7 +454,7 @@ bool rc_service_daemons_crashed (const char *service)
struct dirent *d;
char *path;
FILE *fp;
char *buffer = NULL;
char *line;
char *exec = NULL;
char *name = NULL;
char *pidfile = NULL;
@ -481,9 +475,6 @@ bool rc_service_daemons_crashed (const char *service)
return (false);
}
buffer = xmalloc (sizeof (char) * RC_LINEBUFFER);
memset (buffer, 0, RC_LINEBUFFER);
while ((d = readdir (dp))) {
if (d->d_name[0] == '.')
continue;
@ -494,17 +485,17 @@ bool rc_service_daemons_crashed (const char *service)
if (! fp)
break;
while ((fgets (buffer, RC_LINEBUFFER, fp))) {
int lb = strlen (buffer) - 1;
if (buffer[lb] == '\n')
buffer[lb] = 0;
p = buffer;
if ((token = strsep (&p, "=")) == NULL || ! p)
while ((line = rc_getline (fp))) {
p = line;
if ((token = strsep (&p, "=")) == NULL || ! p) {
free (line);
continue;
}
if (strlen (p) == 0)
if (strlen (p) == 0) {
free (line);
continue;
}
if (strcmp (token, "exec") == 0) {
if (exec)
@ -519,6 +510,7 @@ bool rc_service_daemons_crashed (const char *service)
free (pidfile);
pidfile = xstrdup (p);
}
free (line);
}
fclose (fp);
@ -563,7 +555,6 @@ bool rc_service_daemons_crashed (const char *service)
name = NULL;
}
free (buffer);
free (exec);
free (name);
free (dirpath);

43
src/librc/librc-depend.c
View File

@ -124,7 +124,7 @@ rc_depinfo_t *rc_deptree_load (void)
rc_depinfo_t *deptree = NULL;
rc_depinfo_t *depinfo = NULL;
rc_deptype_t *deptype = NULL;
char buffer [RC_LINEBUFFER];
char *line;
char *type;
char *p;
char *e;
@ -133,26 +133,26 @@ rc_depinfo_t *rc_deptree_load (void)
if (! (fp = fopen (RC_DEPTREE, "r")))
return (NULL);
while (fgets (buffer, RC_LINEBUFFER, fp))
while ((line = rc_getline (fp)))
{
p = buffer;
p = line;
e = strsep (&p, "_");
if (! e || strcmp (e, "depinfo") != 0)
continue;
goto next;
e = strsep (&p, "_");
if (! e || sscanf (e, "%d", &i) != 1)
continue;
goto next;
if (! (type = strsep (&p, "_=")))
continue;
goto next;
if (strcmp (type, "service") == 0)
{
/* Sanity */
e = get_shell_value (p);
if (! e || strlen (e) == 0)
continue;
goto next;
if (! deptree)
{
@ -167,17 +167,17 @@ rc_depinfo_t *rc_deptree_load (void)
memset (depinfo, 0, sizeof (rc_depinfo_t));
depinfo->service = xstrdup (e);
deptype = NULL;
continue;
goto next;
}
e = strsep (&p, "=");
if (! e || sscanf (e, "%d", &i) != 1)
continue;
goto next;
/* Sanity */
e = get_shell_value (p);
if (! e || strlen (e) == 0)
continue;
goto next;
if (! deptype)
{
@ -197,6 +197,9 @@ rc_depinfo_t *rc_deptree_load (void)
deptype->type = xstrdup (type);
rc_strlist_addsort (&deptype->services, e);
next:
free (line);
}
fclose (fp);
@ -722,7 +725,7 @@ bool rc_deptree_update (void)
rc_deptype_t *deptype = NULL;
rc_deptype_t *dt;
rc_deptype_t *last_deptype = NULL;
char *buffer = NULL;
char *line;
int len;
int i;
int j;
@ -740,20 +743,14 @@ bool rc_deptree_update (void)
deptree = xmalloc (sizeof (rc_depinfo_t));
memset (deptree, 0, sizeof (rc_depinfo_t));
buffer = xmalloc (sizeof (char) * RC_LINEBUFFER);
memset (buffer, 0, RC_LINEBUFFER);
/* Phase 2 */
while (fgets (buffer, RC_LINEBUFFER, fp))
while ((line = rc_getline (fp)))
{
/* Trim the newline */
if (buffer[strlen (buffer) - 1] == '\n')
buffer[strlen(buffer) -1] = 0;
depends = buffer;
depends = line;
service = strsep (&depends, " ");
if (! service)
continue;
goto next;
type = strsep (&depends, " ");
for (depinfo = deptree; depinfo; depinfo = depinfo->next)
@ -778,7 +775,7 @@ bool rc_deptree_update (void)
/* We may not have any depends */
if (! type || ! depends)
continue;
goto next;
/* Get the type */
if (strcmp (type, "config") != 0) {
@ -844,9 +841,11 @@ bool rc_deptree_update (void)
rc_strlist_delete (&dt->services, depend);
}
}
next:
free (line);
}
pclose (fp);
free (buffer);
/* Phase 3 - add our providors to the tree */
for (depinfo = deptree; depinfo; depinfo = depinfo->next)

