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Fix arm64 build: use c_char instead of i8 in FFI declarations

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On ARM64 Linux, c_char is u8 (unsigned), not i8 (signed).
Using the platform-correct std::ffi::c_char type fixes the
cross-compilation error.
This commit is contained in:
Graham McIntire 2026-02-10 08:40:15 -06:00
parent 7882e6b726
commit dba1c6a79c
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1 changed files with 18 additions and 18 deletions
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36
src/snmp/client.rs
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@ -1,6 +1,6 @@
use super::types::{SnmpError, SnmpResult, SnmpValue}; use super::types::{SnmpError, SnmpResult, SnmpValue};
use netsnmp_sys::*; use netsnmp_sys::*;
use std::ffi::{CStr, CString}; use std::ffi::{c_char, CStr, CString};
use std::ptr; use std::ptr;
use zeroize::{Zeroize, Zeroizing}; use zeroize::{Zeroize, Zeroizing};
@ -21,44 +21,44 @@ struct SnmpWalkResult {
#[repr(C)] #[repr(C)]
struct SnmpV3ConfigC { struct SnmpV3ConfigC {
username: *const i8, username: *const c_char,
auth_password: *const i8, auth_password: *const c_char,
priv_password: *const i8, priv_password: *const c_char,
auth_protocol: *const i8, auth_protocol: *const c_char,
priv_protocol: *const i8, priv_protocol: *const c_char,
security_level: *const i8, security_level: *const c_char,
} }
extern "C" { extern "C" {
fn snmp_init_library() -> i32; fn snmp_init_library() -> i32;
fn snmp_open_session( fn snmp_open_session(
ip_address: *const i8, ip_address: *const c_char,
port: u16, port: u16,
community: *const i8, community: *const c_char,
version: i32, version: i32,
timeout_us: i64, timeout_us: i64,
retries: i32, retries: i32,
v3_config: *const SnmpV3ConfigC, v3_config: *const SnmpV3ConfigC,
error_buf: *mut i8, error_buf: *mut c_char,
error_buf_len: usize, error_buf_len: usize,
) -> *mut std::ffi::c_void; ) -> *mut std::ffi::c_void;
fn snmp_close_session(sess_handle: *mut std::ffi::c_void); fn snmp_close_session(sess_handle: *mut std::ffi::c_void);
fn snmp_get( fn snmp_get(
sess_handle: *mut std::ffi::c_void, sess_handle: *mut std::ffi::c_void,
oid_str: *const i8, oid_str: *const c_char,
value_buf: *mut std::ffi::c_void, value_buf: *mut std::ffi::c_void,
value_buf_len: usize, value_buf_len: usize,
value_type: *mut i32, value_type: *mut i32,
error_buf: *mut i8, error_buf: *mut c_char,
error_buf_len: usize, error_buf_len: usize,
) -> i32; ) -> i32;
fn snmp_walk( fn snmp_walk(
sess_handle: *mut std::ffi::c_void, sess_handle: *mut std::ffi::c_void,
oid_str: *const i8, oid_str: *const c_char,
results: *mut SnmpWalkResult, results: *mut SnmpWalkResult,
max_results: usize, max_results: usize,
num_results: *mut usize, num_results: *mut usize,
error_buf: *mut i8, error_buf: *mut c_char,
error_buf_len: usize, error_buf_len: usize,
) -> i32; ) -> i32;
} }
@ -269,7 +269,7 @@ impl SnmpSession {
(None, None) (None, None)
}; };
let mut error_buf = [0i8; 512]; let mut error_buf = [0 as c_char; 512];
let sess_handle = snmp_open_session( let sess_handle = snmp_open_session(
ip_cstr.as_ptr(), ip_cstr.as_ptr(),
port, port,
@ -320,7 +320,7 @@ impl SnmpSession {
let mut value_buf = [0u8; 1024]; let mut value_buf = [0u8; 1024];
let mut value_type: i32 = 0; let mut value_type: i32 = 0;
let mut error_buf = [0i8; 512]; let mut error_buf = [0 as c_char; 512];
let result = snmp_get( let result = snmp_get(
self.sess_handle, self.sess_handle,
@ -429,7 +429,7 @@ impl SnmpSession {
]; ];
let mut num_results: usize = 0; let mut num_results: usize = 0;
let mut error_buf = [0i8; 512]; let mut error_buf = [0 as c_char; 512];
let result = snmp_walk( let result = snmp_walk(
self.sess_handle, self.sess_handle,
@ -455,7 +455,7 @@ impl SnmpSession {
let mut parsed_results = Vec::with_capacity(num_results); let mut parsed_results = Vec::with_capacity(num_results);
for res in results_buf.iter().take(num_results) { for res in results_buf.iter().take(num_results) {
// Parse OID string // Parse OID string
let oid_str = CStr::from_ptr(res.oid.as_ptr() as *const i8) let oid_str = CStr::from_ptr(res.oid.as_ptr() as *const c_char)
.to_string_lossy() .to_string_lossy()
.to_string(); .to_string();