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Replace strcat, strcpy and snprintf with bounds checking versions

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This commit is contained in:
Stefan Eßer 2020-12-31 12:37:37 +01:00
parent 80062279f7
commit a3c29cdbd4
1 changed files with 48 additions and 46 deletions
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94
usr.bin/calendar/parsedata.c
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@ -39,6 +39,8 @@ __FBSDID("$FreeBSD$");
#include "calendar.h" #include "calendar.h"
#define SLEN 100 /* maximum length of date spec. part strings */
static char *showflags(int flags); static char *showflags(int flags);
static int isonlydigits(char *s, int nostar); static int isonlydigits(char *s, int nostar);
static const char *getmonthname(int i); static const char *getmonthname(int i);
@ -116,12 +118,12 @@ determinestyle(char *date, int *flags,
*flags |= type; \ *flags |= type; \
*flags |= F_VARIABLE; \ *flags |= F_VARIABLE; \
if (strlen(s1) == lens2) { \ if (strlen(s1) == lens2) { \
strcpy(specialday, s1); \ strlcpy(specialday, s1, SLEN); \
return (1); \ return (1); \
} \ } \
strncpy(specialday, s1, lens2); \ strncpy(specialday, s1, lens2); \
specialday[lens2] = '\0'; \ specialday[lens2] = '\0'; \
strcpy(modifieroffset, s1 + lens2); \ strlcpy(modifieroffset, s1 + lens2, SLEN); \
*flags |= F_MODIFIEROFFSET; \ *flags |= F_MODIFIEROFFSET; \
return (1); \ return (1); \
} }
@ -166,12 +168,12 @@ determinestyle(char *date, int *flags,
*flags |= F_VARIABLE; *flags |= F_VARIABLE;
*idayofweek = offset; *idayofweek = offset;
if (strlen(date) == len) { if (strlen(date) == len) {
strcpy(dayofweek, date); strlcpy(dayofweek, date, SLEN);
return (1); return (1);
} }
strncpy(dayofweek, date, len); strncpy(dayofweek, date, len);
dayofweek[len] = '\0'; dayofweek[len] = '\0';
strcpy(modifierindex, date + len); strlcpy(modifierindex, date + len, SLEN);
*flags |= F_MODIFIERINDEX; *flags |= F_MODIFIERINDEX;
return (1); return (1);
} }
@ -179,7 +181,7 @@ determinestyle(char *date, int *flags,
/* Assume month number only */ /* Assume month number only */
*flags |= F_MONTH; *flags |= F_MONTH;
*imonth = (int)strtol(date, (char **)NULL, 10); *imonth = (int)strtol(date, (char **)NULL, 10);
strcpy(month, getmonthname(*imonth)); strlcpy(month, getmonthname(*imonth), SLEN);
return(1); return(1);
} }
return (0); return (0);
@ -198,7 +200,7 @@ determinestyle(char *date, int *flags,
if ((py = strchr(p2, '/')) != NULL) { if ((py = strchr(p2, '/')) != NULL) {
/* We have a year in the string. Now this is getting tricky */ /* We have a year in the string. Now this is getting tricky */
strcpy(year, p1); strlcpy(year, p1, SLEN);
*iyear = (int)strtol(year, NULL, 10); *iyear = (int)strtol(year, NULL, 10);
p1 = p2; p1 = p2;
p2 = py + 1; p2 = py + 1;
@ -213,9 +215,9 @@ determinestyle(char *date, int *flags,
*flags |= F_MONTH; *flags |= F_MONTH;
*imonth = offset; *imonth = offset;
strcpy(month, getmonthname(offset)); strlcpy(month, getmonthname(offset), SLEN);
if (isonlydigits(p2, 1)) { if (isonlydigits(p2, 1)) {
strcpy(dayofmonth, p2); strlcpy(dayofmonth, p2, SLEN);
*idayofmonth = (int)strtol(p2, (char **)NULL, 10); *idayofmonth = (int)strtol(p2, (char **)NULL, 10);
*flags |= F_DAYOFMONTH; *flags |= F_DAYOFMONTH;
goto allfine; goto allfine;