42
src/librc/librc-misc.c
View File

@ -105,6 +105,30 @@ char *rc_strcatpaths (const char *path1, const char *paths, ...)
}
librc_hidden_def(rc_strcatpaths)
char *rc_getline (FILE *fp)
{
char *line = NULL;
size_t len = 0;
size_t last = 0;
if (feof (fp))
return (NULL);
do {
len += BUFSIZ;
line = xrealloc (line, sizeof (char) * len);
fgets (line + last, BUFSIZ, fp);
last = strlen (line + last) - 1;
} while (! feof (fp) && line[last] != '\n');
/* Trim the trailing newline */
if (line[last] == '\n')
line[last] = '\0';
return (line);
}
librc_hidden_def(rc_getline)
char **rc_config_list (const char *file)
{
FILE *fp;
@ -112,26 +136,12 @@ char **rc_config_list (const char *file)
char *p;
char *token;
char **list = NULL;
size_t buflen = BUFSIZ;
size_t last;
if (! (fp = fopen (file, "r")))
return (NULL);
buffer = xmalloc (sizeof (char) * buflen);
buffer[buflen - 1] = '\0';
while (fgets (buffer, buflen, fp)) {
/* Increase the buffer to read the rest of the line if needed */
last = strlen (buffer) - 1;
while (! feof (fp) && buffer[last] != '\n') {
buflen += BUFSIZ;
buffer = xrealloc (buffer, sizeof (char *) * buflen);
fgets (buffer + last, BUFSIZ, fp);
last = strlen (buffer) - 1;
}
while ((p = buffer = rc_getline (fp))) {
/* Strip leading spaces/tabs */
p = buffer;
while ((*p == ' ') || (*p == '\t'))
p++;
@ -144,8 +154,8 @@ char **rc_config_list (const char *file)
rc_strlist_add (&list, token);
}
}
free (buffer);
}
fclose (fp);
return (list);

39
src/librc/librc.c
View File

@ -307,7 +307,7 @@ char **rc_service_extra_commands (const char *service)
char *buffer = NULL;
char **commands = NULL;
char *token;
char *p = buffer;
char *p;
FILE *fp;
int l;
@ -319,13 +319,9 @@ char **rc_service_extra_commands (const char *service)
snprintf (cmd, l, OPTSTR, svc);
free (svc);
if ((fp = popen (cmd, "r"))) {
buffer = xmalloc (sizeof (char) * RC_LINEBUFFER);
if (fgets (buffer, RC_LINEBUFFER, fp)) {
if (buffer[strlen (buffer) - 1] == '\n')
buffer[strlen (buffer) - 1] = '\0';
p = buffer = rc_getline (fp);
while ((token = strsep (&p, " ")))
rc_strlist_addsort (&commands, token);
}
pclose (fp);
free (buffer);
}
@ -338,12 +334,10 @@ librc_hidden_def(rc_service_extra_commands)
char *rc_service_description (const char *service, const char *option)
{
char *svc;
char *cmd = NULL;
char *buffer;
char *cmd;
char *desc = NULL;
FILE *fp;
int i;
int l;
if (! (svc = rc_service_resolve (service)))
return (NULL);
@ -351,24 +345,12 @@ char *rc_service_description (const char *service, const char *option)
if (! option)
option = "";
l = strlen (DESCSTR) + strlen (svc) + strlen (option) + 2;
cmd = xmalloc (sizeof (char) * l);
snprintf (cmd, l, DESCSTR, svc, option ? "_" : "", option);
i = strlen (DESCSTR) + strlen (svc) + strlen (option) + 2;
cmd = xmalloc (sizeof (char) * i);
snprintf (cmd, i, DESCSTR, svc, option ? "_" : "", option);
free (svc);
if ((fp = popen (cmd, "r"))) {
buffer = xmalloc (sizeof (char) * RC_LINEBUFFER);
while (fgets (buffer, RC_LINEBUFFER, fp)) {
if (! desc) {
desc = xmalloc (strlen (buffer) + 1);
*desc = '\0';
} else {
desc = xrealloc (desc, strlen (desc) + strlen (buffer) + 1);
}
i = strlen (desc);
memcpy (desc + i, buffer, strlen (buffer));
memset (desc + i + strlen (buffer), 0, 1);
}
free (buffer);
desc = rc_getline (fp);
pclose (fp);
}
free (cmd);
@ -547,18 +529,17 @@ librc_hidden_def(rc_service_state)
char *rc_service_value_get (const char *service, const char *option)
{
FILE *fp;
char *buffer = NULL;
char *line = NULL;
char *file = rc_strcatpaths (RC_SVCDIR, "options", service, option,
(char *) NULL);
if ((fp = fopen (file, "r"))) {
buffer = xmalloc (sizeof (char) * RC_LINEBUFFER);
fgets (buffer, RC_LINEBUFFER, fp);
line = rc_getline (fp);
fclose (fp);
}
free (file);
return (buffer);
return (line);
}
librc_hidden_def(rc_service_value_get)

