rand: use arc4random as fallback when available #10672
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Normally curl uses cryptographically strong random provided by the selected SSL backend. If compiled without SSL support, a naive built-in function was used instead. Generally this was okay, but it will result in some downsides for non- SSL builds, such as predictable temporary file names. This change ensures that arc4random will be used instead, if available.
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bagder
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Normally curl uses cryptographically strong random provided by the selected SSL backend. If compiled without SSL support, a naive built-in function was used instead. Generally this was okay, but it will result in some downsides for non- SSL builds, such as predictable temporary file names. This change ensures that arc4random will be used instead, if available. Closes curl#10672
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autotools unexpectedly detects `arc4random` because it is also looking
into dependency libs. One dependency, LibreSSL, happens to publish an
`arc4random` function (via its shared lib before v3.7, also via static
lib as of v3.8.2). When trying to use this function in `lib/rand.c`,
its protoype is missing. To fix that, curl included a prototype, but
that used a C99 type without including `stdint.h`, causing:
```
../../lib/rand.c:37:1: error: unknown type name 'uint32_t'
37 | uint32_t arc4random(void);
| ^
1 error generated.
```
This patch improves this by dropping the local prototype and instead
limiting `arc4random` use for non-OpenSSL builds. OpenSSL builds provide
their own random source anyway.
The better fix would be to teach autotools to not link dependency libs
while detecting `arc4random`.
LibreSSL publishing a non-namespaced `arc4random` tracked here:
libressl/portable#928
Regression from 755ddbe curl#10672
Fixes curl#12257
Closes #xxxxx
vszakats
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autotools unexpectedly detects `arc4random` because it is also looking
into dependency libs. One dependency, LibreSSL, happens to publish an
`arc4random` function (via its shared lib before v3.7, also via static
lib as of v3.8.2). When trying to use this function in `lib/rand.c`,
its protoype is missing. To fix that, curl included a prototype, but
that used a C99 type without including `stdint.h`, causing:
```
../../lib/rand.c:37:1: error: unknown type name 'uint32_t'
37 | uint32_t arc4random(void);
| ^
1 error generated.
```
This patch improves this by dropping the local prototype and instead
limiting `arc4random` use for non-OpenSSL builds. OpenSSL builds provide
their own random source anyway.
The better fix would be to teach autotools to not link dependency libs
while detecting `arc4random`.
LibreSSL publishing a non-namespaced `arc4random` tracked here:
libressl/portable#928
Regression from 755ddbe #10672
Reviewed-by: Daniel Stenberg
Fixes #12257
Closes #12274
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Normally curl uses cryptographically strong random provided by the selected SSL backend. If compiled without SSL support, a naive built-in function was used instead.
Generally this was okay, but it will result in some downsides for non- SSL builds, such as predictable temporary file names.
This change ensures that arc4random will be used instead, if available.