@ -229,10 +231,10 @@ determinestyle(char *date, int *flags,
*flags |= F_DAYOFWEEK; *flags |= F_DAYOFWEEK;
*flags |= F_VARIABLE; *flags |= F_VARIABLE;
*idayofweek = offset; *idayofweek = offset;
strcpy(dayofweek, getdayofweekname(offset)); strlcpy(dayofweek, getdayofweekname(offset), SLEN);
if (strlen(p2) == len) if (strlen(p2) == len)
goto allfine; goto allfine;
strcpy(modifierindex, p2 + len); strlcpy(modifierindex, p2 + len, SLEN);
*flags |= F_MODIFIERINDEX; *flags |= F_MODIFIERINDEX;
goto allfine; goto allfine;
} }
@ -248,7 +250,7 @@ determinestyle(char *date, int *flags,
*flags |= F_DAYOFMONTH; *flags |= F_DAYOFMONTH;
d = (int)strtol(p2, (char **)NULL, 10); d = (int)strtol(p2, (char **)NULL, 10);
*idayofmonth = d; *idayofmonth = d;
sprintf(dayofmonth, "%d", d); snprintf(dayofmonth, SLEN, "%d", d);
goto allfine; goto allfine;
} }
@ -264,12 +266,12 @@ determinestyle(char *date, int *flags,
*idayofweek = offset; *idayofweek = offset;
d = (int)strtol(p1, (char **)NULL, 10); d = (int)strtol(p1, (char **)NULL, 10);
*imonth = d; *imonth = d;
strcpy(month, getmonthname(d)); strlcpy(month, getmonthname(d), SLEN);
strcpy(dayofweek, getdayofweekname(offset)); strlcpy(dayofweek, getdayofweekname(offset), SLEN);
if (strlen(p2) == len) if (strlen(p2) == len)
goto allfine; goto allfine;
strcpy(modifierindex, p2 + len); strlcpy(modifierindex, p2 + len, SLEN);
*flags |= F_MODIFIERINDEX; *flags |= F_MODIFIERINDEX;
goto allfine; goto allfine;
} }
@ -291,13 +293,13 @@ determinestyle(char *date, int *flags,
if (m > 12) { if (m > 12) {
*imonth = d; *imonth = d;
*idayofmonth = m; *idayofmonth = m;
strcpy(month, getmonthname(d)); strlcpy(month, getmonthname(d), SLEN);
sprintf(dayofmonth, "%d", m); snprintf(dayofmonth, SLEN, "%d", m);
} else { } else {
*imonth = m; *imonth = m;
*idayofmonth = d; *idayofmonth = d;
strcpy(month, getmonthname(m)); strlcpy(month, getmonthname(m), SLEN);
sprintf(dayofmonth, "%d", d); snprintf(dayofmonth, SLEN, "%d", d);
} }
goto allfine; goto allfine;
} }
@ -328,7 +330,7 @@ remember(int *rememberindex, int *y, int *m, int *d, char **ed, int yy, int mm,
m[*rememberindex] = mm; m[*rememberindex] = mm;
d[*rememberindex] = dd; d[*rememberindex] = dd;
if (extra != NULL) if (extra != NULL)
strcpy(ed[*rememberindex], extra); strlcpy(ed[*rememberindex], extra, SLEN);
else else
ed[*rememberindex][0] = '\0'; ed[*rememberindex][0] = '\0';
*rememberindex += 1; *rememberindex += 1;
@ -431,9 +433,9 @@ int
parsedaymonth(char *date, int *yearp, int *monthp, int *dayp, int *flags, parsedaymonth(char *date, int *yearp, int *monthp, int *dayp, int *flags,
char **edp) char **edp)
{ {
char month[100], dayofmonth[100], dayofweek[100], modifieroffset[100]; char month[SLEN], dayofmonth[SLEN], dayofweek[SLEN], modifieroffset[SLEN];
char syear[100]; char syear[SLEN];
char modifierindex[100], specialday[100]; char modifierindex[SLEN], specialday[SLEN];
int idayofweek = -1, imonth = -1, idayofmonth = -1, iyear = -1; int idayofweek = -1, imonth = -1, idayofmonth = -1, iyear = -1;
int year, remindex; int year, remindex;
int d, m, dow, rm, rd, offset; int d, m, dow, rm, rd, offset;
@ -821,47 +823,47 @@ parsedaymonth(char *date, int *yearp, int *monthp, int *dayp, int *flags,
static char * static char *
showflags(int flags) showflags(int flags)
{ {
static char s[1000]; static char s[SLEN];