1
src/librc/librc.h
View File

@ -83,6 +83,7 @@ librc_hidden_proto(rc_deptree_order)
librc_hidden_proto(rc_deptree_update)
librc_hidden_proto(rc_deptree_update_needed)
librc_hidden_proto(rc_find_pids)
librc_hidden_proto(rc_getline)
librc_hidden_proto(rc_runlevel_exists)
librc_hidden_proto(rc_runlevel_get)
librc_hidden_proto(rc_runlevel_list)

4
src/librc/rc.h
View File

@ -39,6 +39,7 @@
#include <sys/types.h>
#include <stdbool.h>
#include <stdio.h>
/*! @name Reserved runlevel names */
#define RC_LEVEL_SYSINIT "sysinit"
@ -347,6 +348,9 @@ extern FILE *rc_environ_fd;
/*! @name Configuration
* These functions help to deal with shell based configuration files */
/*! Return a line from a file, stripping the trailing newline. */
char *rc_getline (FILE *fp);
/*! Return a NULL terminated list of non comment lines from a file. */
char **rc_config_list (const char *file);

1
src/librc/rc.map
View File

@ -12,6 +12,7 @@ global:
rc_deptree_update_needed;
rc_environ_fd;
rc_find_pids;
rc_getline;
rc_runlevel_exists;
rc_runlevel_get;
rc_runlevel_list;

3
src/rc-misc.h
View File

@ -65,9 +65,6 @@
#define RC_PLUGINDIR RC_LIBDIR "/plugins"
/* Max buffer to read a line from a file */
#define RC_LINEBUFFER 4096
#define ERRX fprintf (stderr, "out of memory\n"); exit (1)
static inline void *xmalloc (size_t size)

10
src/rc/rc-logger.c
View File

@ -181,12 +181,12 @@ void rc_logger_open (const char *level)
write_time (log, "started");
else {
free (logbuf);
logbuf_size = RC_LINEBUFFER * 10;
logbuf_size = BUFSIZ * 10;
logbuf = xmalloc (sizeof (char) * logbuf_size);
logbuf_len = 0;
}
buffer = xmalloc (sizeof (char) * RC_LINEBUFFER);
buffer = xmalloc (sizeof (char) * BUFSIZ);
selfd = rc_logger_tty > signal_pipe[0] ? rc_logger_tty : signal_pipe[0];
while (1) {
FD_ZERO (&rset);
@ -200,15 +200,15 @@ void rc_logger_open (const char *level)
if (s > 0) {
if (FD_ISSET (rc_logger_tty, &rset)) {
memset (buffer, 0, RC_LINEBUFFER);
bytes = read (rc_logger_tty, buffer, RC_LINEBUFFER);
memset (buffer, 0, BUFSIZ);
bytes = read (rc_logger_tty, buffer, BUFSIZ);
write (STDOUT_FILENO, buffer, bytes);
if (log)
write_log (fileno (log), buffer, bytes);
else {
if (logbuf_size - logbuf_len < bytes) {
logbuf_size += RC_LINEBUFFER * 10;
logbuf_size += BUFSIZ * 10;
logbuf = xrealloc (logbuf, sizeof (char ) *
logbuf_size);
}

