forked from Telodendria/Telodendria
Add random string generator
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6 changed files with 56 additions and 2 deletions
2
TODO.txt
2
TODO.txt
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@ -12,7 +12,7 @@ Milestone: v0.1.1
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-----------------
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[x] DbDelete()
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[ ] UtilRandomString()
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[x] UtilRandomString()
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[ ] Database version file
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[ ] User registration
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@ -1,4 +1,4 @@
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.Dd $Mdocdate: November 26 2022 $
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.Dd $Mdocdate: December 15 2022 $
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.Dt UTIL 3
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.Os Telodendria Project
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.Sh NAME
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@ -26,6 +26,8 @@
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.Fn UtilGetDelim "char **" "size_t *" "int" "FILE *"
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.Ft ssize_t
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.Fn UtilGetLine "char **" "size_t *" "FILE *"
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.Ft char *
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.Fn UtilRandomString "size_t"
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.Sh DESCRIPTION
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.Pp
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This header holds a number of random functions related to strings,
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@ -98,6 +100,12 @@ work identically to the POSIX equivalents, documented in
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.Xr getdelim 3 ,
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except it assumes pointers were allocated using the Memory API, and it
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uses the Memory API itself to reallocate necessary pointers.
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.Pp
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.Fn UtilRandomString
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generates a random string of the given length. At the moment, it only
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selects from uppercase and lowercase numbers, but the character set may
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be expanded in the future, or a function may be added to specify an
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arbitrary character set.
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.Sh RETURN VALUES
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.Pp
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.Fn UtilServerTs
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@ -131,3 +139,7 @@ and
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.Fn UtilGetLine
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return the same value as their POSIX equivalents, documented in
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.Xr getdelim 3 .
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.Pp
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.Fn UtilRandomString
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returns a string, allocated on the heap, of the given length, or NULL if there
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was an error allocating memory.
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@ -43,6 +43,12 @@ While the database is for persistent storage, there may
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be some ephemeral data that lives there only for a short
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while, so it will be necessary to remove that data when
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necessary.
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.It
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Added a thread-safe random string generator, which will
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be used extensively for generating session tokens, device
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IDs, access tokens, and more. This generator is seeded by
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the current timestamp and the thread ID, so it should be
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fairly random.
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.El
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.Pp
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Bug fixes:
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@ -75,6 +75,7 @@ ROUTE_IMPL(RouteRegister, args)
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HashMapSet(response, "flows", JsonValueArray(flows));
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HashMapSet(response, "params", JsonValueObject(HashMapCreate()));
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HashMapSet(response, "session", JsonValueString(UtilRandomString(24)));
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}
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else
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{
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32
src/Util.c
32
src/Util.c
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@ -36,6 +36,7 @@
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#include <sys/time.h>
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#include <sys/stat.h>
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#include <limits.h>
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#include <pthread.h>
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#ifndef PATH_MAX
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#define PATH_MAX 256
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@ -394,3 +395,34 @@ UtilGetLine(char **linePtr, size_t * n, FILE * stream)
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{
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return UtilGetDelim(linePtr, n, '\n', stream);
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}
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char *
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UtilRandomString(size_t len)
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{
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static const char charset[] =
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"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
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char *str;
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size_t i;
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unsigned int seed = UtilServerTs() * (unsigned long) pthread_self();
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if (!len)
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{
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return NULL;
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}
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str = Malloc(len + 1);
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if (!str)
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{
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return NULL;
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}
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for (i = 0; i < len; i++)
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{
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str[i] = charset[rand_r(&seed) % (sizeof(charset) - 1)];
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}
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str[len] = '\0';
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return str;
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}
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@ -59,4 +59,7 @@ extern ssize_t
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extern ssize_t
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UtilGetLine(char **, size_t *, FILE *);
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extern char *
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UtilRandomString(size_t);
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#endif /* TELODENDRIA_UTIL_H */
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