s[0] = '\0'; s[0] = '\0';
if ((flags & F_YEAR) != 0) if ((flags & F_YEAR) != 0)
strcat(s, "year "); strlcat(s, "year ", SLEN);
if ((flags & F_MONTH) != 0) if ((flags & F_MONTH) != 0)
strcat(s, "month "); strlcat(s, "month ", SLEN);
if ((flags & F_DAYOFWEEK) != 0) if ((flags & F_DAYOFWEEK) != 0)
strcat(s, "dayofweek "); strlcat(s, "dayofweek ", SLEN);
if ((flags & F_DAYOFMONTH) != 0) if ((flags & F_DAYOFMONTH) != 0)
strcat(s, "dayofmonth "); strlcat(s, "dayofmonth ", SLEN);
if ((flags & F_MODIFIERINDEX) != 0) if ((flags & F_MODIFIERINDEX) != 0)
strcat(s, "modifierindex "); strlcat(s, "modifierindex ", SLEN);
if ((flags & F_MODIFIEROFFSET) != 0) if ((flags & F_MODIFIEROFFSET) != 0)
strcat(s, "modifieroffset "); strlcat(s, "modifieroffset ", SLEN);
if ((flags & F_SPECIALDAY) != 0) if ((flags & F_SPECIALDAY) != 0)
strcat(s, "specialday "); strlcat(s, "specialday ", SLEN);
if ((flags & F_ALLMONTH) != 0) if ((flags & F_ALLMONTH) != 0)
strcat(s, "allmonth "); strlcat(s, "allmonth ", SLEN);
if ((flags & F_ALLDAY) != 0) if ((flags & F_ALLDAY) != 0)
strcat(s, "allday "); strlcat(s, "allday ", SLEN);
if ((flags & F_VARIABLE) != 0) if ((flags & F_VARIABLE) != 0)
strcat(s, "variable "); strlcat(s, "variable ", SLEN);
if ((flags & F_CNY) != 0) if ((flags & F_CNY) != 0)
strcat(s, "chinesenewyear "); strlcat(s, "chinesenewyear ", SLEN);
if ((flags & F_PASKHA) != 0) if ((flags & F_PASKHA) != 0)
strcat(s, "paskha "); strlcat(s, "paskha ", SLEN);
if ((flags & F_EASTER) != 0) if ((flags & F_EASTER) != 0)
strcat(s, "easter "); strlcat(s, "easter ", SLEN);
if ((flags & F_FULLMOON) != 0) if ((flags & F_FULLMOON) != 0)
strcat(s, "fullmoon "); strlcat(s, "fullmoon ", SLEN);
if ((flags & F_NEWMOON) != 0) if ((flags & F_NEWMOON) != 0)
strcat(s, "newmoon "); strlcat(s, "newmoon ", SLEN);
if ((flags & F_MAREQUINOX) != 0) if ((flags & F_MAREQUINOX) != 0)
strcat(s, "marequinox "); strlcat(s, "marequinox ", SLEN);
if ((flags & F_SEPEQUINOX) != 0) if ((flags & F_SEPEQUINOX) != 0)
strcat(s, "sepequinox "); strlcat(s, "sepequinox ", SLEN);
if ((flags & F_JUNSOLSTICE) != 0) if ((flags & F_JUNSOLSTICE) != 0)
strcat(s, "junsolstice "); strlcat(s, "junsolstice ", SLEN);
if ((flags & F_DECSOLSTICE) != 0) if ((flags & F_DECSOLSTICE) != 0)
strcat(s, "decsolstice "); strlcat(s, "decsolstice ", SLEN);
return s; return s;
} }
@ -1026,7 +1028,7 @@ parseoffset(char *s)
static char * static char *
floattotime(double f) floattotime(double f)
{ {
static char buf[100]; static char buf[SLEN];
int hh, mm, ss, i; int hh, mm, ss, i;
f -= floor(f); f -= floor(f);
@ -1038,14 +1040,14 @@ floattotime(double f)
i %= SECSPERMINUTE; i %= SECSPERMINUTE;
ss = i; ss = i;
sprintf(buf, "%02d:%02d:%02d", hh, mm, ss); snprintf(buf, SLEN, "%02d:%02d:%02d", hh, mm, ss);
return (buf); return (buf);
} }
static char * static char *
floattoday(int year, double f) floattoday(int year, double f)
{ {
static char buf[100]; static char buf[SLEN];
int i, m, d, hh, mm, ss; int i, m, d, hh, mm, ss;
int *cumdays = cumdaytab[isleap(year)]; int *cumdays = cumdaytab[isleap(year)];
@ -1062,7 +1064,7 @@ floattoday(int year, double f)
i %= SECSPERMINUTE; i %= SECSPERMINUTE;
ss = i; ss = i;
sprintf(buf, "%02d-%02d %02d:%02d:%02d", m, d, hh, mm, ss); snprintf(buf, SLEN, "%02d-%02d %02d:%02d:%02d", m, d, hh, mm, ss);
return (buf); return (buf);
} }