19
src/rc/rc-misc.c
View File

@ -238,7 +238,7 @@ char **env_filter (void)
static bool file_regex (const char *file, const char *regex)
{
FILE *fp;
char *buffer;
char *line;
regex_t re;
bool retval = false;
int result;
@ -246,23 +246,22 @@ static bool file_regex (const char *file, const char *regex)
if (! (fp = fopen (file, "r")))
return (false);
buffer = xmalloc (sizeof (char) * RC_LINEBUFFER);
if ((result = regcomp (&re, regex, REG_EXTENDED | REG_NOSUB)) != 0) {
fclose (fp);
regerror (result, &re, buffer, RC_LINEBUFFER);
fprintf (stderr, "file_regex: %s", buffer);
free (buffer);
line = xmalloc (sizeof (char) * BUFSIZ);
regerror (result, &re, line, BUFSIZ);
fprintf (stderr, "file_regex: %s", line);
free (line);
return (false);
}
while (fgets (buffer, RC_LINEBUFFER, fp)) {
if (regexec (&re, buffer, 0, NULL, 0) == 0)
{
while ((line = rc_getline (fp))) {
if (regexec (&re, line, 0, NULL, 0) == 0)
retval = true;
free (line);
if (retval)
break;
}
}
free (buffer);
fclose (fp);
regfree (&re);

6
src/rc/rc-plugin.c
View File

@ -197,10 +197,10 @@ void rc_plugin_run (rc_hook_t hook, const char *value)
ssize_t nr;
close (pfd[1]);
buffer = xmalloc (sizeof (char) * RC_LINEBUFFER);
memset (buffer, 0, RC_LINEBUFFER);
buffer = xmalloc (sizeof (char) * BUFSIZ);
memset (buffer, 0, BUFSIZ);
while ((nr = read (pfd[0], buffer, RC_LINEBUFFER)) > 0) {
while ((nr = read (pfd[0], buffer, BUFSIZ)) > 0) {
p = buffer;
while (*p && p - buffer < nr) {
token = strsep (&p, "=");

19
src/rc/rc.c
View File

@ -479,7 +479,7 @@ static int do_shell_var (int argc, char **argv)
static char *proc_getent (const char *ent)
{
FILE *fp;
char *buffer;
char *proc;
char *p;
char *value = NULL;
int i;
@ -492,18 +492,11 @@ static char *proc_getent (const char *ent)
return (NULL);
}
buffer = xmalloc (sizeof (char) * RC_LINEBUFFER);
memset (buffer, 0, RC_LINEBUFFER);
if (fgets (buffer, RC_LINEBUFFER, fp) &&
(p = strstr (buffer, ent)))
if ((proc = rc_getline (fp)) &&
(p = strstr (proc, ent)))
{
i = p - buffer;
if (i == '\0' || buffer[i - 1] == ' ') {
/* Trim the trailing carriage return if present */
i = strlen (buffer) - 1;
if (buffer[i] == '\n')
buffer[i] = 0;
i = p - proc;
if (i == '\0' || proc[i - 1] == ' ') {
p += strlen (ent);
if (*p == '=')
p++;
@ -511,7 +504,7 @@ static char *proc_getent (const char *ent)
}
} else
errno = ENOENT;
free (buffer);
free (proc);
fclose (fp);
return (value);

4
src/rc/runscript.c
View File

@ -451,7 +451,7 @@ static bool svc_exec (const char *arg1, const char *arg2)
}
selfd = MAX (master_tty, signal_pipe[0]) + 1;
buffer = xmalloc (sizeof (char) * RC_LINEBUFFER);
buffer = xmalloc (sizeof (char) * BUFSIZ);
while (1) {
FD_ZERO (&rset);
FD_SET (signal_pipe[0], &rset);
@ -467,7 +467,7 @@ static bool svc_exec (const char *arg1, const char *arg2)
if (s > 0) {
if (master_tty >= 0 && FD_ISSET (master_tty, &rset)) {
bytes = read (master_tty, buffer, RC_LINEBUFFER);
bytes = read (master_tty, buffer, BUFSIZ);
write_prefix (buffer, bytes, &prefixed);
}